CN114665092B - Positive electrode slurry composition, positive electrode slurry, positive electrode plate and secondary battery thereof - Google Patents
Positive electrode slurry composition, positive electrode slurry, positive electrode plate and secondary battery thereof Download PDFInfo
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- CN114665092B CN114665092B CN202011525741.3A CN202011525741A CN114665092B CN 114665092 B CN114665092 B CN 114665092B CN 202011525741 A CN202011525741 A CN 202011525741A CN 114665092 B CN114665092 B CN 114665092B
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- 239000011267 electrode slurry Substances 0.000 title claims abstract description 63
- 239000000203 mixture Substances 0.000 title claims abstract description 30
- 239000011230 binding agent Substances 0.000 claims abstract description 40
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011149 active material Substances 0.000 claims abstract description 28
- 239000002270 dispersing agent Substances 0.000 claims abstract description 20
- 239000000080 wetting agent Substances 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 18
- -1 amino alcohol compound Chemical class 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 229920002678 cellulose Polymers 0.000 claims abstract description 12
- 239000001913 cellulose Substances 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims description 35
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 229920001577 copolymer Polymers 0.000 claims description 22
- 150000003949 imides Chemical group 0.000 claims description 17
- 239000012747 synergistic agent Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 239000002033 PVDF binder Substances 0.000 claims description 9
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 9
- RLJDSHNOFWICBY-UHFFFAOYSA-N [P]=O.[Fe].[Li] Chemical compound [P]=O.[Fe].[Li] RLJDSHNOFWICBY-UHFFFAOYSA-N 0.000 claims description 7
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004962 Polyamide-imide Substances 0.000 claims description 5
- 239000004697 Polyetherimide Substances 0.000 claims description 5
- 229920002301 cellulose acetate Polymers 0.000 claims description 5
- 229920002312 polyamide-imide Polymers 0.000 claims description 5
- 229920001601 polyetherimide Polymers 0.000 claims description 5
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 4
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 claims description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims description 4
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims description 4
- KXJGSNRAQWDDJT-UHFFFAOYSA-N 1-acetyl-5-bromo-2h-indol-3-one Chemical compound BrC1=CC=C2N(C(=O)C)CC(=O)C2=C1 KXJGSNRAQWDDJT-UHFFFAOYSA-N 0.000 claims description 3
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 3
- GIAFURWZWWWBQT-UHFFFAOYSA-N 2-(2-aminoethoxy)ethanol Chemical compound NCCOCCO GIAFURWZWWWBQT-UHFFFAOYSA-N 0.000 claims description 3
- MWGATWIBSKHFMR-UHFFFAOYSA-N 2-anilinoethanol Chemical compound OCCNC1=CC=CC=C1 MWGATWIBSKHFMR-UHFFFAOYSA-N 0.000 claims description 3
- BLFRQYKZFKYQLO-UHFFFAOYSA-N 4-aminobutan-1-ol Chemical compound NCCCCO BLFRQYKZFKYQLO-UHFFFAOYSA-N 0.000 claims description 3
- RGFWQLHALIZEQV-UHFFFAOYSA-N 5-amino-3-methylpentan-1-ol Chemical compound NCCC(C)CCO RGFWQLHALIZEQV-UHFFFAOYSA-N 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000001856 Ethyl cellulose Substances 0.000 claims description 3
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 3
- PVCJKHHOXFKFRP-UHFFFAOYSA-N N-acetylethanolamine Chemical compound CC(=O)NCCO PVCJKHHOXFKFRP-UHFFFAOYSA-N 0.000 claims description 3
- AKNUHUCEWALCOI-UHFFFAOYSA-N N-ethyldiethanolamine Chemical compound OCCN(CC)CCO AKNUHUCEWALCOI-UHFFFAOYSA-N 0.000 claims description 3
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 claims description 3
- 239000000020 Nitrocellulose Substances 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920002396 Polyurea Polymers 0.000 claims description 3
- WUGQZFFCHPXWKQ-UHFFFAOYSA-N Propanolamine Chemical compound NCCCO WUGQZFFCHPXWKQ-UHFFFAOYSA-N 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 claims description 3
- 239000006230 acetylene black Substances 0.000 claims description 3
- 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 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 229920006217 cellulose acetate butyrate Polymers 0.000 claims description 3
- 229920001940 conductive polymer Polymers 0.000 claims description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 3
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 claims description 3
- 229920001249 ethyl cellulose Polymers 0.000 claims description 3
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 3
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229940102253 isopropanolamine Drugs 0.000 claims description 3
- 239000003273 ketjen black Substances 0.000 claims description 3
