WO2022196039A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- WO2022196039A1 WO2022196039A1 PCT/JP2022/000159 JP2022000159W WO2022196039A1 WO 2022196039 A1 WO2022196039 A1 WO 2022196039A1 JP 2022000159 W JP2022000159 W JP 2022000159W WO 2022196039 A1 WO2022196039 A1 WO 2022196039A1
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- positive electrode
- secondary battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/366—Composites as layered products
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present disclosure relates to non-aqueous electrolyte secondary batteries.
- Patent Document 1 discloses a secondary battery in which current collecting members are arranged above and below an electrode body from which a plurality of tabs protrude, thereby improving the output characteristics of the battery and suppressing the cost of the current collecting members.
- Patent Document 1 describes a lithium-containing composite oxide containing two or more elements selected from Co, Ni, and Mn as a positive electrode active material.
- Patent Document 1 discloses a positive electrode active material containing Ni, Mn, and Co.
- the Ni content is increased in order to obtain a high battery capacity.
- a design is conceivable in which the Co content is lowered to reduce the manufacturing cost.
- the secondary battery using a lithium-containing composite oxide containing a high Ni content that does not substantially contain Co has an increased battery resistance and reduced output characteristics. I have something to do.
- the technique of Patent Document 1 does not take into account both suppression of battery resistance and suppression of cost, and there is still room for improvement.
- an object of the present disclosure is to provide a non-aqueous electrolyte secondary battery with improved output characteristics while suppressing costs.
- a non-aqueous electrolyte secondary battery includes an electrode body in which a strip-shaped positive electrode and a strip-shaped negative electrode are wound with a separator interposed therebetween; A cylindrical exterior body with a bottom of 25 mm or more and a sealing body that seals an opening at the upper end of the exterior body and is connected to the positive electrode, and the positive electrode is a positive electrode current collector and the surface of the positive electrode current collector and a positive electrode mixture layer containing a positive electrode active material and a conductive agent, the positive electrode active material including a lithium-containing composite oxide, the lithium-containing composite oxide having a layered rock salt structure, containing Co
- the lithium-containing composite oxide does not contain substantially but contains at least Ni and Mn, and the content of Ni in the lithium-containing composite oxide is 70 mol% or more with respect to the total number of moles of the metal elements excluding Li, and the positive electrode mixture
- the basis weight of the layer is 250 g/m 2 or more, and the electrode assembly is characterized in that three or more
- a non-aqueous electrolyte secondary battery includes an electrode body in which a strip-shaped positive electrode and a strip-shaped negative electrode are wound with a separator interposed therebetween; A cylindrical exterior body with a bottom of 25 mm or more and a sealing body that seals an opening at the upper end of the exterior body and is connected to the positive electrode, and the positive electrode is a positive electrode current collector and the surface of the positive electrode current collector and a positive electrode mixture layer containing a positive electrode active material and a conductive agent, the positive electrode active material including a lithium-containing composite oxide, the lithium-containing composite oxide having a layered rock salt structure, containing Co
- the lithium-containing composite oxide does not contain substantially but contains at least Ni and Mn, and the content of Ni in the lithium-containing composite oxide is 70 mol% or more with respect to the total number of moles of the metal elements excluding Li, and the positive electrode mixture
- the basis weight of the layer is 250 g/m 2 or more, the positive electrode protruding above the negative electrode and
- non-aqueous electrolyte secondary battery which is one aspect of the present disclosure, it is possible to achieve both improvement in output characteristics and cost reduction.
- FIG. 1 is a vertical cross-sectional view of a non-aqueous electrolyte secondary battery that is an example of an embodiment
- FIG. FIG. 2 is a front view showing, in an unfolded state, a positive electrode and a negative electrode that constitute an electrode assembly included in the non-aqueous electrolyte secondary battery of FIG. 1
- FIG. 2 is a plan view showing positions where positive leads are arranged on the upper surface of an electrode body, (a) showing an example in which positive leads are arranged in a substantially straight line in the radial direction, and (b) showing an example in which positive leads are arranged at substantially equal angles;
- FIG. 1 is a vertical cross-sectional view of a non-aqueous electrolyte secondary battery that is an example of an embodiment
- FIG. FIG. 2 is a front view showing, in an unfolded state, a positive electrode and a negative electrode that constitute an electrode assembly included in the non-aqueous electrolyte secondary battery of FIG. 1
- FIG. 2 is a
- FIG. 3 is a vertical cross-sectional view of a non-aqueous electrolyte secondary battery that is another example of an embodiment
- FIG. 4 is a perspective view of an electrode body included in the nonaqueous electrolyte secondary battery of FIG. 3 , showing the configuration of a positive electrode, a negative electrode, and a separator in a state where the vicinity of the winding outer end portion is unfolded;
- the lithium-containing composite oxide there are a transition metal layer such as Ni, a Li layer, and an oxygen layer. proceed.
- a transition metal layer such as Ni
- a Li layer In the layered rock salt structure of the lithium-containing composite oxide, there are a transition metal layer such as Ni, a Li layer, and an oxygen layer. proceed.
- the Ni content is increased from the viewpoint of high capacity, and the Co content is decreased from the viewpoint of cost reduction, the electronic conductivity of the lithium-containing composite oxide itself is lowered, so that the battery can be used.
- the resistance may increase and the output characteristics may deteriorate.
- the present inventors have found that while adjusting the composition of the lithium-containing composite oxide, the outer diameter of the battery is set to 25 mm or more, the basis weight of the positive electrode mixture layer is set to 250 g/m 2 or more, and the positive electrode and the sealing member are combined.
- the cost means the cost per unit battery capacity when producing the secondary battery.
- FIG. 1 An example of an embodiment of the non-aqueous electrolyte secondary battery according to the present disclosure will be described in detail below with reference to FIGS. 1 to 3.
- FIG. 1 specific shapes, materials, numerical values, directions, etc. are examples for facilitating understanding of the present invention, and can be appropriately changed according to the specifications of the non-aqueous electrolyte secondary battery. .
- the characteristic portions thereof will be used in combination as appropriate.
- the word "abbreviated” when the word "abbreviated” is used, it is used with the same meaning as the word “approximately”, and the requirement of "abbreviated” is satisfied if it is substantially the same.
- FIG. 1 is a vertical cross-sectional view of a non-aqueous electrolyte secondary battery 10 that is an example of an embodiment.
- an electrode body 14 and an electrolytic solution (not shown) are housed in an exterior body 15 .
- the electrode body 14 has a wound structure in which a strip-shaped positive electrode 11 and a strip-shaped negative electrode 12 are wound with a separator 13 interposed therebetween.
- Carbonates, lactones, ethers, ketones, esters and the like can be used as the non-aqueous solvent (organic solvent) of the electrolytic solution, and two or more of these solvents can be used in combination.
- a mixed solvent containing a cyclic carbonate and a chain carbonate For example, cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC) can be used, and chain carbonates such as dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), and diethyl carbonate ( DEC) or the like can be used.
- DMC dimethyl carbonate
- EMC ethylmethyl carbonate
- DEC diethyl carbonate
- LiPF 6 , LiBF 4 , LiCF 3 SO 3 and mixtures thereof can be used as the electrolyte salt of the electrolytic solution.
- the amount of the electrolyte salt dissolved in the non-aqueous solvent can be, for example, 0.5 mol/L to 2.0 mol/L.
- the sealing member 16 side will be referred to as "upper”
- the bottom side of the outer package 15 will be referred to as "lower”.
- the interior of the secondary battery 10 is hermetically sealed by sealing the opening at the upper end of the exterior body 15 with the sealing body 16 .
- Insulating plates 17 and 18 are provided above and below the electrode body 14, respectively.
- the positive electrode lead 19 extends vertically through the through hole of the insulating plate 17 and connects the filter 22 which is the bottom plate of the sealing member 16 and the positive electrode 11 included in the electrode assembly 14 .
- the positive electrode 11 and the sealing member 16 are connected, and in the secondary battery 10, the cap 26, which is the top plate of the sealing member 16 electrically connected to the filter 22, serves as a positive electrode terminal.
- the positive electrode lead 19 is, for example, an aluminum lead.
- the negative electrode lead 20 extends through the through hole of the insulating plate 18 to the bottom side of the exterior body 15 and is welded to the bottom inner surface of the exterior body 15 .
- the negative electrode lead 20 is, for example, a nickel lead.
