CN113488652A - Method for improving agglomeration of lithium ion ternary positive electrode slurry - Google Patents
Method for improving agglomeration of lithium ion ternary positive electrode slurry Download PDFInfo
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- CN113488652A CN113488652A CN202110738598.4A CN202110738598A CN113488652A CN 113488652 A CN113488652 A CN 113488652A CN 202110738598 A CN202110738598 A CN 202110738598A CN 113488652 A CN113488652 A CN 113488652A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 26
- 239000011267 electrode slurry Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 20
- 238000005054 agglomeration Methods 0.000 title claims description 14
- 230000002776 aggregation Effects 0.000 title claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 32
- 229920001577 copolymer Polymers 0.000 claims abstract description 31
- 239000007774 positive electrode material Substances 0.000 claims abstract description 27
- 239000006258 conductive agent Substances 0.000 claims abstract description 21
- 229920001519 homopolymer Polymers 0.000 claims abstract description 21
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 19
- 239000002033 PVDF binder Substances 0.000 claims abstract description 18
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 11
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011888 foil Substances 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims description 16
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910013478 LiNixCoyMzO2 Inorganic materials 0.000 claims description 3
- 229910011322 LiNi0.6Mn0.2Co0.2O2 Inorganic materials 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 19
- 239000010406 cathode material Substances 0.000 abstract description 16
- 239000000853 adhesive Substances 0.000 abstract description 14
- 230000001070 adhesive effect Effects 0.000 abstract description 14
- 238000004537 pulping Methods 0.000 abstract description 8
- 235000015110 jellies Nutrition 0.000 abstract description 6
- 239000008274 jelly Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 4
- 241001391944 Commicarpus scandens Species 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910013716 LiNi Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- -1 oxygen ions Chemical class 0.000 description 2
- 239000006245 Carbon black Super-P Substances 0.000 description 1
- 229910020784 Co0.2O2 Inorganic materials 0.000 description 1
- 229910019549 CoyMzO2 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
- 239000006230 acetylene black Substances 0.000 description 1
- NDPGDHBNXZOBJS-UHFFFAOYSA-N aluminum lithium cobalt(2+) nickel(2+) oxygen(2-) Chemical compound [Li+].[O--].[O--].[O--].[O--].[Al+3].[Co++].[Ni++] NDPGDHBNXZOBJS-UHFFFAOYSA-N 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 239000002134 carbon nanofiber Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
-
- 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
Abstract
The invention belongs to the field of lithium ion batteries, and relates to a high polymer (Copolymer) used as an adhesive in pulping of a lithium ion high nickel ternary cathode material. Dispersing the high molecular copolymer in N-methyl pyrrolidone, sequentially adding a conductive carbon black conductive agent, a carbon nanotube conductive agent and a high-nickel ternary positive electrode material, and stirring to obtain positive electrode slurry; coating the anode electrode slurry on an aluminum foil, and baking in a vacuum oven to obtain an anode plate; the high molecular copolymer is a polyvinylidene fluoride homopolymer. The high-molecular copolymer can effectively improve that when the high-nickel ternary cathode material is used for pulping on a cathode, the pulp does not generate a jelly shape and can be coated smoothly. And the adhesive force of the slurry cannot be increased, so that the brittleness of the polar plate cannot be increased, and the polar plate is not easy to break when the positive polar plate is rolled, cut and wound to influence the production.
Description
Technical Field
The patent belongs to the field of lithium ion batteries, and particularly relates to a method for improving agglomeration of lithium ion ternary positive electrode slurry.
Background
In order to improve the volume energy density of the lithium ion battery, the simplest method is to replace the anode material of the lithium ion battery. The lithium ion battery anode material mainly influences the energy density, cycle life, high-temperature storage performance and the like of the lithium ion battery, and is the most important material in the lithium ion battery. High nickel ternary positive electrode material (chemical formula is LiNi)xCoyMzO2Wherein 0 is<X<1，0<Y<1，0<Z<1. M is Mn or Al (NMC if M ═ Mn, or NCA if M ═ Al)) not only has the characteristics of high energy density, good thermal stability, low cost, high safety, and the like, and has been used as a positive electrode material with high energy density. The binder functions to bind together particles of various sizes and shapes in the battery paste, and is an important component in lithium ion batteries. The binder used in the cathode material is Polyvinylidene fluoride Homopolymer (Polyvinylidene difluoride Homopolymer). However, for high nickel ternary positive electrode materials (such as NMC622, NMC811 or NCA), when exposed to air, spontaneous reaction occurs on the particle surface, and nickel trivalent (Ni) remains on the surface3+) Will be converted into nickel (Ni) II2+) Liberating oxygen ions (O)2-) Oxygen ion (O)2-) Will absorb carbon dioxide (CO) in the air2) And water (H)2O) to produce lithium hydroxide (LiOH) and lithium carbonate (Li)2CO3) The reaction formula is as follows:
excessive alkaline substances can cause the pH value of the slurry to be too high, and the alkaline substances on the surface of the material can attack C-F and C-H bonds of the polyvinylidene fluoride homopolymer, so that the polyvinylidene fluoride homopolymer generates bimolecular elimination reaction, a part of carbon-carbon double bonds can be formed on a molecular chain, the viscosity can be increased at the moment, and finally the slurry is jellified and cannot be coated. In addition, when the adhesive force of the slurry is increased, the brittleness of the positive electrode plate is easily increased, and the positive electrode plate is easily broken when being rolled, cut and wound to influence the production.