- CASZBAVUIZZLOB-UHFFFAOYSA-N lithium iron(2+) oxygen(2-) Chemical compound [O-2].[Fe+2].[Li+] CASZBAVUIZZLOB-UHFFFAOYSA-N 0.000 claims description 3
- 229910002102 lithium manganese oxide Inorganic materials 0.000 claims description 3
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 claims description 3
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 claims description 3
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical compound [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 229920001220 nitrocellulos Polymers 0.000 claims description 3
- 229920003055 poly(ester-imide) Polymers 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 10
- 230000014759 maintenance of location Effects 0.000 abstract description 10
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000011247 coating layer Substances 0.000 abstract 1
- 125000005462 imide group Chemical group 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 32
- 238000002360 preparation method Methods 0.000 description 18
- 238000005336 cracking Methods 0.000 description 15
- 230000001070 adhesive effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 238000001035 drying Methods 0.000 description 7
- 238000004458 analytical method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 239000006245 Carbon black Super-P Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910004761 HSV 900 Inorganic materials 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000013022 formulation composition Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 1
- 229920004813 ULTEM® CRS5001 Polymers 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- RSNHXDVSISOZOB-UHFFFAOYSA-N lithium nickel Chemical compound [Li].[Ni] RSNHXDVSISOZOB-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01M4/62—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 discloses a positive electrode slurry composition, positive electrode slurry, a positive electrode plate and a secondary battery thereof. The positive electrode slurry comprises an active material, a conductive substance, a binder auxiliary agent, a wetting agent, a dispersing agent and N-methylpyrrolidone, wherein the binder auxiliary agent is an imide structure-containing polymer, the wetting agent is an amino alcohol compound, and the dispersing agent is a cellulose derivative. The positive electrode slurry composition contains various components in a reasonable content range, and the dispersibility of the active material and the conductive substance can be improved by utilizing the synergistic effect of the binder auxiliary agent, the wetting agent and the dispersing agent, so that the flexibility of the pole piece can be effectively improved, the problem that the thick-coated pole piece cracks when thick coating is carried out can be solved, the energy density of a battery can be greatly improved by utilizing the thick coating layer, and the cycle performance such as capacity retention rate after the secondary battery is improved.
Description
Technical Field
The invention relates to the field of secondary battery materials, in particular to a positive electrode slurry composition, positive electrode slurry, a positive electrode plate and a secondary battery thereof.
Background
The lithium ion secondary battery is widely applied to various electronic devices, electric vehicles and other products as a clean energy source. With the continuous development of the consumer market, higher demands are placed on the energy density of lithium ion batteries. By reducing the dosage proportion of inactive materials (such as a diaphragm, a current collector and the like), the thick electrode pole piece is prepared, the duty ratio of the active materials can be greatly increased, and the energy density of the lithium ion battery can be effectively improved.
However, in the process of drying the thick-coated pole piece after coating, the volatilization path of the solvent becomes long, so that the binder in the slurry is easy to float upwards, the active material is easy to subside and aggregate, and in addition, the acting force of the solvent and the binder and other substances is strong, so that the problem of uneven volatilization of the solvent exists on the surface solvent close to the current collector and the surface far away from the current collector, and the stress exists in the positive electrode slurry, and finally the pole piece is cracked. Therefore, the dispersibility and stability of the slurry in the pole piece drying process are important to the preparation of the thick-coated pole piece, and the formulation composition of the slurry is an important factor affecting the stability of the slurry. Most of the current technologies develop and prepare thick electrodes only by improving coating processes, and little technical research is conducted on obtaining thick electrodes by adjusting the formulation composition of the slurry.