- the number of positive electrode leads 19 led out from the electrode assembly 14 may be three or more. Thereby, the connection resistance between the positive electrode 11 and the sealing member 16 can be suppressed, so that the output characteristics of the secondary battery 10 can be improved. As the number of the positive leads 19 increases, the connection resistance is suppressed, but the cost increases. Therefore, from the viewpoint of achieving both the effect of suppressing the connection resistance and the cost, the number of the positive leads 19 is 3 to 10. is preferred, 3 to 8 are more preferred, and 3 to 6 are particularly preferred.
- the three or more positive electrode leads 19 led out from the electrode body 14 may be directly connected to the sealing member 16, or may be connected to the sealing member 16 via a known collector member. Also, the mode of connection between the negative electrode 12 and the outer package 15 is not particularly limited, and a plurality of negative electrode leads 20 may be used for connection.
- the exterior body 15 has a bottomed cylindrical shape with an outer diameter of 25 mm or more.
- the outer diameter of the exterior body 15 is preferably 30 mm or more, more preferably 35 mm or more.
- the outer diameter of the exterior body 15 may be 38 mm or more, 40 mm or more, 45 mm or more, or 50 mm or more.
- the outer diameter of the exterior body 15 may be, for example, 60 mm or less. Within this range, the cost can be suppressed while maintaining the output characteristics of the secondary battery 10 .
- the thickness of the exterior body 15 is, for example, 0.1 mm to 2 mm, and the inner diameter of the exterior body 15 is preferably 24 mm or more, more preferably 29 mm or more, and particularly preferably 34 mm or more.
- the inner diameter of the exterior body 15 may be 37 mm or more, 39 mm or more, 44 mm or more, or 49 mm or more.
- the exterior body 15 is, for example, a metal exterior can.
- a gasket 27 is provided between the exterior body 15 and the sealing body 16 to ensure hermetic sealing of the inside of the secondary battery 10 .
- the exterior body 15 has a grooved portion 21 that supports the sealing body 16 and is formed, for example, by pressing the side portion from the outside.
- the grooved portion 21 is preferably annularly formed along the circumferential direction of the exterior body 15 and supports the sealing body 16 on its upper surface.
- the sealing body 16 has a filter 22, a lower valve body 23, an insulating member 24, an upper valve body 25, and a cap 26 which are stacked in order from the electrode body 14 side.
- Each member constituting the sealing member 16 has, for example, a disk shape or a ring shape, and each member other than the insulating member 24 is electrically connected to each other.
- the lower valve body 23 and the upper valve body 25 are connected to each other at their central portions, and an insulating member 24 is interposed between their peripheral edge portions.
- FIG. 2 is a front view showing a developed state of the positive electrode 11 and the negative electrode 12 that constitute the electrode assembly 14 of the secondary battery 10 of FIG.
- the positive electrode 11 has a positive electrode current collector 30 and a positive electrode mixture layer 32 formed on the surface of the positive electrode current collector 30
- the negative electrode 12 includes the negative electrode current collector 40 and the surface of the negative electrode current collector 40 . and a negative electrode mixture layer 42 formed on the substrate.
- the positive electrode 11 has, at its upper end, a positive electrode current collector exposed portion 34 where the positive electrode current collector 30 is exposed. good.
- the area of the positive electrode mixture layer 32 can be increased while securing the area of the positive electrode current collector exposed portion 34. 10 can be improved.
- FIGS. 3(a) and 3(b) are plan views showing positions where the positive electrode lead 19 is arranged on the upper surface of the electrode body 14.
- FIG. 3(a) and 3(b) are plan views showing positions where the positive electrode lead 19 is arranged on the upper surface of the electrode body 14.
- the positive electrode leads 19 may be arranged in a substantially straight line in the radial direction, as shown in FIG. 3(a). This makes it easier to bundle the positive electrode lead 19 and to easily join the positive electrode lead 19 to the filter 22 . Note that the positive electrode lead 19 may be joined to the filter 22 at a plurality of locations.
- the positive electrode lead 19 may be arranged at substantially even angles as shown in FIG. 3(b). As a result, each of the plurality of positive electrode leads 19 can be easily joined to the filter 22 without being obstructed by the other positive electrode leads 19 .
- FIG. 1 the same reference numerals as in the embodiment shown in FIG. 1 are given to the same configurations as in the embodiment shown in FIG. 1, and the description thereof is omitted. Further, in the following embodiment, explanations of the same effects and modifications as those of the embodiment shown in FIG. 1 will be omitted.
- FIG. 4 is a diagram corresponding to FIG. 1 in another example of the embodiment.
- the positive electrode 11 included in the electrode body 14 is connected to the positive current collecting member 50 , and the positive current collecting member 50 and the sealing member 16 are connected by the positive lead 19 .
- the positive electrode 11 and the sealing member 16 are connected, and in the secondary battery 10, the cap 26, which is the top plate of the sealing member 16 electrically connected to the filter 22, serves as a positive electrode terminal.
- the negative electrode 12 included in the electrode body 14 is connected to the negative electrode current collecting member 52 , and the negative electrode current collecting member 52 and the exterior body 15 are connected by the negative electrode lead 20 .
- the negative electrode 12 and the exterior body 15 are connected, and in the secondary battery 10, the exterior body 15 becomes a negative electrode terminal.
- the manner of connection between the negative electrode 12 and the exterior body 15 is not particularly limited. For example, they may be connected by the negative electrode lead 20 as in the embodiment shown in FIG.
- the positive electrode current collecting member 50 is not particularly limited in material, shape, etc., as long as it can be connected to the positive electrode 11 and the sealing member 16.
- it may be a disk-shaped member made of aluminum.
- the positive electrode collector 50 may have a single hole or a plurality of holes at arbitrary positions from the viewpoint of circulation of the electrolytic solution.
- the material, shape, and the like of the negative electrode current collecting member 52 are not particularly limited as long as they can be connected to the negative electrode 12 and the exterior body 15.
- the negative electrode current collecting member 52 may be a disc-shaped member made of nickel.
- the negative electrode current collecting member 52 may have a single hole or a plurality of holes at arbitrary positions from the viewpoint of circulation of the electrolytic solution.
- FIG. 5 is a perspective view of the electrode body 14 in the secondary battery 10 shown in FIG. 4, showing the configuration of the positive electrode 11, the negative electrode 12, and the separator 13 in a state where the vicinity of the outer end portion of the winding is unfolded. .
- the positive electrode 11 protrudes above the negative electrode 12 and the separator 13 .
- the positive electrode 11 is connected to the positive current collecting member 50 .
- the positive electrode 11 may have a positive electrode current collector exposed portion 34 in which the positive electrode current collector 30 is exposed at the upper end portion. Thereby, the positive electrode 11 and the positive electrode current collecting member 50 can be connected more reliably.
- the negative electrode 12 protrudes downward from the positive electrode 11 and the separator 13 . Thereby, the negative electrode 12 is connected to the negative electrode current collecting member 52 . As shown in FIG. 5, the negative electrode 12 may have a positive electrode current collector exposed portion 44 in which the negative electrode current collector 40 is exposed at the lower end portion. Thereby, the negative electrode 12 and the negative electrode current collecting member 52 can be more reliably connected.
- the positive electrode 11, the negative electrode 12, and the separator 13, which constitute the electrode assembly 14, will be described in detail, particularly the positive electrode 11.
- the positive electrode 11, the negative electrode 12, and the separator 13, which will be described below, can be applied to any of the above-described embodiments.
- the positive electrode 11 has a positive electrode current collector 30 and a positive electrode mixture layer 32 formed on the surface of the positive electrode current collector 30 .
- the positive electrode mixture layers 32 are preferably formed on both sides of the positive electrode current collector 30 .
- a foil of a metal stable in the potential range of the positive electrode 11, such as aluminum or an aluminum alloy, or a film having the metal on the surface thereof can be used.
- the positive electrode mixture layer 32 contains a positive electrode active material and a conductive agent.
- a positive electrode slurry containing a positive electrode active material, a conductive agent, etc. is applied to the surface of the positive electrode current collector 30, the coating film is dried, and then compressed to form a positive electrode mixture layer 32 on the surface of the positive electrode current collector. It can be produced by forming on both sides of 30 .
- the basis weight of the positive electrode mixture layer 32 is 250 g/m 2 or more. Thereby, the cost of the secondary battery 10 can be suppressed.
- the basis weight of the positive electrode mixture layer 32 may be 400 g/m 2 or less.
- the thickness of the positive electrode mixture layer 32 is, for example, 10 ⁇ m to 150 ⁇ m on one side of the positive electrode current collector 30 .
