CN117038911A - Positive electrode active material of lithium ion battery, positive electrode plate and lithium ion battery - Google Patents
Positive electrode active material of lithium ion battery, positive electrode plate and lithium ion battery Download PDFInfo
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- CN117038911A CN117038911A CN202311092444.8A CN202311092444A CN117038911A CN 117038911 A CN117038911 A CN 117038911A CN 202311092444 A CN202311092444 A CN 202311092444A CN 117038911 A CN117038911 A CN 117038911A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 48
- 239000007774 positive electrode material Substances 0.000 title claims abstract description 29
- 239000011149 active material Substances 0.000 claims abstract description 103
- 239000013543 active substance Substances 0.000 claims abstract description 9
- 239000011572 manganese Substances 0.000 claims abstract description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 3
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 239000010450 olivine Substances 0.000 claims abstract description 3
- 229910052609 olivine Inorganic materials 0.000 claims abstract description 3
- 239000010452 phosphate Substances 0.000 claims abstract description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 3
- 229910000314 transition metal oxide Inorganic materials 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 4
- 229910052727 yttrium Inorganic materials 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims description 2
- 239000006258 conductive agent Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 96
- 238000002156 mixing Methods 0.000 description 91
- 239000011248 coating agent Substances 0.000 description 76
- 238000000576 coating method Methods 0.000 description 76
- 239000002002 slurry Substances 0.000 description 76
- 229910052782 aluminium Inorganic materials 0.000 description 57
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 57
- 239000011888 foil Substances 0.000 description 57
- 238000004804 winding Methods 0.000 description 57
- 238000000034 method Methods 0.000 description 41
- 229910052799 carbon Inorganic materials 0.000 description 40
- 238000001035 drying Methods 0.000 description 40
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 38
- 239000011889 copper foil Substances 0.000 description 38
- 239000011265 semifinished product Substances 0.000 description 38
- 239000007787 solid Substances 0.000 description 38
- 238000012546 transfer Methods 0.000 description 38
- 229910021393 carbon nanotube Inorganic materials 0.000 description 37
- 239000002041 carbon nanotube Substances 0.000 description 37
- 239000003792 electrolyte Substances 0.000 description 21
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 20
- 239000002033 PVDF binder Substances 0.000 description 19
- 229910021383 artificial graphite Inorganic materials 0.000 description 19
- 230000015572 biosynthetic process Effects 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000002184 metal Substances 0.000 description 19
- 239000002985 plastic film Substances 0.000 description 19
- 229920006255 plastic film Polymers 0.000 description 19
- 239000000843 powder Substances 0.000 description 19
- 238000012545 processing Methods 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 238000003466 welding Methods 0.000 description 19
- 239000008367 deionised water Substances 0.000 description 18
- 229910021641 deionized water Inorganic materials 0.000 description 18
- GBCAVSYHPPARHX-UHFFFAOYSA-M n'-cyclohexyl-n-[2-(4-methylmorpholin-4-ium-4-yl)ethyl]methanediimine;4-methylbenzenesulfonate Chemical compound CC1=CC=C(S([O-])(=O)=O)C=C1.C1CCCCC1N=C=NCC[N+]1(C)CCOCC1 GBCAVSYHPPARHX-UHFFFAOYSA-M 0.000 description 18
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 6
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 1
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Composite Materials (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive electrode active material of a lithium ion battery, a positive electrode plate and a lithium ion battery, wherein the positive electrode active material comprises a first active material, a second active material and a third active material; the first active material is lithium manganate, the second active material is high-nickel transition metal oxide, and the third active material is high-manganese lithium-containing phosphate with an olivine structure; the positive electrode active material comprises the following components in percentage by mass: 30-70% of a first active substance; 20-40% of a second active material; 10-30% of a third active material. The sum of the mass percentages of the three active substances is 100%, and the mass percentage end values of the three active substances cannot be simultaneously obtained. The invention skillfully utilizes different positive electrode materials to generate the best effect under an optimal proportion, and finally achieves a very good capacity retention rate of the battery at low temperature.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery positive electrode active material, a positive electrode plate and a lithium ion battery.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In recent years, the sales of electric automobiles are better and better, and the electric automobiles contribute a strength for low-carbon life. However, the current battery positive electrode plate mainly consists of a single lithium iron phosphate or lithium nickel cobalt manganese oxide material and mainly has the problems of poor capacity retention, poor charging capacity and the like at low temperature. The poor capacity retention at low temperature mainly has the problems that the structure of the positive electrode material restricts the diffusion speed of lithium ions, the high-melting point solvent in the solvent of the electrolyte has a solidification phenomenon at low temperature, so that the transmission speed of the lithium ions in the electrolyte is reduced, the diffusion speed of the lithium ions in graphite at low temperature is reduced, and the like, and the problem of low temperature needs to be solved from the structure of the positive electrode material of the lithium ion battery.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a positive electrode active material of a lithium ion battery, a positive electrode plate and the lithium ion battery.
To achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
a positive electrode active material for a lithium ion battery, comprising: a first active material, a second active material, and a third active material;
the first active material is lithium manganate, the second active material is high-nickel transition metal oxide, and the third active material is high-manganese lithium-containing phosphate with an olivine structure;
the positive electrode active material comprises the following components in percentage by mass: 30-70% of a first active substance; 20-40% of a second active material; 10-30% of a third active material; the sum of the mass percentages of the three active substances is 100%, and the mass percentage end values of the three active substances cannot be simultaneously obtained.
Further, the first active material has a chemical formula: li (Li) a1 Mn x1 N y1 O 4
Wherein a1 is more than or equal to 0.8 and less than or equal to 1.2, x1 is more than or equal to 0 and less than or equal to 2, y1 is more than or equal to 0 and less than or equal to 2, x1+y1=2, and N is at least one type of element selected from Mg, ln, ca, ce, Y, al, sn, ti, zr, W, sr, la, ba, co, mo, cr and/or B.
Further, the second active material has a chemical formula:
Li a2 (Ni x2 Co y2 Mn z2 M b2 )O 2-c2 N c2
wherein a2 is more than or equal to 0.8 and less than or equal to 1.2,0.7, x2 is more than or equal to 1, y2 is more than or equal to 0 and less than or equal to 0.2, z2 is more than or equal to 0 and less than or equal to 0.2, B2 is more than or equal to 0 and less than or equal to 0.1, c2 is more than or equal to 0 and less than or equal to 0.1, x2+y2+z2+b2=1, and M is at least one of Mg, ca, ce, Y, al, sn, ti, zr, W, sr, la, ba, co, mo, cr and B; n is at least one element of N, F, S, cl, br and I.
Further, the third active material has a chemical formula: li (Li) a3 Fe x3 Mn y3 M z3 o 4
Wherein a3 is more than or equal to 0.9 and less than or equal to 1.1, x3 is more than or equal to 0 and less than or equal to 1, y3 is more than or equal to 0 and less than or equal to 1, z3 is more than or equal to 0 and less than or equal to 0.3, x3+y3+z3=1, and M is one or more of Mg and Ti.
Further, the particle size of the first active material satisfies Dv10.gtoreq.3 μm, dv50.ltoreq.20μm, dv90.ltoreq.50μm; the particle size of the second active material meets the requirement that Dv10 is more than or equal to 3 mu m, dv50 is more than or equal to 6 mu m and less than or equal to 18 mu m, and Dv90 is more than or equal to 30 mu m; the particle size of the third active material satisfies Dv10.gtoreq.0.2 μm, dv50.gtoreq.1.5 μm, dv90.gtoreq.20 μm;
the first active material particles are monocrystalline or polycrystalline in morphology, the second active material particles are monocrystalline or polycrystalline or are obtained by mixing monocrystalline and polycrystalline, and the third active material particles are monocrystalline or secondary spheres.
The positive electrode plate of the lithium ion battery comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer comprises the positive electrode active material.
Further, in the positive electrode membrane except the positive electrode current collector, the mass percentage of the positive electrode active material is 90-99 wt%; the positive electrode membrane also comprises a conductive agent, a binder and an additive.
The lithium ion battery uses the positive electrode plate provided by the invention, and the compaction of the positive electrode plate is 2.5g/cm 3 ～3.3g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The stripping force of the positive pole piece is 5-20N.
The one or more of the above technical solutions have the following beneficial effects:
the existing lithium iron phosphate has very low capacity retention rate at low temperature, and the endurance of the electric automobile at low temperature can be doubled; the capacity retention of the ternary battery is slightly higher than that of lithium iron phosphate but is about 6 folds at low temperature. The invention skillfully utilizes the characteristics of different anode materials and has the best low-temperature performance under the condition of ensuring the energy density and the safety. The voltage platform of lithium manganate is similar to that of a ternary high-nickel material, the lithium manganate provides good low-temperature performance, the ternary high-nickel material provides good capacity to improve the problem that the capacities of lithium manganate and lithium iron manganese phosphate are low, and the lithium iron manganese phosphate has two discharge platforms of 4.0V and 3.0V in a full battery, so that the discharge platform is provided under low SOC, a certain low-temperature performance is improved, and the best effect is generated under the optimal proportion. Finally, the battery has very good capacity retention rate at low temperature.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a diagram of example 1.