For example, in chinese patent application 202010429525.2, the distribution of the conductive agent, the binder, the void fraction, etc. in the vertical direction from the outer surface of the electrode sheet to the surface of the current collector is controlled by a fractional coating method, so as to obtain a thick electrode sheet with high load, and simultaneously, the liquid absorption time can be shortened, and the electrolyte wetting effect and the battery cycle performance can be improved. However, the process is relatively complex, the production efficiency is low, the coating, rolling and drying are required to be carried out for many times, and the energy consumption is high.
For another example, the Chinese patent application 201210191956.5 adopts an ultrasonic spraying method and a dry rolling method, so that the porosity of the membrane is gradually increased in the direction from the surface close to the current collector to the surface far away from the current collector, and the battery assembled by the thick-coated pole piece prepared by the method has higher energy density, good electrochemical performance, obviously improved lithium precipitation condition and obviously improved cycle stability. However, the method has very strict requirements on the collocation and proportion of the binder and the dispersion solvent, and has very high requirements on equipment and operation of spray drying, the energy consumption is necessarily large, the related equipment required by the existing coating is required to be upgraded, and the manufacturing and reconstruction costs are very high.
Disclosure of Invention
Aiming at the problems that a thick-coated pole piece cracks in a drying process and the cycle performance of a secondary battery is seriously attenuated in the prior art, the invention aims to provide a positive electrode slurry composition, a positive electrode slurry, a positive electrode pole piece and a secondary battery thereof.
The aim of the invention can be achieved by the following technical scheme:
[1] a positive electrode slurry composition comprising a main agent (A) and a synergist (B),
the main agent (A) contains an active material, a conductive substance, and a binder;
the synergistic agent (B) comprises a binder auxiliary agent, a wetting agent and a dispersing agent;
the adhesive auxiliary agent is an imide structure-containing polymer, the wetting agent is an amino alcohol compound, and the dispersing agent is a cellulose derivative.
[2] The positive electrode slurry composition according to [1], characterized in that,
the main agent (A) comprises 90-98 parts of the active material, 1-9 parts of the conductive substance and 1-9 parts of the binder based on 100 parts of the total mass of the main agent (A);
the content of the synergistic agent (B) is 3-15% of the content of the binder by mass;
the synergistic agent (B) comprises, by mass, 1.0% -3.0% of the binder auxiliary agent, 80% -94% of the wetting agent and 5% -18% of the dispersing agent.
[3] The positive electrode slurry composition according to [1] or [2], wherein the imide structure-containing polymer comprises one or more of polyimide, polyetherimide, polyamideimide, polyesterimide, polycarbonate imide, polyurethane imide, and polyurea imide.
[4] The positive electrode slurry composition according to [1] or [2], wherein the amino alcohol compound comprises one or more of ethanolamine, diethanolamine, N-methyldiethanolamine, N-methylethanolamine, N-ethyldiethanolamine, triethanolamine, propanolamine, isopropanolamine, butanolamine, isobutolamine, 3-methyl-5-amino-1-pentanol, diglycolamine, N-dimethylethanolamine, N-diethylethanolamine, N-phenylethanolamine, N-acetylethanolamine.
[5] The positive electrode slurry composition according to [1] or [2], wherein the cellulose derivative comprises one or more of methylcellulose, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, cellulose acetate, cyanoethylcellulose, hydroxypropylcellulose, hydroxypropylmethyl cellulose, cellulose nitrate, cellulose acetate butyrate and cellulose sulfonate.
[6] The positive electrode slurry composition according to [1] or [2], characterized in that,
the active material comprises one or more than two of lithium iron phosphorus oxide, lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron oxide, lithium nickel manganese oxide, lithium nickel cobalt aluminum oxide and a compound thereof, and is preferably lithium iron phosphorus oxide;
the conductive substance comprises one or more than two of conductive carbon black, conductive graphite, modified conductive graphite, metal particles, ketjen black, acetylene black, carbon nanotubes, carbon fibers, graphene and conductive polymers.
The binder comprises one or more than two of polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-propylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, vinylidene fluoride-trifluoroethylene copolymer and vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer.
