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WO2012124582A1 - Procédé de fabrication d'électrode positive pour batteries secondaires à électrolyte non aqueux, électrode positive pour batteries secondaires à électrolyte non aqueux et batterie secondaire à électrolyte non aqueux - Google Patents

Procédé de fabrication d'électrode positive pour batteries secondaires à électrolyte non aqueux, électrode positive pour batteries secondaires à électrolyte non aqueux et batterie secondaire à électrolyte non aqueux Download PDF

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Publication number
WO2012124582A1
WO2012124582A1 PCT/JP2012/055903 JP2012055903W WO2012124582A1 WO 2012124582 A1 WO2012124582 A1 WO 2012124582A1 JP 2012055903 W JP2012055903 W JP 2012055903W WO 2012124582 A1 WO2012124582 A1 WO 2012124582A1
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Prior art keywords
positive electrode
electrolyte secondary
nonaqueous electrolyte
active material
secondary battery
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Ceased
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English (en)
Japanese (ja)
Inventor
聖 高務
貴信 千賀
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • H01M4/0404—Methods of deposition of the material by coating on electrode collectors
    • 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
    • H01M4/139—Processes of manufacture
    • 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
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • H01M4/623—Binders being polymers fluorinated polymers
    • 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

Definitions

  • the present invention relates to a method for manufacturing a positive electrode for a non-aqueous electrolyte secondary battery, a positive electrode for a non-aqueous electrolyte secondary battery manufactured by the manufacturing method, and a non-aqueous electrolyte secondary battery including the same.
  • Patent Documents 1 and 2 it is proposed to use two types of positive electrode active materials having different average particle diameters.
  • Patent Document 3 describes that a mixed solvent of a poor solvent for the binder and a good solvent having a boiling point lower than that of the poor solvent is used for forming the positive electrode active material layer containing the binder.
  • PVDF polyvinylidene fluoride
  • dimethylimidazolidinone is used as a good solvent
  • cyclohexanone is used as a poor solvent.
  • Patent Document 3 when the binder is polyvinylidene fluoride (PVDF), dimethylimidazolidinone is used as a good solvent, and cyclohexanone is used as a poor solvent, the flexibility of the positive electrode is sufficient. It cannot be improved.
  • PVDF polyvinylidene fluoride
  • dimethylimidazolidinone is used as a good solvent
  • cyclohexanone is used as a poor solvent
  • Patent Documents 1 and 2 can be applied only when two types of positive electrode active materials having different average particle diameters are used. For this reason, a new method capable of improving the flexibility of the positive electrode is desired regardless of the type of the positive electrode active material to be used.
  • the present invention has been made in view of such points, and an object thereof is to provide a method capable of producing a positive electrode for a non-aqueous electrolyte secondary battery excellent in flexibility and liquid absorption.
  • the method for producing a positive electrode for a nonaqueous electrolyte secondary battery relates to a method for producing a positive electrode for a nonaqueous electrolyte secondary battery comprising a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is formed on the positive electrode current collector.
  • the positive electrode active material layer includes a positive electrode active material and a binder.
  • the binder is made of at least one of polyvinylidene fluoride and a fluororesin having a polyvinylidene fluoride unit.
  • a slurry containing a positive electrode active material, a binder, N-methyl-2-pyrrolidone, and a polyol having a boiling point higher than that of N-methyl-2-pyrrolidone is applied on the positive electrode current collector.
  • the forming step includes a positive electrode active material, a binder, 1000 parts by weight to 3000 parts by weight of N-methyl-2-pyrrolidone with respect to 100 parts by weight of the binder, and 100 parts by weight of the binder. And a step of preparing a slurry containing 5 to 50 parts by mass of a polyol.
  • the positive electrode for a nonaqueous electrolyte secondary battery according to the present invention is manufactured by the method for manufacturing a positive electrode for a nonaqueous electrolyte secondary battery according to the present invention.
  • the non-aqueous electrolyte secondary battery according to the present invention includes the positive electrode for a non-aqueous electrolyte secondary battery according to the present invention, a negative electrode, and a non-aqueous electrolyte.
  • FIG. 1 is a schematic cross-sectional view of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view of a positive electrode in one embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view for explaining a manufacturing process of a positive electrode in one embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view for explaining the flexibility evaluation process.