- the conductive agent contained in the positive electrode mixture layer 32 contains carbon fiber.
- the content of the carbon fiber in the positive electrode mixture layer 32 may be 0.01 parts by mass to 1 part by mass with respect to 100 parts by mass of the positive electrode active material. Containing the above-described predetermined amount of carbon fiber in the positive electrode mixture layer 32 is thought to ensure conductive paths in the positive electrode mixture layer 32 and contribute to improved durability. If the carbon fiber content is less than 0.01 part by mass, the conductive path of the positive electrode mixture layer 32 is not sufficiently secured. Movement of the electrolytic solution is likely to be hindered, and in either case, deterioration in durability is likely to occur.
- Carbon fibers include known materials used as conductive agents in batteries, such as carbon nanotubes (CNT), carbon nanofibers (CNF), vapor grown carbon fibers (VGCF), electrospun carbon fibers, Polyacrylonitrile (PAN)-based carbon fiber, pitch-based carbon fiber, and the like are included.
- CNT carbon nanotubes
- CNF carbon nanofibers
- VGCF vapor grown carbon fibers
- PAN Polyacrylonitrile
- the outermost circumference diameter of the carbon fiber is, for example, 1 nm to 20 nm from the viewpoint of ensuring the conductive path of the positive electrode mixture layer 32 by improving the conductivity of the carbon fiber itself and adding a small amount of carbon fiber to improve the conductivity. is preferred, and 1.5 nm to 10 nm is more preferred.
- the outermost diameter of carbon fibers is the average value of the outer diameters of 50 arbitrary carbon fibers measured by a field emission scanning microscope (FE-SEM) or a transmission electron microscope (TEM).
- the fiber length of the carbon fiber is preferably 0.1 ⁇ m to 20 ⁇ m, more preferably 1 ⁇ m to 10 ⁇ m, more preferably 1 ⁇ m to 1 ⁇ m, in order to ensure a conductive path between active materials in the positive electrode mixture layer 32, for example. 5 ⁇ m is particularly preferred.
- the fiber length of carbon fibers is the average value of the lengths of 50 arbitrary carbon fibers measured by a field emission scanning microscope (FE-SEM).
- Carbon nanotubes include single-walled carbon nanotubes, double-walled carbon nanotubes, and multi-walled carbon nanotubes.
- a single-walled carbon nanotube (SWCNT) is a carbon nanostructure in which one layer of graphene sheets constitutes a cylindrical shape, and a double-walled carbon nanotube has two layers of graphene sheets, which are concentrically stacked to form a single line.
- a multi-walled carbon nanotube is a carbon nanostructure in which three or more graphene sheets are concentrically laminated to form a single cylindrical shape.
- the graphene sheet refers to a layer in which carbon atoms of sp2 hybridized orbitals constituting a crystal of graphite (graphite) are positioned at vertexes of a regular hexagon.
- the shape of carbon nanotubes is not limited. Such shapes include a variety of forms including needles, cylindrical tubes, fish bones (fish bones or cup stacks), tramp (platelets) and coils.
- the carbon nanotubes contained in the positive electrode mixture layer 32 preferably contain single-walled carbon nanotubes.
- single-walled carbon nanotubes form a conductive path in the positive electrode mixture layer 32 in a smaller amount than multi-walled carbon nanotubes. It is believed that the migration of non-aqueous solvents and electrolytes at 32 is facilitated.
- the positive electrode mixture layer 32 may contain not only single-walled carbon nanotubes but also double-walled carbon nanotubes and multi-walled carbon nanotubes.
- the conductive agent contained in the positive electrode mixture layer 32 contains amorphous carbon.
- amorphous carbon include carbon materials such as carbon black (CB), acetylene black (AB), ketjen black, and graphite. These may be used singly or in combination of two or more.
- the content of amorphous carbon in the positive electrode mixture layer 32 may be 1 to 3 parts by mass with respect to 100 parts by mass of the positive electrode active material.
- the positive electrode active material contained in the positive electrode mixture layer 32 contains a lithium-containing composite oxide.
- the lithium-containing composite oxide is, for example, secondary particles formed by aggregation of a plurality of primary particles.
- the particle size of the primary particles that make up the secondary particles is, for example, 0.05 ⁇ m to 1 ⁇ m.
- the particle size of primary particles is measured as the diameter of the circumscribed circle in a particle image observed by a scanning electron microscope (SEM).
- the volume-based median diameter (D50) of the secondary particles of the lithium-containing composite oxide is, for example, 1 ⁇ m to 30 ⁇ m, preferably 3 ⁇ m to 20 ⁇ m.
- D50 means a particle size at which the cumulative frequency is 50% from the smaller particle size in the volume-based particle size distribution, and is also called median diameter.
- the particle size distribution of the composite oxide (Z) can be measured using a laser diffraction particle size distribution analyzer (eg MT3000II manufactured by Microtrack Bell Co., Ltd.) using water as a dispersion medium.
- the lithium-containing composite oxide has a layered rock salt structure.
- the layered rock salt structure of the lithium-containing composite oxide belongs to, for example, space group R-3m, space group C2/m, and the like. From the viewpoints of high capacity, stability of the crystal structure, etc., the lithium-containing composite oxide preferably has a layered rock salt structure belonging to the space group R-3m.
- the layered rock salt structure of the lithium-containing composite oxide may include a transition metal layer, a Li layer and an oxygen layer.
- the lithium-containing composite oxide does not substantially contain Co and contains at least Ni and Mn.
- substantially free of Co means that the lithium-containing composite oxide contains only 0.01 mol % or less of Co with respect to the total amount of metal elements excluding Li. Since Co is expensive, material costs can be reduced by substantially not containing Co.
- the content of Ni in the lithium-containing composite oxide is preferably 70 mol % or more, more preferably 70 mol % to 95 mol %, relative to the total number of moles of metal elements excluding Li. Thereby, a high-capacity battery can be obtained. It is particularly preferable that the ratio of Ni to the total number of moles of metal elements excluding Li in the lithium-containing composite oxide is 80 mol % or more. Thereby, a battery with a higher capacity can be obtained. In general, if the Ni content is high, the safety may decrease, but the inclusion of Mn can improve the safety. Also, Mn is an inexpensive element. As a result, even if the Ni content is high, a low-cost, high-capacity battery can be obtained without lowering the safety of the battery.
- the positive electrode active material may contain lithium-containing composite oxides other than those represented by the above general formula, or other compounds within a range that does not impair the purpose of the present disclosure.
- the molar fraction of metal elements contained in the whole particles of the lithium-containing composite oxide is measured by inductively coupled plasma (ICP) emission spectrometry.
- ICP inductively coupled plasma
- Chalcogen compounds such as oxides, sulfates and niobates, and halogen compounds such as fluorides may adhere to the surface of the lithium-containing composite oxide. Thereby, the surface state of the lithium-containing composite oxide can be stabilized by electronic interaction.
- the amount of the chalcogen compound and the halogen compound adhering to the surface of the lithium-containing composite oxide is 0.05 mol% to 0.50 mol% with respect to the total number of moles of metal elements excluding Li in the lithium-containing composite oxide. Preferably.
- Chalcogen compounds include CaO, SrO, Al2O3 , ZrO2, TiO2 , Li2SO4 , LiNbO3 , CaTiO3 , BaTiO3 , Li3BO3 , Li2WO4 , Li4WO5 , Li 6 W 2 O 9 and the like can be exemplified.
- LiF etc. can be illustrated as a halogen compound.
- the surface of the lithium-containing composite oxide to which the chalcogen compound or halogen compound adheres means the surface of the secondary particles of the lithium-containing composite oxide.
- the chalcogen compound and the halogen compound may adhere to the surfaces of the primary particles of the lithium-containing composite oxide.
- the chalcogen compound and the halogen compound for example, may exist uniformly on the entire surface of the lithium-containing composite oxide, or may exist partially.
- the presence of chalcogen compounds and halogen compounds on the surface of the lithium-containing composite oxide can be confirmed by energy dispersive X-ray spectroscopy (TEM-EDX).
- the method for producing a positive electrode active material includes, for example, a first step of obtaining a composite oxide containing Ni and an arbitrary metal element, and a second step of mixing the composite oxide obtained in the first step and a Li compound to obtain a mixture. and a third step of firing the mixture.
- the first step for example, while stirring a metal salt solution containing essential metal elements such as Ni and Mn and optional metal elements such as Al, an alkaline solution such as sodium hydroxide is added dropwise to adjust the pH.