Disclosure of Invention
The invention provides a method for improving agglomeration of lithium ion ternary positive electrode slurry, wherein a high molecular copolymer used in pulping of a high-nickel ternary positive electrode material of a lithium ion battery is used as an adhesive, and the slurry can not generate a jelly shape and can be coated smoothly. And the adhesive force of the slurry cannot be increased, so that the brittleness of the polar plate cannot be increased, and the polar plate is not easy to break when the positive polar plate is rolled, cut and wound to influence the production.
Dispersing a high molecular copolymer in N-methyl pyrrolidone, sequentially adding a conductive carbon black conductive agent, a carbon nanotube conductive agent and a high-nickel ternary positive electrode material, and stirring to obtain positive electrode slurry; coating the anode electrode slurry on an aluminum foil, and baking in a vacuum oven to obtain an anode plate; the high molecular copolymer is a polyvinylidene fluoride homopolymer.
Furthermore, the polymer copolymer is a homopolymer consisting of C-F and C-H bonds, and a polymer with a C-X bond is added.
Furthermore, the adding time interval of each substance of the conductive carbon black conductive agent, the carbon nanotube conductive agent and the high-nickel ternary cathode material is 2 hours.
Further, after coating the anode electrode slurry on an aluminum foil, baking the aluminum foil in a vacuum oven at 80 ℃ for 10 hours to obtain an anode plate.
Further, the mass ratio of the polymer copolymer to NMP was 5: 95.
Further, the dispersing step is as follows: the high molecular copolymer was added to NMP and heated at a temperature of 49 ℃ for one hour.
Furthermore, the mass ratio of the conductive carbon black conductive agent, the carbon nanotube conductive agent, the high-nickel ternary positive electrode material and the high polymer copolymer is 1-5:1-5:1-5: 95-99.
Furthermore, the chemical formula of the high-nickel ternary cathode material is LiNixCoyMzO2Wherein 0 is<X<1，0<Y<1，0<Z<1; m may be Mn or Al.
Further, the high-nickel ternary cathode material can be NMC622 or NMC811, and the NMC622 chemical formula is LiNi0.6Mn0.2Co0.2O2(ii) a The NMC811 chemical formula is LiNi0.8Mn0.8Co0.1O2。
The invention also provides a lithium ion battery anode plate which is prepared by any one of the methods.
Advantageous effects
Generally, polyvinylidene fluoride homopolymer is used as an adhesive in pulping of a cathode material on the market, however, when the cathode material is a high-nickel ternary cathode material, due to an excessively high slurry PH value (PH value 11-12), alkaline substances on the surface of the high-nickel ternary material attack C-F and C-H bonds of the polyvinylidene fluoride homopolymer to generate a bridging reaction (CH ═ CF-CH ═ CF double bond structure), and finally, the cathode material is in a jelly shape and cannot be coated. In addition, the increased adhesion of the slurry easily increases the brittleness of the positive electrode plate, and the positive electrode plate is easily broken at the R-angle during rolling, slitting and winding, so that the positive electrode plate cannot be produced.
The invention introduces a high molecular material as an adhesive, and adds a high molecular material with a C-X bond on the basis of the traditional PVDF homopolymer adhesive (consisting of C-F and C-H bonds) to form a high molecular copolymer, wherein the high molecular material accounts for 1 to 100 percent of the weight of the adhesive, and the sum of the weight percent of the adhesive is 100.
The copolymer monomer can inhibit bimolecular elimination caused by alkaline substances generated when the high nickel ternary cathode material is exposed to air, and can interrupt the bridging reaction (CH ═ CF-CX) generated when the traditional PVDF is used2-CX2-CH＝CF-CX2CX2), so that the positive electrode slurry can not be jellified in the positive electrode pulping process.
The high-molecular copolymer can effectively improve that when the high-nickel ternary cathode material is used for pulping on a cathode, the pulp does not generate a jelly shape and can be coated smoothly. And the adhesive force of the slurry cannot be increased, so that the brittleness of the polar plate cannot be increased, and the polar plate is not easy to break when the positive polar plate is rolled, cut and wound to influence the production.