Detailed Description
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
The experimental methods used in the following examples are all conventional methods unless otherwise specified; the reagents, materials, etc. used in the examples described below are commercially available unless otherwise specified.
Example 1
Mixing the first active material, the second active material and the third active material according to the mass ratio of 5:3:2, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 2
Mixing the first active material, the second active material and the third active material according to the mass ratio of 4:4:2, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 3
Mixing the first active material, the second active material and the third active material according to the mass ratio of 5:2:3, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry is coated on one side of an aluminum foil with the thickness of 12 micrometers by using a transfer coater, and is dried, and the unit area is maintainedThe weight of the coating after drying was 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 4
Mixing the first active material, the second active material and the third active material according to the mass ratio of 3:4:3, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 5
Mixing the first active material, the second active material and the third active material according to the mass ratio of 6:3:1, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 6
Mixing the first active material, the second active material and the third active material according to the mass ratio of 4.5:3.5:2, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry is coated on one side of an aluminum foil with the thickness of 12 micrometers by using a transfer coater, and is dried, and the coating per unit area is maintainedThe layer weight after drying was 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 7
Mixing the first active material, the second active material and the third active material according to the mass ratio of 3.5:3.5:3, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Example 8
Mixing the first active material, the second active material and the third active material according to the mass ratio of 4:3:3, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 1
And (3) mixing the high-nickel active material powder, the conductive carbon, the carbon nano tube and the PVDF according to the mass part ratio of 94:2:1:3 by using a pure ternary material, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 12.5mg/cm 2 . Then the other side of the aluminum foil is adoptedAnd coating and drying in the same procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 6mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 2
Mixing high-nickel active material powder, conductive carbon, carbon nano tubes and PVDF (polyvinylidene fluoride) in a mass part ratio of 94:2:1:3 by using an LFP material, and then adding NMP (N-methyl pyrrolidone) into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR in a mass part ratio of 90:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.25mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 3
Mixing the first active material, the second active material and the third active material according to the mass ratio of 3:3:4, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 4
Mixing the first active material, the second active material and the third active material according to the mass ratio of 2:5:3, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 5
Mixing the first active material, the second active material and the third active material according to the mass ratio of 1:2:7, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 6
Mixing the first active material and the second active material according to the mass ratio of 5:5, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 7
Mixing the second active material and the third active material according to the mass ratio of 5:5, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Artificial graphite powder, conductive carbon and carbon nanometerThe pipe, CMC and SBR are mixed according to the mass part ratio of 93:2:2:3, and deionized water is added into a high-speed stirrer and evenly mixed into slurry with the solid content of 48 percent. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 8
Mixing the first active material and the third active material according to the mass ratio of 5:5, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 9
Mixing the second active material and the third active material according to the mass ratio of 7:3, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 10
Mixing the first active material and the second active material according to the mass ratio of 3:7, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tube, CMC and SBR in the mass ratio of 93:2:2:3, and then at high speedDeionized water was added to the mixer and mixed uniformly to form a slurry having a solids content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
Comparative example 11
Mixing the first active material and the third active material according to the mass ratio of 3:7, mixing the mixed active material powder, conductive carbon, carbon nano tubes and PVDF according to the mass ratio of 94:2:1:3, and then adding NMP into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 45-80%. The slurry was applied to one side of an aluminum foil having a thickness of 12 μm using a transfer coater and dried, keeping the weight of the dried coating per unit area at 17.5mg/cm 2 . And then coating and drying the other side of the aluminum foil by adopting the same working procedure to obtain a semi-finished product of the positive electrode plate.
Mixing artificial graphite powder, conductive carbon, carbon nano tubes, CMC and SBR according to the mass part ratio of 93:2:2:3, and then adding deionized water into a high-speed stirrer and uniformly mixing to obtain slurry with the solid content of 48%. The slurry was applied to one side of a copper foil having a thickness of 8 μm using a transfer coater, and dried, keeping the weight of the dried coating per unit area at 8.5mg/cm 2 . And then coating and drying the other side of the copper foil by adopting the same procedure to obtain a semi-finished product of the negative electrode plate.