- an alkaline solution such as sodium hydroxide
- a composite hydroxide containing Ni, Mn and an arbitrary metal element is precipitated (coprecipitated), and the composite hydroxide is calcined. , Ni, Mn and any metal element can be obtained.
- the firing temperature is not particularly limited, but may be in the range of 300°C to 600°C, for example.
- the composite oxide obtained in the first step and the Li raw material can be mixed to obtain a mixture.
- Li raw materials include Li2CO3 , LiOH , Li2O2 , Li2O , LiNO3 , LiNO2 , Li2SO4 , LiOH.H2O , LiH, and LiF.
- the mixing ratio of the above composite oxide and the Li raw material may be appropriately determined so that each element in the finally obtained lithium-containing composite oxide has a desired ratio.
- the molar ratio of Li to the metal element other than Li is preferably such that the molar ratio of the metal element other than Li to Li is in the range of 1:0.9 to 1:1.3.
- raw materials for the chalcogen compound or halogen compound adhering to the surface of the lithium-containing composite oxide may be mixed.
- chalcogen compound raw materials include Ca(OH) 2 , CaO, CaCO 3 , CaSO 4 , Ca(NO 3 ) 2 , Sr(OH) 2 , Sr(OH) 2.8H 2 O , SrO, SrCO 3 , SrSO 4 , Sr(NO 3 ) 2 , Al(OH) 3 , Al 2 O 3 , Zr(OH) 4 , ZrO 2 , Ti(OH) 4 , TiO 2 , Nb(OH) 5 and the like.
- halogen compound raw materials include LiF and CaF 2 .
- the mixture obtained in the second step is fired in an oxygen atmosphere to obtain the lithium-containing composite oxide according to this embodiment.
- the temperature increase rate at 450 ° C. or higher and 680 ° C. or lower is in the range of more than 0.1 ° C./min and 5.5 ° C./min or less, and the maximum temperature reached is in the range of 700 ° C. or higher and 850 ° C. or lower.
- the rate of temperature increase from over 680° C. to the maximum temperature reached may be, for example, 0.1° C./min to 3.5° C./min.
- the retention time of the highest temperature reached may be 1 hour or more and 10 hours or less.
- the third step may be multi-step firing, and multiple first heating rates and second heating rates may be set for each temperature range as long as they are within the ranges defined above.
- the lithium-containing composite oxide powder obtained in the third step may be washed with water in order to improve battery capacity and safety.
- This water washing can be carried out by a known method and under conditions as long as lithium is not eluted from the lithium-containing composite oxide and the battery characteristics are not deteriorated.
- Li 2 SO 4 , Li 3 BO 3 , Li 2 WO 4 , Li 4 WO 5 and Li 6 W 2 O 9 among the chalcogen compounds and AlF 3 among the halogen compounds are obtained in the third step.
- a lithium-containing composite oxide having Li 2 SO 4 or AlF 3 on the surface of the lithium-containing composite oxide can be obtained by coating the lithium-containing composite oxide powder using a known method and conditions.
- the positive electrode mixture layer 32 may further contain Li 2 NiO 2 .
- Li 2 NiO 2 contains a large amount of Li and functions as a Li supplement that supplies Li ions to the negative electrode 12 during initial charge and discharge.
- Li 2 NiO 2 may have a structure identified in the space group Immm.
- the mass of Li 2 NiO 2 contained in the positive electrode mixture layer 32 may be 1 to 10 parts by mass when the positive electrode active material contained in the positive electrode mixture layer 32 is 100 parts by mass. If the mass of Li 2 NiO 2 contained in the positive electrode mixture layer 32 is 1 part by mass or more, a sufficient amount of Li ions can be supplied to the negative electrode. In addition, as will be described later, at least part of Li 2 NiO 2 changes to a compound represented by the general formula Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5).
- the mass of Li 2 NiO 2 contained in the positive electrode mixture layer 32 is more than 10 parts by mass, the compound represented by the general formula Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5) Since the contribution to the discharge capacity is smaller than that of the lithium-containing composite oxide, the battery capacity is lowered.
- the positive electrode mixture layer 32 may further contain a compound represented by the general formula Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5).
- a compound represented by Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5) releases and absorbs Li ions during charging and discharging, and functions as a positive electrode active material.
- the mass of the compound represented by Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5) contained in the positive electrode mixture layer 32 is 100 parts by mass of the positive electrode active material contained in the positive electrode mixture layer 32. , it may be 0.1 to 5 parts by mass. If the mass of the compound represented by the general formula Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5) contained in the positive electrode mixture layer 32 is 0.1 parts by mass or more, the amount is sufficient for the negative electrode. of Li ions can be supplied.
- the mass of the compound represented by the general formula Li a Ni 2-a O 2 (0 ⁇ a ⁇ 0.5) contained in the positive electrode mixture layer 32 exceeds 5 parts by mass, the mass of the compound represented by the general formula Li a Ni
- the compound represented by 2-a O 2 (0 ⁇ a ⁇ 0.5) contributes less to the charge/discharge capacity than the lithium-containing composite oxide, resulting in a decrease in battery capacity.
- the positive electrode mixture layer 32 may further contain a binder.
- binders include fluorine-based polymers and rubber-based polymers.
- fluorine-based polymers include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), and modified products thereof.
- rubber-based polymers include ethylene-propylene-isoprene copolymers. coalescence, ethylene-propylene-butadiene copolymer, and the like. These may be used singly or in combination of two or more.
- the negative electrode 12 has a negative electrode current collector 40 and a negative electrode mixture layer 42 formed on the surface of the negative electrode current collector 40 .
- the negative electrode mixture layers 42 are preferably formed on both sides of the negative electrode current collector 40 .
- a foil of a metal such as copper or a copper alloy that is stable in the potential range of the negative electrode 12, a film having the metal on the surface layer, or the like can be used.
- the negative electrode mixture layer 42 may contain a negative electrode active material, a binder, and the like.
- a negative electrode slurry containing a negative electrode active material, a binder, etc. is applied to the surface of the negative electrode current collector 40, the coating film is dried, and then rolled to form the negative electrode mixture layer 42 as a negative electrode current collector. It can be made by forming on both sides of the body 40 .
- the negative electrode active material contained in the negative electrode mixture layer 42 is not particularly limited as long as it can reversibly absorb and release lithium ions, and carbon materials such as graphite are generally used.
- Graphite may be any of natural graphite such as flaky graphite, massive graphite and earthy graphite, artificial graphite such as massive artificial graphite and graphitized mesophase carbon microbeads.
- a metal alloyed with Li such as Si or Sn, a metal compound containing Si, Sn or the like, a lithium-titanium composite oxide, or the like may be used. Moreover, you may use what provided the carbon film on these.
- Si-containing compound represented by SiO x (0.5 ⁇ x ⁇ 1.6) or a lithium silicate phase represented by Li 2y SiO (2+y) (0 ⁇ y ⁇ 2) contains fine particles of Si.
- a dispersed Si-containing compound or the like may be used in combination with graphite.
- the binder contained in the negative electrode mixture layer 42 fluororesin, PAN, polyimide, acrylic resin, polyolefin, etc. can be used as in the case of the positive electrode 11, but styrene-butadiene rubber (SBR) is used. is preferred. Further, the negative electrode mixture layer 42 may contain CMC or its salt, polyacrylic acid (PAA) or its salt, polyvinyl alcohol (PVA), or the like.
- a porous sheet having ion permeability and insulation is used for the separator 13.
- porous sheets include microporous thin films, woven fabrics, and non-woven fabrics.
- Polyolefins such as polyethylene and polypropylene, cellulose, and the like are suitable for the material of the separator.
- the separator 13 may have a single-layer structure or a laminated structure.
- a layer of resin having high heat resistance such as aramid resin and a filler layer containing inorganic compound filler may be provided on the surface of the separator 13 .
- Example 1 A composite hydroxide represented by [Ni 0.70 Al 0.06 Mn 0.24 ](OH) 2 obtained by a coprecipitation method was fired at 500° C. for 8 hours to obtain a composite oxide (Ni 0.70 Al 0.06 Mn 0.24 O 2 ) was obtained (first step). Next, LiOH and the composite oxide were mixed so that the molar ratio of Li to the total amount of Ni, Al, and Mn was 1.03:1 to obtain a mixture (second step).
- the mixture was heated from room temperature to 650°C at a temperature elevation rate of 2.0°C/min under an oxygen stream with an oxygen concentration of 95% (flow rate of 2 mL/min per 10 cm3 and 5 L/min per 1 kg of the mixture).