  • FIG. 5 is a schematic cross-sectional view for explaining the flexibility evaluation process.
  • FIG. 6 is an electron micrograph of the coating film a.
  • FIG. 7 is an electron micrograph of the coating film b.
  • FIG. 8 is an electron micrograph of the coating film c.
  • FIG. 9 is an electron micrograph of the coating film d.
  • FIG. 10 is an electron micrograph of the coating film e.
  • FIG. 11 is a graph showing the discharge curves of the nonaqueous electrolyte secondary battery A according to Example 8 and the
  • FIG. 1 is a schematic cross-sectional view of a nonaqueous electrolyte secondary battery according to this embodiment. First, the configuration of the nonaqueous electrolyte secondary battery 1 according to the present embodiment will be described with reference to FIG.
  • the nonaqueous electrolyte secondary battery 1 includes a battery container 17.
  • the battery container 17 has a flat shape.
  • the shape of the battery container is not limited to a flat shape.
  • the battery shape may be, for example, a cylindrical shape in which both ends are closed.
  • an electrode body 10 impregnated with a nonaqueous electrolyte is accommodated.
  • the non-aqueous electrolyte for example, a known non-aqueous electrolyte can be used.
  • the nonaqueous electrolyte solvent include cyclic carbonates, chain carbonates, and mixed solvents of cyclic carbonates and chain carbonates. Of these, a chain carbonate and a mixed solvent of a cyclic carbonate and a chain carbonate are preferably used.
  • the mixing ratio of cyclic carbonate and chain carbonate should be in the range of 1: 9 to 5: 5 by volume ratio. Is preferred.
  • cyclic carbonate examples include ethylene carbonate, fluoroethylene carbonate, propylene carbonate, butylene carbonate, vinylene carbonate, vinyl ethylene carbonate, and the like.
  • chain carbonates examples include dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate.
  • nonaqueous electrolyte solute examples include, for example, LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiN (SO 2 C 2 F 5 ) 2 , LiC (SO 2 CF 3). ) 3 , LiC (SO 2 C 2 F 5 ) 3 , LiClO 4 and the like.
  • nonaqueous electrolyte a gel polymer electrolyte obtained by impregnating a polymer such as polyethylene oxide or polyacrylonitrile with an electrolytic solution can be used in addition to the above-described solute dissolved in the solvent.
  • the electrode body 10 is formed by winding a negative electrode 11, a positive electrode 12, and a separator 13 disposed between the negative electrode 11 and the positive electrode 12.
  • the separator 13 can be constituted by a known separator, for example.
  • the separator 13 can be comprised by the porous film made from resin, for example.
  • the resin porous membrane include a polyethylene microporous membrane and a polypropylene microporous membrane.
  • the negative electrode 11 has a negative electrode current collector and a negative electrode active material layer formed on at least one surface of the negative electrode current collector.
  • the negative electrode current collector can be composed of, for example, a foil made of a metal such as Cu or an alloy containing a metal such as Cu.
  • the negative electrode active material layer may include a binder, a conductive agent, and the like in addition to the negative electrode active material. Examples of the negative electrode active material include carbon materials such as graphite and coke, metal oxides such as tin oxide, and materials that are alloyed with lithium.
  • the negative electrode active material alloyed with lithium for example, one or more metals selected from the group consisting of silicon, germanium, tin and aluminum, or one or more types selected from the group consisting of silicon, germanium, tin and aluminum
  • the thing which consists of an alloy containing a metal is mentioned.
  • FIG. 2 is a schematic cross-sectional view of the positive electrode 12 in the present embodiment.
  • the positive electrode 12 includes a positive electrode current collector 12a and a positive electrode active material layer 12b.
  • the positive electrode current collector 12a can be formed of, for example, a metal such as Al or an alloy containing a metal such as Al.
  • the positive electrode active material layer 12b is formed on at least one surface of the positive electrode current collector 12a. Specifically, in the present embodiment, the positive electrode active material layer 12b is formed on both surfaces of the positive electrode current collector 12a.
  • the positive electrode active material layer 12b includes a positive electrode active material and a binder. In the present embodiment, the positive electrode active material layer 12b further includes a conductive agent.
  • the positive electrode active material is preferably a material that can occlude and release lithium and has a high potential.