[7] A positive electrode slurry comprising the positive electrode slurry composition according to any one of [1] to [6] and N-methylpyrrolidone,
the positive electrode slurry comprises a main agent slurry (I) and a synergistic agent slurry (II),
the main agent slurry (I) contains the main agent (A) and N-methyl pyrrolidone,
the main agent slurry (I) contains 60 to 150 parts by mass of N-methylpyrrolidone per 100 parts by mass of the main agent (A);
the synergist slurry (II) comprises the synergist (B) and N-methyl pyrrolidone,
the synergist slurry (II) contains 100-300 parts of N-methyl pyrrolidone relative to 100 parts of the synergist (B) by mass.
[8] The positive electrode sheet, characterized by comprising a positive electrode film layer formed of the positive electrode slurry described in [7 ].
[9] The positive electrode sheet according to [8], wherein the thickness of the positive electrode film layer is 150 to 380 μm.
[10] A secondary battery comprising the positive electrode sheet of [8] or [9 ].
The invention provides a positive electrode slurry composition, a positive electrode slurry, a positive electrode plate and a secondary battery thereof, wherein the positive electrode slurry composition contains an active material, a conductive substance, a binder and a synergistic agent in a reasonable content range, and the positive electrode slurry is prepared by precisely regulating the proportion of the binder auxiliary agent, a wetting agent and a dispersing agent in the synergistic agent, so that the positive electrode plate with good flexibility is obtained, the problem that the plate cracks when thick coating is performed can be solved, the energy density of the battery can be greatly improved by utilizing a thick coating film, and the cycle performance such as capacity retention rate after the secondary battery is improved. And the preparation process and the preparation steps are simple, and the method is suitable for large-scale industrialization and has practical application value.
Drawings
Fig. 1 shows the flexibility test of the positive electrode sheet in example 1.
Fig. 2 shows the flexibility test of the positive electrode sheet in comparative example 1.
Detailed Description
The invention is further described below with reference to examples.
The invention provides positive electrode slurry, which comprises an active material, a conductive substance, a binder, a synergist and N-methyl pyrrolidone;
the synergistic agent comprises a binder auxiliary agent, a wetting agent and a dispersing agent;
the binder auxiliary agent is an imide structure-containing polymer, and the imide structure-containing polymer comprises one or more than two of polyimide, polyetherimide, polyamide imide, polyester imide, polycarbonate imide, polyurethane imide and polyurea imide, preferably comprises polyetherimide and polyamide imide.
The structure of the imide structure-containing polymer is rich in polar carbonyl groups, and can form stronger interaction force with hydroxyl groups on a current collector and an active material, so that the bonding performance of the adhesive to the active material and the current collector is improved, the adhesive can interact with polar groups on the adhesive, the ordered discharge process of high polymers such as PVDF and the like into crystal lattices is disturbed, the crystallization is inhibited, the wetting capacity of the adhesive and the current collector is improved, the bonding performance of the adhesive and the current collector is improved, and the cracking problem of a thick-coated pole piece is relieved.
The wetting agent is an amino alcohol compound, which contains one or more of ethanolamine, diethanolamine, N-methyldiethanolamine, N-methylethanolamine, N-ethyldiethanolamine, triethanolamine, propanolamine, isopropanolamine, butanolamine, isobutanolamine, 3-methyl-5-amino-1-pentanol, diglycolamine, N-dimethylethanolamine, N-diethylethanolamine, N-phenylethanolamine, N-acetylethanolamine, preferably contains isobutolamine, N-dimethylethanolamine, N-diethylethanolamine, and has a molecular weight of 200 or less
The amino alcohol compound can be adsorbed on the surface of an active material through polar hydroxyl, and has an amino positive charge on the surface of the active material, so that the amino alcohol compound has an electrostatic stabilizing effect, reduces the surface energy of the whole slurry, is beneficial to the infiltration of a solvent and a binder to the active material, and improves the stability of the solvent volatilization of the whole slurry during drying. In addition, the amino alcohol compound with low molecular weight has low boiling point, can be volatilized completely rapidly when the pole piece is baked and dried, and is not remained in the pole piece, so that the performance of the battery is not affected.