- the positive electrode active material was obtained by firing from 650° C. to 780° C. at a temperature increase rate of 0.5° C./min (third step).
- the positive electrode active material was analyzed by an ICP emission spectrometer, and confirmed to be a lithium-containing composite oxide represented by LiNi 0.70 Al 0.06 Mn 0.24 O 2 .
- Preparation of positive electrode 100 parts by mass of the positive electrode active material, 0.1 parts by mass of carbon nanotubes (outermost circumference diameter ( ⁇ ) of 1.5 nm, fiber length (L) of 12 ⁇ m) as a conductive agent, and polyvinylidene fluoride as a binder 2 parts by mass were mixed together, and this mixture was further mixed with N-methyl-2-pyrrolidone (NMP) to prepare a positive electrode slurry.
- NMP N-methyl-2-pyrrolidone
- the slurry is applied to a positive electrode current collector made of aluminum foil with a thickness of 15 ⁇ m so that the basis weight is 250 g / m 2 , and after drying the coating film, the coating film is rolled with a rolling roller to remove the A positive electrode having a positive electrode mixture layer formed on both sides of a positive electrode current collector was obtained by cutting into a predetermined electrode size to be housed in an outer package having a diameter of ⁇ 50 mm. An exposed portion where the surface of the positive electrode current collector was exposed was provided at the upper end portion of the positive electrode.
- Natural graphite was used as the negative electrode active material.
- a negative electrode active material, sodium carboxymethylcellulose (CMC-Na), and styrene-butadiene rubber (SBR) were mixed in an aqueous solution at a solid content mass ratio of 100:1:1 to prepare a negative electrode slurry.
- the negative electrode slurry is applied to both sides of a negative electrode current collector made of copper foil, and the coating film is dried, then the coating film is rolled using a rolling roller, cut into a predetermined electrode size, and the negative electrode current collector Thus, a negative electrode having negative electrode mixture layers formed on both sides thereof was obtained.
- An exposed portion where the surface of the negative electrode current collector was exposed was provided at the inner end portion of the winding of the negative electrode.
- Ethylene carbonate (EC), methyl ethyl carbonate (MEC) and dimethyl carbonate (DMC) were mixed in a volume ratio of 3:3:4.
- a non-aqueous electrolyte was prepared by dissolving lithium hexafluorophosphate (LiPF 6 ) in the mixed solvent to a concentration of 1.2 mol/liter.
- the aluminum leads were attached to the exposed portion of the positive electrode at substantially equal intervals so that the six aluminum leads were arranged substantially in a row in the radial direction of the electrode body. Also, one nickel lead was attached to the exposed portion of the negative electrode.
- a wound electrode body was produced by spirally winding the positive electrode and the negative electrode with a polyolefin separator interposed therebetween. This electrode assembly was housed inside an exterior body having an outer diameter of 50 mm, and after the non-aqueous electrolyte was injected, the opening at the upper end of the exterior body was sealed with a sealer to obtain a test cell.
- the cost is the cost per unit battery capacity.
- the battery capacity was measured by constant current charging at a constant current of 0.3 It until the battery voltage reached 4.2 V under a temperature environment of 25°C, and constant voltage charging at 4.2 V until the current value decreased to 1/50 It. gone. After that, constant current discharge was performed at a constant current of 0.5 It until the battery voltage reached 2.5 V, and evaluation was performed. The cost was calculated from the material cost of the test cell.
- the composition of the lithium-containing composite oxide is LiNi 0.75 Mn 0.25 O 2
- the conductive agent is made from 0.1 parts by mass of carbon nanotubes.
- Change to 1.5 parts by mass of acetylene black apply the positive electrode slurry so that the basis weight is 275 g / m 2 , cut it into a predetermined electrode size that can be accommodated in an outer package with an outer diameter of ⁇ 45 mm, and prepare a positive electrode.
- the positive electrode and the sealing body were connected via the positive electrode current collecting member, the negative electrode and the exterior body were connected via the negative electrode current collecting member, and the electrode body was attached to the outside.
- a test cell was obtained in the same manner as in Example 1, except that it was housed in an outer package having a diameter of ⁇ 45 mm.
- Example 3 In the production of the positive electrode active material, the composition of the lithium - containing composite oxide was set to LiNi 0.80 Mn 0.20 O 2 .
- the positive electrode was obtained by applying the slurry and cutting it into a predetermined electrode size to be housed in an outer package with an outer diameter of ⁇ 40 mm.
- a test cell was obtained in the same manner as in Example 1, except that the electrode assembly was housed in an exterior body having an outer diameter of ⁇ 40 mm such that the aluminum leads were arranged at substantially equal angles.
- Example 4 In the production of the positive electrode active material, the composition of the lithium-containing composite oxide was set to LiNi 0.80 Al 0.055 Mn 0.145 O 2 , and in the production of the positive electrode, the basis weight was 325 g / m 2 A test cell was obtained in the same manner as in Example 1, except that the positive electrode slurry was applied so as to obtain a positive electrode slurry and that the number of aluminum leads was changed to three in the preparation of the test cell.
- Example 5 In the production of the positive electrode active material, the composition of the lithium-containing composite oxide was set to LiNi 0.85 Al 0.06 Mn 0.09 O 2 , and in the production of the positive electrode, the basis weight was 350 g / m 2 The positive electrode was obtained by applying the positive electrode slurry so that the positive electrode slurry was applied so that the positive electrode and A test cell was prepared in the same manner as in Example 1, except that the sealing body was connected via the positive electrode current collecting member, the negative electrode and the outer packaging were connected via the negative electrode current collecting member, and the electrode assembly was accommodated in the outer packaging having an outer diameter of ⁇ 45 mm. got
- the composition of the lithium-containing composite oxide was LiNi 0.90 Al 0.05 Mn 0.05 O 2 , and in the production of the positive electrode, 0.1 parts by mass of a conductive agent. 1.5 parts by mass of carbon nanotubes to 1.5 parts by mass of acetylene black, and 5 parts by mass of Li 2 NiO 2 are added to prepare a positive electrode slurry, and a predetermined electrode that is housed in an exterior body with an outer diameter of ⁇ 40 mm. In the same manner as in Example 1, except that the positive electrode was obtained by cutting to size, the number of aluminum leads was changed to 4 in the preparation of the test cell, and the electrode body was accommodated in an outer body with an outer diameter of ⁇ 40 mm. to obtain a test cell.
- Example 7 In the production of the positive electrode active material, the composition of the lithium-containing composite oxide was set to LiNi 0.925 Al 0.055 Mn 0.02 O 2 , and in the production of the positive electrode, 5 parts by mass of Li 2 NiO 2 is added to prepare a positive electrode slurry, the positive electrode slurry is applied so that the basis weight is 300 g/m 2 , and the positive electrode is cut into a predetermined electrode size that can be accommodated in an outer package with an outer diameter of ⁇ 35 mm. As shown in FIG. 4, the positive electrode and the sealing body were connected via the positive electrode current collecting member, the negative electrode and the exterior body were connected via the negative electrode current collecting member, and the electrode body was attached to the outside. A test cell was obtained in the same manner as in Example 1 except that it was housed in an exterior body having a diameter of ⁇ 35 mm.
- Example 8> In the production of the positive electrode active material, the composition of the lithium-containing composite oxide was set to LiNi 0.925 Al 0.05 Mn 0.025 O 2 , and in the production of the positive electrode, the basis weight was 325 g / m 2 In the preparation of the test cell, the positive electrode and the sealing member are connected via the positive electrode current collecting member, and the negative electrode and the exterior body are connected via the negative electrode current collecting member, as shown in FIG. A test cell was obtained in the same manner as in Example 1 except that
- Example 1 A test cell was obtained in the same manner as in Example 1, except that the number of aluminum leads was changed to one in the preparation of the test cell.
- Example 2 A test cell was obtained in the same manner as in Example 1, except that the positive electrode slurry was applied so as to have a basis weight of 200 g/m 2 in the production of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 18 mm. Except for this, a test cell was obtained in the same manner as in Example 1.
- Example 5 A test cell was obtained in the same manner as in Example 2 except that the positive electrode slurry was applied so as to have a basis weight of 190 g/m 2 in the preparation of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 21 mm. Except for this, a test cell was obtained in the same manner as in Example 2.
- Example 7 A test cell was obtained in the same manner as in Example 3, except that the number of aluminum leads was changed to one in the preparation of the test cell.