  • the positive electrode active material include lithium transition metal composite oxides having a layered structure, a spinel structure, or an olivine structure. Among these, lithium transition metal composite oxides having a layered structure with high energy density are preferably used.
  • the lithium transition metal composite oxide having a layered structure include lithium nickel composite oxide, lithium nickel cobalt composite oxide, lithium nickel cobalt aluminum composite oxide, lithium nickel cobalt manganese composite oxide, and lithium cobalt composite oxide. It is done. Among these, lithium cobaltate particles in which aluminum or magnesium is solid-solved and zirconium is fixed to the particle surface are more preferably used because of excellent crystal structure stability.
  • lithium transition metal composite oxide in which the proportion of nickel in the transition metal contained in the positive electrode active material is 50 mol% or more is preferably used.
  • a lithium nickel cobalt aluminum composite oxide is more preferably used.
  • the binder of the positive electrode active material layer 12b is made of at least one of polyvinylidene fluoride (PVDF) and a fluororesin having a PVDF unit.
  • PVDF polyvinylidene fluoride
  • fluororesin having a polyvinylidene fluoride unit include, for example, modified polyvinylidene fluoride.
  • modified polyvinylidene fluoride include those produced by copolymerizing a vinylidene fluoride monomer and another monomer.
  • vinylidene fluoride-vinyl fluoride copolymer vinylidene fluoride-trifluoroethylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer
  • vinylidene fluoride-fluoroalkyl vinyl ether copolymer vinylidene fluoride-maleic anhydride copolymer, vinylidene fluoride-maleic acid monomethyl ester copolymer, and the like.
  • the content of the binder is preferably in the range of 2.0 parts by mass to 5.0 parts by mass with respect to 100 parts by mass of the positive electrode active material.
  • Examples of the conductive agent for the positive electrode active material layer 12b include acetylene black, ketjen black, furnace black, and carbon nanotube.
  • the content of the conductive agent is preferably in the range of 0.1 parts by mass to 5.0 parts by mass with respect to 100 parts by mass of the positive electrode active material.
  • a slurry preparation step for preparing a slurry is performed.
  • the slurry is prepared by appropriately mixing the positive electrode active material, the binder, the conductive agent, N-methyl-2-pyrrolidone (NMP), and a polyol having a boiling point higher than that of NMP. Make it.
  • NMP N-methyl-2-pyrrolidone
  • polyol having a boiling point higher than that of NMP examples include glycerol and trimethylolpropane.
  • the boiling point of the polyol is preferably 40 ° C. or more higher than the boiling point of NMP, more preferably 80 ° C. or more.
  • the boiling point of NMP is 204 ° C.
  • the boiling point of glycerol is 290 ° C., which is 86 ° C. higher than that of NMP.
  • the boiling point of trimethylolpropane is 295 ° C., which is 91 ° C. higher than that of NMP.
  • a slurry application step of applying the prepared slurry onto at least one surface of the positive electrode current collector 12a is performed.
  • the positive electrode mixture layer 12c is formed on at least one surface of the positive electrode current collector 12a.
  • the positive electrode mixture layer 12c is formed on both surfaces of the positive electrode current collector 12a by applying the slurry on both surfaces of the positive electrode current collector 12a.
  • a drying step for forming the positive electrode active material layer 12b shown in FIG. 2 is performed by drying the positive electrode mixture layer 12c. By performing this drying step, the slurry preparation step, and the slurry application step, a forming step for forming the positive electrode active material layer 12b is performed.
  • the drying method of the positive electrode mixture layer 12c is not particularly limited.
  • the positive electrode mixture layer 12c may be dried by heating, or the positive electrode mixture layer 12c may be dried by placing it in a reduced-pressure atmosphere. Moreover, you may dry by heating the positive mix layer 12c, decompressing.
  • NMP and polyol may remain in the positive electrode active material layer 12b as long as the characteristics of the positive electrode active material layer 12b are not significantly deteriorated. Specifically, each content rate of the polyol and NMP in the positive electrode active material layer 12b should just be 100 ppm or less.
  • polyol has a higher boiling point than NMP. Therefore, at least at the initial stage of the drying step, the ratio of the mass of NMP to the mass of NMP and polyol in the positive electrode mixture layer 12c ((NMP mass) / ((NMP mass) + (polyol mass))) becomes small. .