The dispersing agent is a cellulose derivative, and the cellulose derivative comprises one or more of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, cellulose acetate, cyanoethyl cellulose, hydroxypropyl methyl cellulose, cellulose nitrate, cellulose acetate butyrate and cellulose sulfonate, preferably comprises cellulose acetate, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
The cellulose derivative can form a tight adsorption layer on the surface of the active material particles through adsorption to prevent flocculation and aggregation among the particles, so that the dispersion effect is achieved, a stable macromolecular network can be formed, and the flexibility of the pole piece is improved.
Further, the flexibility of the pole piece can be effectively improved by utilizing the synergistic effect of the adhesive auxiliary agent, the wetting agent and the dispersing agent which all contain polar groups, and the problem of cracking of the pole piece in thick coating is solved, so that the energy density of the battery is greatly improved; meanwhile, the adhesive property of the adhesive, the active material and the current collector can be improved, and the cycle performance of the secondary battery can be improved; in addition, the preparation process and the preparation steps are simple, and the method is suitable for large-scale industrialization and has practical application value.
The invention provides a positive electrode slurry composition, which is characterized by comprising a main agent (A) and a synergist (B),
the main agent (A) contains an active material, a conductive substance, and a binder;
the synergistic agent (B) comprises a binder auxiliary agent, a wetting agent and a dispersing agent;
the adhesive auxiliary agent is an imide structure-containing polymer, the wetting agent is an amino alcohol compound, and the dispersing agent is a cellulose derivative.
The main agent (A) comprises 90-98 parts of the active material, 1-9 parts of the conductive substance and 1-9 parts of the binder based on 100 parts of the total mass of the main agent (A);
the content of the synergistic agent (B) is 3-15% of the content of the binder by mass, preferably 10-15%;
the synergistic agent (B) comprises 1.0-3.0% of the binder auxiliary agent, 80-94% of the wetting agent and 5-18% of the dispersing agent according to the mass percentage of the synergistic agent (B);
in the positive electrode slurry composition, the active material contains one or more of lithium iron phosphorus oxide, lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron oxide, lithium nickel manganese oxide, lithium nickel cobalt aluminum oxide, and a composite thereof, preferably lithium iron phosphorus oxide, lithium cobalt oxide, lithium nickel cobalt manganese oxide, and more preferably lithium iron phosphorus oxide.
In the positive electrode slurry composition, the binder contains one or more of polyvinylidene fluoride, polytetrafluoroethylene, a vinylidene fluoride-tetrafluoroethylene copolymer, a vinylidene fluoride-hexafluoropropylene copolymer, a vinylidene fluoride-propylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-ethylene copolymer, a vinylidene fluoride-chlorotrifluoroethylene copolymer, a vinylidene fluoride-trifluoroethylene copolymer, and a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, and preferably polyvinylidene fluoride, and a vinylidene fluoride-hexafluoropropylene copolymer.
The conductive material is not particularly limited, and may include one or more of conductive carbon black Super P, conductive graphite, modified conductive graphite, metal particles, ketjen black, acetylene black, carbon nanotubes, carbon fibers, graphene, and conductive polymer, preferably Super P.
The present invention also provides a positive electrode slurry comprising the positive electrode slurry composition and N-methylpyrrolidone, wherein the positive electrode slurry comprises a main agent slurry (I) and a synergist slurry (II), the main agent slurry (I) comprises the main agent (a) and N-methylpyrrolidone, and the main agent slurry (I) comprises, in terms of parts by mass, 60 to 150 parts of N-methylpyrrolidone, preferably 90 to 120 parts of N-methylpyrrolidone, per 100 parts of the main agent (a); the synergist slurry (II) contains 100-300 parts by mass of N-methylpyrrolidone, preferably 200-300 parts by mass of N-methylpyrrolidone, relative to 100 parts by mass of the synergist (B).
The content of N-methylpyrrolidone is preferably in the above range, and is not particularly limited as long as the desired effect can be obtained.
The invention also provides a positive electrode plate which comprises a positive electrode film layer formed by the positive electrode slurry.
In the positive electrode sheet, the thickness of the positive electrode film layer is 150 to 380. Mu.m, preferably 190 to 320. Mu.m, more preferably 150 to 250. Mu.m.
The thickness of the positive electrode film layer can be controlled by adjusting the height of the scraper when the pole piece is coated.
A secondary battery comprising the positive electrode tab.