- Example 8 A test cell was obtained in the same manner as in Example 3, except that the positive electrode slurry was applied so as to have a basis weight of 200 g/m 2 in the production of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 21 mm. Except for this, a test cell was obtained in the same manner as in Example 3.
- Example 10 A test cell was obtained in the same manner as in Example 4, except that the number of aluminum leads was changed to one in the preparation of the test cell.
- Example 11 A test cell was obtained in the same manner as in Example 4, except that the positive electrode slurry was applied so as to have a basis weight of 200 g/m 2 in the production of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 21 mm. Except for this, a test cell was obtained in the same manner as in Example 4.
- Example 14 A test cell was obtained in the same manner as in Example 5, except that the positive electrode slurry was applied so as to have a basis weight of 225 g/m 2 in the preparation of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 21 mm. Except for this, a test cell was obtained in the same manner as in Example 5.
- Example 16 A test cell was obtained in the same manner as in Example 6, except that the number of aluminum leads was changed to one in the preparation of the test cell.
- Example 17 A test cell was obtained in the same manner as in Example 6, except that the positive electrode slurry was applied so as to have a basis weight of 225 g/m 2 in the production of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 18 mm. Except for this, a test cell was obtained in the same manner as in Example 6.
- Example 20 A test cell was obtained in the same manner as in Example 7, except that the positive electrode slurry was applied so that the basis weight was 225 g/m 2 in the preparation of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 21 mm.
- a test cell was obtained in the same manner as in Example 7 except for the above.
- Example 23 A test cell was obtained in the same manner as in Example 8, except that the positive electrode slurry was applied so as to have a basis weight of 225 g/m 2 in the production of the positive electrode.
- the positive electrode was obtained by cutting it into a predetermined electrode size to be accommodated in an outer package with an outer diameter of ⁇ 18 mm. Except for this, a test cell was obtained in the same manner as in Example 8.
- the composition of the lithium-containing composite oxide was set to Ni 0.82 Co 0.15 Al 0.03 O 2 , and in the production of the positive electrode, 0.1 parts by mass of a conductive agent was added. 1.5 parts by mass of acetylene black from the carbon nanotube, apply the positive electrode slurry so that the basis weight is 350 g / m 2 , and cut it into a predetermined electrode size that can be accommodated in an outer package with an outer diameter of ⁇ 45 mm.
- a test cell was obtained in the same manner as in Example 1, except that the number of aluminum leads was changed to 4 in the preparation of the test cell, and the electrode body was housed in an exterior body having an outer diameter of ⁇ 45 mm. got
- Tables 1 to 9 show the costs and internal resistances of the test cells of Examples, Comparative Examples, and Reference Examples.
- Tables 1 to 9 show the composition of the lithium-containing composite oxide (the ratio of each metal element to the total number of moles of metal elements excluding Li), the outer diameter of the battery, the basis weight of the positive electrode mixture layer, and the The amount of carbon nanotubes (CNT), acetylene black (AB), and Li 2 NiO 2 added, the current collection mode of the positive electrode (the mode shown in FIG. 3(a) is "single row", the mode shown in FIG. 3(b) is ""equal", the embodiment shown in FIG. 4 is referred to as "collecting member"), and the number of aluminum leads are also shown.
- the costs of the test cells of Comparative Examples 1 to 3 shown in Table 1 are expressed as relative evaluations based on Example 1.
- the case of equal or lower cost than Example 1 was evaluated as O
- the case of 50% or less higher cost than Example 1 was evaluated as ⁇
- the case of more than 50% higher cost than Example 1 was evaluated as ⁇ .
- the internal resistances of the test cells of Comparative Examples 1 to 3 are expressed relative to the internal resistance of the test cell of Example 1 as 100.
- the costs of the test cells of Comparative Examples 4 to 6 shown in Table 2 are relative evaluations based on Example 2.
- the internal resistances of the test cells of Comparative Examples 4 to 6 are expressed relative to the internal resistance of the test cell of Example 2 as 100.
- the costs of the test cells of Comparative Examples 7 to 9 shown in Table 3 are relative evaluations based on Example 3.
- the internal resistances of the test cells of Comparative Examples 7 to 9 are expressed relative to the internal resistance of the test cell of Example 3 as 100.
- the costs of the test cells of Comparative Examples 10 to 12 shown in Table 4 are relative evaluations based on Example 4.
- the internal resistances of the test cells of Comparative Examples 10 to 12 are expressed relative to the internal resistance of the test cell of Example 4 as 100.
- the costs of the test cells of Comparative Examples 13 to 15 shown in Table 5 are relative evaluations based on Example 5. Also, the internal resistances of the test cells of Comparative Examples 13 to 15 are expressed relative to the internal resistance of the test cell of Example 5 as 100.
- the costs of the test cells of Comparative Examples 16 to 18 shown in Table 6 are relative evaluations based on Example 6.
- the internal resistances of the test cells of Comparative Examples 16 to 18 are expressed relative to the internal resistance of the test cell of Example 6 as 100.