  • the binder is composed of at least one of PVDF and a fluororesin having a PVDF unit.
  • the solubility of the binder in NMP is higher than the solubility of the binder in the polyol. That is, NMP is a good solvent for the binder.
  • the polyol is a poor solvent for the binder. Therefore, at least in the initial stage of the drying step, the content of NMP, which is a good solvent, in the positive electrode mixture layer 12c is reduced, and the content of polyol, which is a poor solvent, is increased. Therefore, the solubility of the binder in the positive electrode mixture layer 12c is lowered at least in the initial stage of the formation process.
  • the binder is precipitated in a gel form. Therefore, the positive electrode active material layer 12b which is porous and excellent in flexibility is formed by subsequent drying. Moreover, since the formed positive electrode active material layer 12b is porous, it has excellent liquid absorbency.
  • the positive electrode 12 manufactured by the manufacturing method of the present embodiment is excellent in flexibility and liquid absorption. Therefore, the nonaqueous electrolyte secondary battery 1 including the positive electrode 12 has high reliability and productivity. The nonaqueous electrolyte secondary battery 1 has excellent discharge load characteristics.
  • the boiling point of the polyol is preferably 40 ° C. or higher, more preferably 80 ° C. or higher than the boiling point of NMP. If the difference between the boiling point of the polyol and the boiling point of NMP is too small, the NMP content in the positive electrode mixture layer 12c is not sufficiently lowered in the drying step, and a sufficiently excellent flexibility may not be obtained. On the other hand, if the boiling point of the polyol is too high, it may be difficult to dry the polyol.
  • the polyol is preferably contained in a proportion of 5 parts by mass or more with respect to 100 parts by mass of the binder, and more preferably in a proportion of 10 parts by mass or more. If the polyol content is too low, sufficiently good flexibility may not be obtained. Further, the polyol is preferably contained in a proportion of 50 parts by mass or less, more preferably 40 parts by mass or less, with respect to 100 parts by mass of the binder. When there is too much content of a polyol, the adhesiveness of the positive electrode active material layer 12b and the positive electrode collector 12a may become low too much.
  • NMP is preferably contained in a proportion of 1000 to 3000 parts by mass with respect to 100 parts by mass of the binder, and more preferably in a proportion of 1500 to 2500 parts by mass. preferable.
  • the content of NMP is too large, the slurry is likely to settle due to a decrease in viscosity, and thus it may be difficult to perform coating.
  • the content of NMP is too small, it may be difficult to apply the slurry to the current collector due to an increase in the viscosity of the slurry.
  • Example 1 LiCoO 2 particles in which 1.0 mol% of aluminum and magnesium were each dissolved and 0.05 mol% of zirconium adhered to the surface were prepared as a positive electrode active material.
  • LiCoO 2 particles, acetylene black (AB) as a conductive agent, polyvinylidene fluoride (PVDF) as a binder, and N-methyl-2-pyrrolidone (NMP) as a good solvent are kneaded. did. Thereafter, an N-methyl-2-pyrrolidone solution containing glycerol as a poor solvent was further added to the kneaded product and stirred to prepare a positive electrode forming slurry.
  • the positive electrode forming slurry was applied on both surfaces of a positive electrode current collector made of an aluminum foil having a thickness of 15 ⁇ m to form a positive electrode mixture layer. Thereafter, the positive electrode mixture layer was dried at 80 ° C. to form a positive electrode active material layer. Through the above steps, a positive electrode a1 according to Example 1 was produced.
  • the packing density in the positive electrode a1 was 3.9 g / cc.
  • Comparative Example 1 A positive electrode b1 according to Comparative Example 1 was produced in the same manner as in Example 1 except that glycerol as a poor solvent was not added.
  • LiCoO 2 particles, acetylene black (AB) as a conductive agent, and ethyl acetoacetate were kneaded. Thereafter, a mixture of PVDF and ethyl acetoacetate was further added to the kneaded product and stirred at 120 ° C. to prepare a positive electrode forming slurry.
  • the positive electrode forming slurry was applied on both surfaces of a positive electrode current collector made of an aluminum foil having a thickness of 15 ⁇ m to form a positive electrode mixture layer. Thereafter, the positive electrode mixture layer was dried at 80 ° C. to form a positive electrode active material layer.