And processing and welding the exposed metal foil part of the pole piece into a pole lug, and then winding the pole lug and the isolating film to form a winding core. And (3) wrapping the winding core by using an aluminum plastic film to prepare a semi-finished battery core, then injecting electrolyte, and carrying out formation and capacity division steps to obtain the finished lithium ion battery.
The testing process comprises the following steps: constant volume at normal temperature 1) standing for 5min; 2) 1C DC to 2.5V; 3) Standing for 30min; 4) 1C CC to 4.2V and cv to 0.05C; 5) Standing for 30min; 6) 1C DC to 2.5V; 7) Standing for 30min. Step 6 is denoted as C0.
Low temperature capacity test: 1) Standing for 5min; 2) 1C0 CC to 4.2V and CV to 0.05C0 25 ℃; 3) Regulating the temperature to-30deg.C, and standing for 240min; 4) 1C0 DC to 2.0V; 5) Standing for 30min; capacity retention = low temperature capacity test step 4 capacity/normal temperature constant volume step 6 capacity.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. A positive electrode active material for a lithium ion battery, comprising: the positive electrode active material includes a first active material, a second active material, and a third active material;
the first active material is lithium manganate, the second active material is high-nickel transition metal oxide, and the third active material is high-manganese lithium-containing phosphate with an olivine structure;
the positive electrode active material comprises the following components in percentage by mass: 30-70% of a first active substance; 20-40% of a second active material; 10-30% of a third active material; the sum of the mass percentages of the three active substances is 100%, and the mass percentage end values of the three active substances cannot be simultaneously obtained.
2. The positive electrode active material for lithium ion battery according to claim 1, characterized in thatThe chemical formula of the first active material is: li (Li) a1 Mn x1 N y1 O 4
Wherein a1 is more than or equal to 0.8 and less than or equal to 1.2, x1 is more than or equal to 0 and less than or equal to 2, y1 is more than or equal to 0 and less than or equal to 2, x1+y1=2, and N is at least one type of element selected from Mg, ln, ca, ce, Y, al, sn, ti, zr, W, sr, la, ba, co, mo, cr and/or B.
3. The positive electrode active material of a lithium ion battery according to claim 1, wherein the second active material has a chemical formula: li (Li) a2 (Ni x2 Co y2 Mn z2 M b2 )O 2 - c2 N c2
Wherein a2 is more than or equal to 0.8 and less than or equal to 1.2,0.7, x2 is more than or equal to 1, y2 is more than or equal to 0 and less than or equal to 0.2, z2 is more than or equal to 0 and less than or equal to 0.2, B2 is more than or equal to 0 and less than or equal to 0.1, c2 is more than or equal to 0 and less than or equal to 0.1, x2+y2+z2+b2=1, and M is at least one of Mg, ca, ce, Y, al, sn, ti, zr, W, sr, la, ba, co, mo, cr and B; n is at least one of N, F, S, cl, br and I.
4. The positive electrode active material for a lithium ion battery according to claim 1, wherein the third active material has a chemical formula: li (Li) a3 Fe x3 Mn y3 M z3 o 4
Wherein a3 is more than or equal to 0.9 and less than or equal to 1.1, x3 is more than or equal to 0 and less than or equal to 1, y3 is more than or equal to 0 and less than or equal to 1, z3 is more than or equal to 0 and less than or equal to 0.3, x3+y3+z3=1, and M is one or more of Mg and Ti.
5. The positive electrode active material for a lithium ion battery according to claim 1, wherein the particle diameter of the first active material satisfies Dv10.gtoreq.3 μm, dv50.ltoreq.20μm, dv90.ltoreq.50μm.
6. The positive electrode active material for a lithium ion battery according to claim 1, wherein the particle diameter of the second active material satisfies Dv10.gtoreq.3 μm, dv50.ltoreq.18 μm, dv90.ltoreq.30 μm.
7. The positive electrode active material for a lithium ion battery according to claim 1, wherein the particle diameter of the third active material satisfies Dv10.gtoreq.0.2. Mu.m, dv50.ltoreq.1.5. Mu.m, dv90.ltoreq.20. Mu.m.
8. A positive electrode sheet for a lithium ion battery, comprising a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprising the positive electrode active material according to any one of claims 1 to 7.
9. The positive electrode plate of the lithium ion battery according to claim 8, wherein the mass percentage of the positive electrode active material in the positive electrode film except the positive electrode current collector is 90-99 wt%; the positive electrode membrane also comprises a conductive agent, a binder and an additive.
10. A lithium ion battery, characterized in that it uses the positive electrode sheet according to any one of claims 8 to 9.
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