- the costs of the test cells of Comparative Examples 19 to 21 shown in Table 7 are relative evaluations based on Example 7. Also, the internal resistances of the test cells of Comparative Examples 19 to 21 are expressed relative to the internal resistance of the test cell of Example 7 as 100.
- the costs of the test cells of Comparative Examples 22 to 24 shown in Table 8 are relative evaluations based on Example 8. Also, the internal resistances of the test cells of Comparative Examples 22 to 24 are expressed relative to the internal resistance of the test cell of Example 8 as 100.
- the costs of the test cells of Reference Examples 1 to 3 shown in Table 9 are relative evaluations based on Reference Example 1.
- the internal resistances of the test cells of Reference Examples 1 to 3 are expressed relative to the internal resistance of the test cell of Reference Example 1 as 100.
- the example achieves both cost reduction and internal resistance reduction compared to the comparative example.
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Abstract
Description
正極11は、正極集電体30と、正極集電体30の表面に形成された正極合剤層32とを有する。正極合剤層32は、正極集電体30の両面に形成されることが好ましい。正極集電体30には、アルミニウム、アルミニウム合金など、正極11の電位範囲で安定な金属の箔、当該金属を表層に配置したフィルム等を用いることができる。正極合剤層32は、正極活物質及び導電剤を含む。正極11は、例えば、正極集電体30の表面に正極活物質、導電剤等を含む正極スラリーを塗布し、塗膜を乾燥させた後、圧縮して正極合剤層32を正極集電体30の両面に形成することにより作製できる。
負極12は、負極集電体40と、負極集電体40の表面に形成された負極合剤層42とを有する。負極合剤層42は、負極集電体40の両面に形成されることが好ましい。負極集電体40には、銅、銅合金等の負極12の電位範囲で安定な金属の箔、当該金属を表層に配置したフィルムなどを用いることができる。負極合剤層42は、負極活物質、結着剤等を含んでもよい。負極12は、例えば、負極集電体40の表面に負極活物質、結着剤等を含む負極スラリーを塗布し、塗膜を乾燥させた後、圧延して負極合剤層42を負極集電体40の両面に形成することにより作製できる。
セパレータ13には、例えば、イオン透過性及び絶縁性を有する多孔性シートが用いられる。多孔性シートの具体例としては、微多孔薄膜、織布、不織布等が挙げられる。セパレータの材質としては、ポリエチレン、ポリプロピレン等のポリオレフィン、セルロースなどが好適である。セパレータ13は、単層構造であってもよく、積層構造を有していてもよい。また、セパレータ13の表面には、アラミド樹脂等の耐熱性の高い樹脂層、無機化合物のフィラーを含むフィラー層が設けられていてもよい。
<実施例1>
共沈法により得られた[Ni0.70Al0.06Mn0.24](OH)2で表される複合水酸化物を500℃で8時間焼成し、複合酸化物(Ni0.70Al0.06Mn0.24O2)を得た(第1工程)。次に、LiOH、上記複合酸化物を、Liと、Ni、Al、及びMnの総量とのモル比が1.03:1になるように混合して混合物を得た(第2工程)。この混合物を酸素濃度95%の酸素気流下(10cm3あたり2mL/min及び混合物1kgあたり5L/minの流量)で、当該混合物を、昇温速度2.0℃/minで、室温から650℃まで焼成した後、昇温速度0.5℃/minで、650℃から780℃まで焼成して正極活物質を得た(第3工程)。ICP発光分光分析装置により、上記の正極活物質を分析し、LiNi0.70Al0.06Mn0.24O2で表されるリチウム含有複合酸化物であることを確認した。
上記正極活物質100質量部と、導電剤としてのカーボンナノチューブ(最外周径(φ)が1.5nm、繊維長(L)が12μm)0.1質量部と、結着剤としてのポリフッ化ビニリデン2質量部とを混合し、さらに、この混合物とN-メチル-2-ピロリドン(NMP)とを混合して正極スラリーを調製した。次いで、当該スラリーを厚み15μmのアルミニウム箔からなる正極集電体に目付量が250g/m2となるように塗布し、塗膜を乾燥した後、圧延ローラーにより、塗膜を圧延して、外径がφ50mmの外装体に収容される所定の電極サイズに切断して、正極集電体の両面に正極合剤層が形成された正極を得た。なお、正極の上端部に正極集電体の表面が露出した露出部を設けた。
負極活物質として天然黒鉛を用いた。負極活物質と、カルボキシメチルセルロースナトリウム(CMC-Na)と、スチレン-ブタジエンゴム(SBR)を、100:1:1の固形分質量比で水溶液中において混合し、負極スラリーを調製した。当該負極スラリーを銅箔からなる負極集電体の両面に塗布し、塗膜を乾燥させた後、圧延ローラーを用いて塗膜を圧延し、所定の電極サイズに切断して、負極集電体の両面に負極合剤層が形成された負極を得た。なお、負極の巻内端部に負極集電体の表面が露出した露出部を設けた。
エチレンカーボネート(EC)と、メチルエチルカーボネート(MEC)と、ジメチルカーボネート(DMC)とを、3:3:4の体積比で混合した。当該混合溶媒に対して、六フッ化リン酸リチウム(LiPF6)を1.2モル/リットルの濃度となるように溶解させて、非水電解質を調製した。
図3(a)に示すように、6本のアルミニウムリードが電極体の径方向に略一列に配置されるように、アルミニウムリードを上記正極の露出部に略等間隔で取り付けた。また、上記負極の露出部には、1本のニッケルリードを取り付けた。ポリオレフィン製のセパレータを介して正極と負極を渦巻き状に巻回して巻回型電極体を作製した。この電極体を外径50mmの外装体の内部に収容し、上記非水電解質を注入した後、外装体の上端の開口を封口体で封止して試験セルを得た。
上記試験セルについて、コストの評価を行った。コストは、単位電池容量当たりの費用である。電池容量は、25℃の温度環境下、0.3Itの定電流で電池電圧が4.2Vになるまで定電流充電を行い、4.2Vで電流値が1/50Itになるまで定電圧充電を行った。その後、0.5Itの定電流で電池電圧が2.5Vになるまで定電流放電を行い評価した。費用は、試験セルの材料費用から算出した。
上記試験セルについて、25℃の温度条件下で、セル電圧が4.2Vになるまで0.3Itで定電流充電を行い、その後、電流値が1/50Itになるまで4.2Vで定電圧充電を行った。続いて、1.0Itで定電流放電を10秒間実施し、その時に低下した電圧を電流値で割ることで、内部抵抗を求めた。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.75Mn0.25O2になるようにしたことと、正極の作製において、導電剤を0.1質量部のカーボンナノチューブから1.5質量部のアセチレンブラックに変更し、目付量が275g/m2になるように正極スラリーを塗布し、外径がφ45mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、図4に示すように、正極と封口体を正極集電部材経由で接続し、負極と外装体を負極集電部材経由で接続し、電極体を外径φ45mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.80Mn0.20O2になるようにしたことと、正極の作製において、目付量が300g/m2になるように正極スラリーを塗布し、外径がφ40mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、図3(b)に示すように、3本のアルミニウムリードが略均等な角度で配置されるようして、電極体を外径φ40mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.80Al0.055Mn0.145O2になるようにしたことと、正極の作製において、目付量が325g/m2になるように正極スラリーを塗布したことと、試験セルの作製において、アルミニウムリードの本数を3本に変更したこと以外は実施例1と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.85Al0.06Mn0.09O2になるようにしたことと、正極の作製において、目付量が350g/m2になるように正極スラリーを塗布し、外径がφ45mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、図4に示すように、正極と封口体を正極集電部材経由で接続し、負極と外装体を負極集電部材経由で接続し、電極体を外径φ45mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.90Al0.05Mn0.05O2になるようにしたことと、正極の作製において、導電剤を0.1質量部のカーボンナノチューブから1.5質量部のアセチレンブラックに変更し、さらに、5質量部のLi2NiO2を添加して正極スラリーを作製し、外径がφ40mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、アルミニウムリードの本数を4本に変更し、電極体を外径φ40mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.925Al0.055Mn0.02O2になるようにしたことと、正極の作製において、さらに、5質量部のLi2NiO2を添加して正極スラリーを作製し、目付量が300g/m2になるように正極スラリーを塗布し、外径がφ35mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、図4に示すように、正極と封口体を正極集電部材経由で接続し、負極と外装体を負極集電部材経由で接続し、電極体を外径φ35mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がLiNi0.925Al0.05Mn0.025O2になるようにしたことと、正極の作製において、目付量が325g/m2になるように正極スラリーを塗布したことと、試験セルの作製において、図4に示すように、正極と封口体を正極集電部材経由で接続し、負極と外装体を負極集電部材経由で接続したこと以外は実施例1と同様にして試験セルを得た。
試験セルの作製において、アルミニウムリードの本数を1本に変更したこと以外は実施例1と同様にして試験セルを得た。
正極の作製において、目付量が200g/m2になるように正極スラリーを塗布したこと以外は実施例1と同様にして試験セルを得た。
正極の作製において、外径がφ18mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ18mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
試験セルの作製において、正極と封口体及び負極と外装体の接続の態様を、図4に示す態様から、図3(a)に示す態様で、且つ、正極リードの本数が1本となるように変更したこと以外は実施例2と同様にして試験セルを得た。
正極の作製において、目付量が190g/m2になるように正極スラリーを塗布したこと以外は実施例2と同様にして試験セルを得た。
正極の作製において、外径がφ21mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ21mmの外装体に収容したこと以外は実施例2と同様にして試験セルを得た。
試験セルの作製において、アルミニウムリードの本数を1本に変更したこと以外は実施例3と同様にして試験セルを得た。
正極の作製において、目付量が200g/m2になるように正極スラリーを塗布したこと以外は実施例3と同様にして試験セルを得た。