  • the positive electrode b2 which concerns on the comparative example 2 was produced according to the above process. The packing density in the positive electrode b2 was 3.9 g / cc.
  • Example 2 A positive electrode a2 according to Example 2 was produced in the same manner as the positive electrode a1 according to Example 1 except that the drying temperature was set to 120 ° C.
  • Comparative Example 4 A positive electrode b4 according to Comparative Example 4 was produced in the same manner as the positive electrode a2 according to Example 2, except that glycerol was not added.
  • Comparative Example 5 A positive electrode b5 according to Comparative Example 5 was produced in the same manner as the positive electrode a2 according to Example 2, except that ethylene glycol was added instead of glycerol.
  • Comparative Example 6 A positive electrode b6 according to Comparative Example 6 was produced in the same manner as the positive electrode a2 according to Example 2, except that tetraethylene glycol dimethyl ether was added instead of glycerol.
  • the positive electrodes a1, a2, and b1 to b6 were cut into a size of 50 mm ⁇ 20 mm to prepare a sample for evaluating flexibility. As shown in FIG. 4, both ends of the sample S were attached to an acrylic plate 20 having a width of 30 mm using a double-sided tape (“Nystack NW-20” manufactured by Nichiban Co., Ltd.). Next, the center of the sample S is moved to the center at a constant speed (20 mm / min) using a small desktop testing machine (“FGS-TV” and “FGP-0.5”) manufactured by Nidec Sympo Corporation. Pressing was performed until folding occurred. And the maximum load provided in the pressing process was measured.
  • FGS-TV small desktop testing machine
  • Table 1 shows the maximum loads of the positive electrodes a1, b1 to b3 when the maximum load of the positive electrode b1 according to Comparative Example 1 is normalized as 100.
  • Table 2 shows the maximum loads of the positive electrodes a2, b4 to b6 when the maximum load of the positive electrode b4 according to Comparative Example 4 is normalized as 100.
  • the positive electrode a1 is more flexible than the positive electrode b1.
  • the positive electrode a2 is more flexible than the positive electrode b4. This shows that the softness of the positive electrode can be improved by adding glycerol in addition to NMP.
  • Example 1 The NMP solution in which PVDF was dissolved was applied to the surface of the aluminum foil by a doctor blade method and dried at 80 ° C. to prepare a coating film a. Next, the density of the coating film a was measured. The results are shown in Table 3 below. Moreover, the electron micrograph of the coating film a is shown in FIG.
  • Example 2 The NMP solution in which PVDF was dissolved and NMP to which glycerol was added were mixed by stirring.
  • the mass ratio of NMP to glycerol (NMP: glycerol) in this solution was 98.6: 2.7, and the mass ratio of PVDF to glycerol (PVDF: glycerol) was 100: 20.
  • the above solution was applied to the surface of the aluminum foil by a doctor blade method and dried at 80 ° C. to prepare a coating film b.
  • the density of the coating film b was measured. The results are shown in Table 3 below.
  • the electron micrograph of the coating film b is shown in FIG.
  • Example 3 The above experimental example except that the mass ratio of NMP to glycerol (NMP: glycerol) was 97.3: 5.5 and the mass ratio of PVDF to glycerol (PVDF: glycerol) was 100: 40
  • NMP NMP: glycerol
  • PVDF PVDF
  • Example 3 the density of the coating film c was measured. The results are shown in Table 3 below.
  • the electron micrograph of the coating film c is shown in FIG.
  • Example 4 By stirring PVDF and ethyl acetoacetate at 120 ° C., an ethyl acetoacetate solution in which PVDF was dissolved was obtained. The ethyl acetoacetate solution was applied to the surface of the aluminum foil by a doctor blade method while being kept at 120 ° C., and dried at 80 ° C. to prepare a coating film d. Next, the density of the coating film d was measured. The results are shown in Table 3 below. Moreover, the electron micrograph of the coating film d is shown in FIG.
  • the coating film b and coating film c in which glycerol was added in addition to NMP had more voids and lower density than the coating film a using only NMP.
  • the coating film d using ethyl acetoacetate and the coating film e using dimethylimidazolidinone and cyclohexanone have the same density as the coating film a using NMP, and the void volume is substantially equal. Did not increase.