Drawings
FIG. 1 is a schematic diagram of a positive electrode material slurry and a positive electrode material plate; (a) mixing the obtained NMC622 positive electrode material slurry by using PVDF homopolymer; (b) mixing the obtained NMC622 positive electrode material slurry with a high molecular copolymer; (c) mixing the obtained NMC622 positive electrode plate with PVDF homopolymer; (d) the obtained NMC622 positive electrode material plate is mixed with a high molecular copolymer.
FIG. 2 is a structural formula of a high molecular copolymer.
Detailed Description
Example 1
A method for improving agglomeration of lithium ion ternary positive electrode slurry adopts a high molecular copolymer as an adhesive, wherein the high molecular copolymer is a polyvinylidene fluoride homopolymer, and a C-X bond polymer is added on the traditional PVDF (a homopolymer consisting of C-F bonds and C-H bonds) so as to form the high molecular copolymer. The weight percentage of the high polymer material in the adhesive is 1-100%, the rest is NMP solvent, and the adhesive and NMP are firstly beaten into colloid when the battery is manufactured.
Further, a method for improving agglomeration of lithium ion ternary positive electrode slurry comprises the following steps:
firstly, dispersing a high molecular copolymer in N-Methyl Pyrrolidone (N-Methyl-2-Pyrrolidone, NMP for short), then sequentially adding a conductive carbon black conductive agent, a carbon nanotube conductive agent and a high-nickel ternary positive electrode material, stirring, wherein the adding interval time of each substance is 2 hours, the revolution speed is 20-40r/min, the rotation speed is 1000-2500r/min, adding the last substance of the high-nickel ternary positive electrode material, and then stirring for 1-2 hours to obtain positive electrode slurry.
And (3) coating the anode slurry on an aluminum foil, and baking for 10 hours in a vacuum oven at 80 ℃ to obtain an anode plate.
The polymer copolymer is a homopolymer composed of C-F and C-H bonds, and a polymer with C-X bonds is added to form a polymer copolymer. The structural formula of the high-molecular copolymer is shown in figure 2.
The mass ratio of the high molecular copolymer to the NMP is 5: 95;
the dispersion step is as follows: adding the high molecular copolymer to NMP and heating at a temperature of 49 ℃ for one hour;
the mass ratio of the conductive carbon black conductive agent, the carbon nanotube conductive agent, the high-nickel ternary positive electrode material and the high polymer is 1-5:1-5:1-5: 95-99;
the chemical formula of the high-nickel ternary cathode material is LiNixCoyMzO2Wherein 0 is<X<1，0<Y<1，0<Z<1. M can be Mn or Al; if M ═ Mn, the high Nickel ternary positive electrode material is NCM (Lithium Nickel Cobalt manganese Oxide), and if M ═ Al, the high Nickel ternary positive electrode material is NCA (Lithium Nickel Cobalt Aluminum Oxide);
preferably, the high-nickel ternary cathode material may be NMC622 (chemical formula is LiNi)0.6Mn0.2Co0.2O2) Or NMC811 (formula LiNi)0.8Mn0.8Co0.1O2). The high nickel ternary cathode material used in this embodiment is NMC 622.
The conductive carbon black conductive agent is SuperP, ECP, acetylene black or VGCF (Vapor Grown Graphite Tube).
Preferably, the conductive carbon black-based conductive agent is conductive carbon black Super P.
Preferably, the carbon nanotube-based conductive agent is carbon nanotube CNT.
250mL of the positive electrode slurry prepared in the above step was placed in a normal atmosphere (25 ℃ C.) and the slurry condition was observed.
Fig. 1(a) shows an NMC622 positive electrode material slurry obtained by mixing a polymer copolymer, and fig. 1(b) shows an NMC622 positive electrode material slurry obtained by mixing a PVDF homopolymer. Observing the slurry state, it can be seen from fig. 1(a) that the NMC622 positive electrode material slurry obtained by using the high molecular copolymer has a smooth surface and no particles, whereas the NMC622 positive electrode material slurry obtained by using the PVDF homopolymer (fig. 1(b)) has a jelly shape and cannot be coated on line, showing that the high molecular copolymer can inhibit the high nickel ternary positive electrode from generating the jelly shape in the slurry mixing process.
Fig. 1(c) shows a NMC622 positive electrode plate obtained by kneading a polymer copolymer, and fig. 1(d) shows a NMC622 positive electrode material plate obtained by kneading a PVDF homopolymer. And two polar plates are placed on a table, one end of each polar plate naturally droops at 90 degrees, and then the flexibility of the polar plates is observed. It can be found that the positive electrode plate made of the high molecular copolymer has no crack at the bent part, while the positive electrode plate made of the PVDF homopolymer has cracks at the bent part. The experimental results show that the electrode plate made of the high molecular copolymer has higher flexibility.