正極の作製において、外径がφ21mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ21mmの外装体に収容したこと以外は実施例3と同様にして試験セルを得た。
試験セルの作製において、アルミニウムリードの本数を1本に変更したこと以外は実施例4と同様にして試験セルを得た。
正極の作製において、目付量が200g/m2になるように正極スラリーを塗布したこと以外は実施例4と同様にして試験セルを得た。
正極の作製において、外径がφ21mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ21mmの外装体に収容したこと以外は実施例4と同様にして試験セルを得た。
試験セルの作製において、正極と封口体及び負極と外装体の接続の態様を、図4に示す態様から、図3(a)に示す態様で、且つ、正極リードの本数が1本となるように変更したこと以外は実施例5と同様にして試験セルを得た。
正極の作製において、目付量が225g/m2になるように正極スラリーを塗布したこと以外は実施例5と同様にして試験セルを得た。
正極の作製において、外径がφ21mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ21mmの外装体に収容したこと以外は実施例5と同様にして試験セルを得た。
試験セルの作製において、アルミニウムリードの本数を1本に変更したこと以外は実施例6と同様にして試験セルを得た。
正極の作製において、目付量が225g/m2になるように正極スラリーを塗布したこと以外は実施例6と同様にして試験セルを得た。
正極の作製において、外径がφ18mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ18mmの外装体に収容したこと以外は実施例6と同様にして試験セルを得た。
試験セルの作製において、正極と封口体及び負極と外装体の接続の態様を、図4に示す態様から、図3(a)に示す態様で、且つ、正極リードの本数が1本となるように変更したこと以外は実施例7と同様にして試験セルを得た。
正極の作製において、目付量が225g/m2になるように正極スラリーを塗布したこと以外は実施例7と同様にして試験セルを得た。
正極の作製において、外径がφ21mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ21mmの外装体に収容したこと以外は実施例7と同様にして試験セルを得た。
試験セルの作製において、正極と封口体及び負極と外装体の接続の態様を、図4に示す態様から、図3(a)に示す態様で、且つ、正極リードの本数が1本となるように変更したこと以外は実施例8と同様にして試験セルを得た。
正極の作製において、目付量が225g/m2になるように正極スラリーを塗布したこと以外は実施例8と同様にして試験セルを得た。
正極の作製において、外径がφ18mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、電極体を外径φ18mmの外装体に収容したこと以外は実施例8と同様にして試験セルを得た。
正極活物質の作製において、リチウム含有複合酸化物の組成がNi0.82Co0.15Al0.03O2になるようにしたことと、正極の作製において、導電剤を0.1質量部のカーボンナノチューブから1.5質量部のアセチレンブラックに変更し、目付量が350g/m2になるように正極スラリーを塗布し、外径がφ45mmの外装体に収容される所定の電極サイズに切断して正極を得たことと、試験セルの作製において、アルミニウムリードの本数を4本に変更し、電極体を外径φ45mmの外装体に収容したこと以外は実施例1と同様にして試験セルを得た。
試験セルの作製において、アルミニウムリードの本数を1本に変更したこと以外は参考例1と同様にして試験セルを得た。
正極の作製において、目付量が225g/m2になるように正極スラリーを塗布したことと、試験セルの作製において、図4に示すように、正極と封口体を正極集電部材経由で接続し、負極と外装体を負極集電部材経由で接続したこと以外は参考例1と同様にして試験セルを得た。
Claims (12)
- 帯状の正極及び帯状の負極がセパレータを介して巻回された電極体と、
前記電極体を収容し、前記負極と接続される、外径が25mm以上で有底円筒形状の外装体と、
前記外装体の上端の開口を封口し、前記正極と接続される、封口体と、を備える非水電解質二次電池であって、
前記正極は、正極集電体と、前記正極集電体の表面に形成され、正極活物質及び導電剤を含有する正極合剤層とを含み、
前記正極活物質は、リチウム含有複合酸化物を含み、当該リチウム含有複合酸化物は、層状岩塩構造を有し、Coを実質的に含有せず、少なくともNi及びMnを含有し、
前記リチウム含有複合酸化物におけるNiの含有率は、Liを除く金属元素の総モル数に対して、70モル%以上であり、
前記正極合剤層の目付量は、250g/m2以上であり、
前記電極体において、3本以上の正極リードが導出されている、非水電解質二次電池。 - 前記正極リードは、前記電極体の上面において、径方向に略一列に配置されている、請求項1に記載の非水電解質二次電池。
- 前記正極リードは、前記電極体の上面において、略均等な角度で配置されている、請求項1に記載の非水電解質二次電池。
- 前記正極は、上端部に前記正極集電体が露出した正極集電体露出部を有し、前記正極リードが前記正極集電体露出部に接続されている、請求項1~3のいずれか1項に記載の非水電解質二次電池。
- 帯状の正極及び帯状の負極がセパレータを介して巻回された電極体と、
前記電極体を収容し、前記負極と接続される、外径が25mm以上で有底円筒形状の外装体と、
前記外装体の上端の開口を封口し、前記正極と接続される、封口体と、を備える非水電解質二次電池であって、
前記正極は、正極集電体と、前記正極集電体の表面に形成され、正極活物質及び導電剤を含有する正極合剤層とを含み、
前記正極活物質は、リチウム含有複合酸化物を含み、当該リチウム含有複合酸化物は、層状岩塩構造を有し、Coを実質的に含有せず、少なくともNi及びMnを含有し、
前記リチウム含有複合酸化物におけるNiの含有率は、Liを除く金属元素の総モル数に対して、70モル%以上であり、
前記正極合剤層の目付量は、250g/m2以上であり、
前記電極体において前記負極及び前記セパレータよりも上方に突出した前記正極が、正極集電部材と接続され、前記正極集電部材と前記封口体とが正極リードで接続されている、非水電解質二次電池。 - 前記導電剤は、炭素繊維を含み、前記正極合剤層における前記炭素繊維の含有量は、100質量部の前記正極活物質に対して、0.01質量部~1質量部である、請求項1~5のいずれか1項に記載の非水電解質二次電池。
- 前記導電剤は、無定形炭素を含み、前記正極合剤層に含まれる前記無定形炭素の含有量は、100質量部の前記正極活物質に対して、1質量部~3質量部である、請求項1~6のいずれか1項に記載の非水電解質二次電池。
- 前記リチウム含有複合酸化物におけるNiの含有率は、Liを除く金属元素の総モル数に対して、70モル%~95モル%である、請求項1~7のいずれか1項に記載の非水電解質二次電池。
- 前記正極合剤層は、さらに、Li2NiO2を含有する、請求項1~8のいずれか1項に記載の非水電解質二次電池。
- 前記正極合剤層に含まれるLi2NiO2の質量は、前記正極合剤層に含まれる前記正極活物質を100質量部とした場合に、1質量部~10質量部である、請求項9に記載の非水電解質二次電池。
- 前記正極合剤層は、さらに、一般式LiaNi2-aO2(0<a≦0.5)で表される化合物を含有する、請求項1~10のいずれか1項に記載の非水電解質二次電池。
- 前記正極合剤層に含まれる一般式LiaNi2-aO2(0<a≦0.5)で表される化合物の質量は、前記正極合剤層に含まれる前記正極活物質を100質量部とした場合に、0.1質量部~5質量部である、請求項11に記載の非水電解質二次電池。
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| EP22770801.3A EP4310946A4 (en) | 2021-03-18 | 2022-01-06 | SECONDARY BATTERY WITH NON-AQUEOUS ELECTROLYTE |
| JP2023506772A JP7745169B2 (ja) | 2021-03-18 | 2022-01-06 | 非水電解質二次電池 |
| CN202280020399.2A CN117015891A (zh) | 2021-03-18 | 2022-01-06 | 非水电解质二次电池 |
| US18/281,082 US20240145700A1 (en) | 2021-03-18 | 2022-01-06 | Non-aqueous electrolyte secondary battery |
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| JPH10326621A (ja) * | 1997-03-28 | 1998-12-08 | Fuji Photo Film Co Ltd | リチウムイオン非水電解質二次電池 |
| JP2008010400A (ja) * | 2006-06-02 | 2008-01-17 | Matsushita Electric Ind Co Ltd | 二次電池 |
| JP2008192321A (ja) * | 2007-01-31 | 2008-08-21 | Sanyo Electric Co Ltd | 円筒型蓄電池およびその製造方法 |
| JP2011108505A (ja) * | 2009-11-18 | 2011-06-02 | Toyota Motor Corp | リチウムイオン二次電池 |
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| JPH11111259A (ja) * | 1997-09-30 | 1999-04-23 | Shin Kobe Electric Mach Co Ltd | 捲回式電池 |
| WO2013128677A1 (ja) * | 2012-02-29 | 2013-09-06 | 新神戸電機株式会社 | リチウムイオン電池 |
| WO2015034257A1 (ko) * | 2013-09-05 | 2015-03-12 | 주식회사 엘지화학 | 고용량 리튬 이차전지용 양극 첨가제 |
| JP6237546B2 (ja) * | 2014-09-11 | 2017-11-29 | トヨタ自動車株式会社 | 非水電解質二次電池 |
| KR20190131842A (ko) * | 2018-05-17 | 2019-11-27 | 주식회사 엘지화학 | 이차전지용 양극 활물질, 그 제조방법 및 이를 포함하는 리튬 이차전지 |
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- 2022-01-06 JP JP2023506772A patent/JP7745169B2/ja active Active
- 2022-01-06 CN CN202280020399.2A patent/CN117015891A/zh active Pending
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|---|---|---|---|---|
| JPH10326621A (ja) * | 1997-03-28 | 1998-12-08 | Fuji Photo Film Co Ltd | リチウムイオン非水電解質二次電池 |
| JP2008010400A (ja) * | 2006-06-02 | 2008-01-17 | Matsushita Electric Ind Co Ltd | 二次電池 |
| JP2008192321A (ja) * | 2007-01-31 | 2008-08-21 | Sanyo Electric Co Ltd | 円筒型蓄電池およびその製造方法 |
| JP2011108505A (ja) * | 2009-11-18 | 2011-06-02 | Toyota Motor Corp | リチウムイオン二次電池 |
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| EP4310946A4 (en) | 2025-03-26 |
| US20240145700A1 (en) | 2024-05-02 |
| JPWO2022196039A1 (ja) | 2022-09-22 |
| EP4310946A1 (en) | 2024-01-24 |
| CN117015891A (zh) | 2023-11-07 |
| JP7745169B2 (ja) | 2025-09-29 |
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