  • the mass ratio of glycerol to PVDF is preferably 5/100 or more, and more preferably 10/100 or more. It can be seen that 20/100 or more is more preferable.
  • a positive electrode was attached to an acrylic plate of 120 mm ⁇ 30 mm size using a double-sided tape of 70 mm ⁇ 20 mm size (“Nystack NW-20” manufactured by Nichiban Co., Ltd.).
  • the end of the applied positive electrode was placed at 90 ° C. with respect to the surface of the positive electrode active material layer using a small desktop tester (“FGS-TV” and “FGP-5”) manufactured by Nidec Sympo Corporation. In this direction, the film was pulled 55 mm at a constant speed of 50 mm / min, and the strength at the time of peeling was measured.
  • the mass ratio of glycerol to PVDF is preferably 50/100 or less, It can be seen that the ratio is more preferably 40/100 or less.
  • the mass ratio of glycerol to PVDF is preferably 5/100 to 50/100. It can be seen that a value of ⁇ 40 / 100 is more preferable.
  • Example 8 [Production of positive electrode] A positive electrode was produced in the same manner as in Example 2.
  • a slurry for forming a negative electrode was prepared by kneading in an aqueous solution. This negative electrode forming slurry was applied on both sides of a negative electrode current collector made of copper foil, dried, and then rolled to prepare a negative electrode.
  • a lead terminal was attached to each of the positive electrode and the negative electrode, and an electrode body was prepared by pressing a spiral wound through a separator and crushing it into a flat shape.
  • the electrode body was inserted into an aluminum laminate as a battery outer package, and then the non-aqueous electrolyte was injected.
  • the nonaqueous electrolyte secondary battery A according to Example 8 was completed.
  • the battery was designed so that the end-of-charge voltage was 4.4 V and the design capacity was 750 mAh.
  • Comparative Example 7 A battery B according to Comparative Example 7 was produced in the same manner as in Example 8, except that the positive electrode produced in the same manner as in Comparative Example 4 was used.
  • Nonaqueous electrolyte secondary battery 10 Electrode body 11 ... Negative electrode 12 ... Positive electrode 12a ... Positive electrode collector 12b ... Positive electrode active material layer 12c ... Positive electrode mixture layer 13 ... Separator 17 ... Battery container 20 ... Acrylic board

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Abstract

L'invention porte sur un procédé au moyen duquel une électrode positive pour des batteries secondaires à électrolyte non aqueux ayant une excellente flexibilité et une excellente absorption de liquide peut être produite. Ce procédé comprend une étape de formation dans laquelle une couche de matériau actif d'électrode positive (12b) est formée par séchage d'une couche de mélange d'électrode positive (12c) qui est formée par application d'une bouillie sur un collecteur d'électrode positive (12a), ladite bouillie contenant un matériau actif d'électrode positive, un liant qui est formé de fluorure de polyvinylidène et/ou d'une fluororésine ayant une unité de fluorure de polyvinylidène, de la N-méthyl-2-pyrrolidone et un polyol qui présente un point d'ébullition supérieur à celui de la N-méthyl-2-pyrrolidone.