In summary, the above results show that when the high nickel ternary cathode material is used for pulping, the use of the high molecular copolymer as the binder can not only effectively inhibit the formation of jelly-like shape during pulping, but also improve the flexibility of the electrode plate.
Claims (10)
1. A method for improving agglomeration of lithium ion ternary positive electrode slurry is characterized in that after a high molecular copolymer is dispersed in N-methyl pyrrolidone, a conductive carbon black conductive agent, a carbon nanotube conductive agent and a high-nickel ternary positive electrode material are sequentially added and stirred to obtain positive electrode slurry; coating the anode electrode slurry on an aluminum foil, and baking in a vacuum oven to obtain an anode plate; the high molecular copolymer is a polyvinylidene fluoride homopolymer.
2. The method for improving agglomeration of a lithium ion ternary positive electrode slurry according to claim 1, wherein the polymer copolymer is a homopolymer consisting of C-F and C-H bonds, and a polymer having a C-X bond is further added.
3. The method as claimed in claim 1, wherein the interval between the addition of each of the conductive carbon black conductive agent, the carbon nanotube conductive agent and the high-nickel ternary positive electrode material is 2 hours.
4. The method for improving the agglomeration of the lithium ion ternary positive electrode slurry according to claim 1, wherein the positive electrode slurry is coated on an aluminum foil and then baked in a vacuum oven at 80 ℃ for 10 hours to obtain a positive electrode plate.
5. The method for improving agglomeration of a lithium ion ternary positive electrode slurry according to claim 1, wherein the mass ratio of the high molecular copolymer to NMP is 5: 95.
6. The method for improving agglomeration of a lithium ion ternary positive electrode slurry according to claim 1, wherein the dispersing step is: the high molecular copolymer was added to NMP and heated at a temperature of 49 ℃ for one hour.
7. The method for improving agglomeration of lithium ion ternary positive electrode slurry according to claim 1, wherein the mass ratio of the conductive carbon black conductive agent, the carbon nanotube conductive agent, the high nickel ternary positive electrode material and the high molecular copolymer is 1-5:1-5:1-5: 95-99.
8. The method for improving agglomeration of a lithium-ion ternary positive electrode slurry of claim 1, wherein the high-nickel ternary positive electrode material has the chemical formula LiNixCoyMzO2Wherein 0 is<X<1，0<Y<1，0<Z<1; m may be Mn or Al.
9. The method for improving agglomeration of a lithium ion ternary positive electrode slurry according to claim 1,the high-nickel ternary positive electrode material can be NMC622 or NMC811, and the chemical formula of the NMC622 is LiNi0.6Mn0.2Co0.2O2(ii) a The NMC811 chemical formula is LiNi0.8Mn0.8Co0.1O2。
10. A positive electrode plate of a lithium ion battery, which is prepared by the method of any one of claims 1 to 9.
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| US20110318638A1 (en) * | 2009-02-12 | 2011-12-29 | Daikin Industries, Ltd. | Positive electrode mixture slurry for lithium secondary batteries, and positive electrode and lithium secondary battery that use said slurry |
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| CN108336355A (en) * | 2017-01-17 | 2018-07-27 | 中航锂电（洛阳）有限公司 | A kind of lithium ion battery anode glue size and preparation method thereof |
| CN109713306A (en) * | 2018-11-28 | 2019-05-03 | 桑德集团有限公司 | Binder, anode sizing agent and preparation method thereof, lithium ion battery |
| CN112952092A (en) * | 2019-12-10 | 2021-06-11 | 惠州比亚迪电池有限公司 | Positive electrode binder and preparation method thereof, positive electrode slurry, positive electrode and lithium ion battery |
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- 2021-06-30 CN CN202110738598.4A patent/CN113488652A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110318638A1 (en) * | 2009-02-12 | 2011-12-29 | Daikin Industries, Ltd. | Positive electrode mixture slurry for lithium secondary batteries, and positive electrode and lithium secondary battery that use said slurry |
| CN106299249A (en) * | 2016-08-21 | 2017-01-04 | 合肥国轩高科动力能源有限公司 | A kind of method suppressing nickelic ternary material to close slurry gel and raising Stability of Slurry |
| CN108336355A (en) * | 2017-01-17 | 2018-07-27 | 中航锂电（洛阳）有限公司 | A kind of lithium ion battery anode glue size and preparation method thereof |
| CN109713306A (en) * | 2018-11-28 | 2019-05-03 | 桑德集团有限公司 | Binder, anode sizing agent and preparation method thereof, lithium ion battery |
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