PCT/JP2012/055903 2011-03-15 2012-03-08 Procédé de fabrication d'électrode positive pour batteries secondaires à électrolyte non aqueux, électrode positive pour batteries secondaires à électrolyte non aqueux et batterie secondaire à électrolyte non aqueux Ceased WO2012124582A1 (fr)

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JP2011-056916 2011-03-15

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Cited By (7)

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JP2018190703A (ja) * 2016-12-09 2018-11-29 ユニチカ株式会社 バインダ溶液および塗液ならびに蓄電素子電極の製造方法
WO2019010405A1 (fr) * 2017-07-07 2019-01-10 Ppg Industries Ohio, Inc. Composition de suspension d'électrode pour dispositifs de stockage d'électricité aux ions de lithium
WO2019010366A1 (fr) * 2017-07-07 2019-01-10 Ppg Industries Ohio, Inc. Composition de bouillie de liant d'électrode destinée à des dispositifs de stockage électrique au lithium-ion
JP2019071226A (ja) * 2017-10-10 2019-05-09 日産自動車株式会社 非水電解質二次電池用電極
JP2019071227A (ja) * 2017-10-10 2019-05-09 日産自動車株式会社 非水電解質二次電池用電極
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JP2018190703A (ja) * 2016-12-09 2018-11-29 ユニチカ株式会社 バインダ溶液および塗液ならびに蓄電素子電極の製造方法
US11799086B2 (en) 2017-07-07 2023-10-24 Ppg Industries Ohio, Inc. Electrode binder slurry composition for lithium ion electrical storage devices
WO2019010405A1 (fr) * 2017-07-07 2019-01-10 Ppg Industries Ohio, Inc. Composition de suspension d'électrode pour dispositifs de stockage d'électricité aux ions de lithium
US12463220B2 (en) 2017-07-07 2025-11-04 Ppg Industries Ohio, Inc. Electrode binder slurry composition for lithium ion electrical storage devices
CN110870107A (zh) * 2017-07-07 2020-03-06 Ppg工业俄亥俄公司 用于锂离子储电器件的电极粘结剂浆料组合物
JP2020526882A (ja) * 2017-07-07 2020-08-31 ピーピージー・インダストリーズ・オハイオ・インコーポレイテッドＰＰＧ Ｉｎｄｕｓｔｒｉｅｓ Ｏｈｉｏ，Ｉｎｃ． リチウムイオン蓄電装置用の電極結合剤スラリー組成物
JP2020527830A (ja) * 2017-07-07 2020-09-10 ピーピージー・インダストリーズ・オハイオ・インコーポレイテッドＰＰＧ Ｉｎｄｕｓｔｒｉｅｓ Ｏｈｉｏ，Ｉｎｃ． リチウムイオン蓄電装置用電極結合剤スラリー組成物
AU2018297308B2 (en) * 2017-07-07 2021-09-16 Ppg Industries Ohio, Inc. Electrode binder slurry composition for lithium ion electrical storage devices
TWI754081B (zh) * 2017-07-07 2022-02-01 美商片片堅俄亥俄州工業公司 用於鋰離子蓄電裝置的電極黏結漿料組合物
WO2019010366A1 (fr) * 2017-07-07 2019-01-10 Ppg Industries Ohio, Inc. Composition de bouillie de liant d'électrode destinée à des dispositifs de stockage électrique au lithium-ion
JP7217735B2 (ja) 2017-07-07 2023-02-03 ピーピージー・インダストリーズ・オハイオ・インコーポレイテッド リチウムイオン蓄電装置用の電極結合剤スラリー組成物
US12394797B2 (en) 2017-07-07 2025-08-19 Ppg Industries Ohio, Inc. Electrode slurry composition for lithium ion electrical storage devices
US12191496B2 (en) 2017-07-07 2025-01-07 Ppg Industries Ohio, Inc. Electrode binder slurry composition for lithium ion electrical storage devices
US11424451B2 (en) 2017-07-07 2022-08-23 Ppg Industries Ohio, Inc. Electrode slurry composition for lithium ion electrical storage devices
JP7234199B2 (ja) 2017-07-07 2023-03-07 ピーピージー・インダストリーズ・オハイオ・インコーポレイテッド リチウムイオン蓄電装置用電極結合剤スラリー組成物
US11764361B2 (en) 2017-07-07 2023-09-19 Ppg Industries Ohio, Inc. Electrode slurry composition for lithium ion electrical storage devices
US11777096B2 (en) 2017-07-07 2023-10-03 Ppg Industries Ohio, Inc. Electrode binder slurry composition for lithium ion electrical storage devices
CN110870107B (zh) * 2017-07-07 2024-02-06 Ppg工业俄亥俄公司 用于锂离子储电器件的电极粘结剂浆料组合物
US11843118B2 (en) 2017-07-07 2023-12-12 Ppg Industries Ohio, Inc. Electrode binder slurry composition for lithium ion electrical storage devices
JP7133301B2 (ja) 2017-10-10 2022-09-08 日産自動車株式会社 非水電解質二次電池用電極
JP7145600B2 (ja) 2017-10-10 2022-10-03 日産自動車株式会社 非水電解質二次電池用電極
JP2019071226A (ja) * 2017-10-10 2019-05-09 日産自動車株式会社 非水電解質二次電池用電極
JP2019071227A (ja) * 2017-10-10 2019-05-09 日産自動車株式会社 非水電解質二次電池用電極

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