The present invention will be described in more detail below using examples and comparative examples, but the technical scope of the present invention is not limited to these examples.
The raw materials used in the invention are all purchased from market mainstream manufacturers and are all commodities with more than analytical grade, so long as the raw materials can play an expected role, and the raw materials are not particularly limited.
The equipment such as a homogenizer, a stirrer, a coater, a drying apparatus, an aluminum foil, a thickness gauge, etc. used in this example were purchased from major commercial manufacturers, and are not particularly limited as long as they can function as intended.
No particular technique or condition is identified in this example, which is performed according to techniques or conditions described in the literature in this field or according to product specifications.
Preparation example 1
The synergist slurry is prepared by the following preparation method, and the specific steps are as follows:
at 25 ℃, 1 part of polyetherimide (ULTEM CRS 5001), 9 parts of cellulose acetate (Isman, CA-398) and 200 parts of N-methylpyrrolidone are stirred at 100r/min for 3 hours, after being uniformly mixed, 90 parts of N, N-dimethylethanolamine is added and stirred at 100r/min for 1 hour to be uniformly mixed, and 300 parts of synergistic agent slurry is obtained.
Preparation examples 2 to 13
The basic steps of the preparation method of the synergist slurry are the same as in preparation example 1, except that the components and contents of the synergist slurry are as shown in table 1. Wherein the polyamideimide is from the Sorvellon AI-10.
Table 1 shows the formulation of each preparation example.
TABLE 1
Example 1
93 parts of lithium iron phosphate, 4 parts of conductive carbon black Super P, 3 parts of polyvinylidene fluoride (Acomat, HSV 900) and 120 parts of N-methylpyrrolidone were added to a homogenizer, mixed at 25 ℃ for 1min at 600r/min, to prepare a main agent slurry, and then 0.9 part of the synergist slurry prepared in preparation example 1, which contains 0.3 part of the synergist and 0.6 part of NMP solvent, was added, and mixed at 1000r/min for 10min, to obtain the positive electrode slurry of example 1 of the present invention.
Examples 2 to 12
The basic procedure of the preparation method of the positive electrode slurry was the same as in example 1, except that each component of the positive electrode slurry and the content thereof were as shown in table 2.
Comparative example 1
The positive electrode slurry of comparative example 1 was prepared by the following preparation method, which specifically comprises the following steps:
93 parts of lithium iron phosphate, 4 parts of conductive carbon black Super P, 3 parts of polyvinylidene fluoride (Acomat, HSV 900) and 120 parts of N-methylpyrrolidone are added into a homogenizer by mass, mixed for 1min at 600r/min at 25 ℃, and then mixed for 10min at 1000r/min, so as to obtain a positive electrode slurry.
Comparative example 2
The positive electrode slurry of comparative example 2 was prepared by the following preparation method, which specifically comprises the following steps:
93 parts of lithium iron phosphate, 4 parts of conductive carbon black Super P, 3 parts of polyvinylidene fluoride (Acomat, HSV 900), 0.9 part of the synergist prepared in preparation example 10 and 120 parts of N-methylpyrrolidone are added into a homogenizer by mass parts, mixed at 600r/min for 1min at 25 ℃, and then mixed at 1000r/min for 10min, to obtain a positive electrode slurry.
Comparative examples 3 to 7
The basic steps of the preparation method of the positive electrode slurry were the same as comparative example 2, except that the components and contents of the positive electrode slurry were as shown in table 2.
Table 2 shows the formulations of each example and comparative example, and the synergists were the synergists prepared in each preparation example.
TABLE 2
In the column of N-methylpyrrolidone in Table 2, for example, N-methylpyrrolidone in example 1 is 120+0.6 parts, which represents the sum of the parts by weight of N-methylpyrrolidone in the main agent slurry and N-methylpyrrolidone in the synergist slurry, and the same applies below.
< cathode sheet >
Positive electrode sheets comprising the positive electrode slurries of examples 1 to 12 and comparative examples 1 to 7 were prepared.
The positive electrode slurries prepared in examples 1 to 12 and comparative examples 1 to 7 were uniformly coated on the surface of a positive electrode current collector aluminum foil having a thickness of 16 μm at a coating speed of 30m/min and a thickness after drying to the thickness described in Table 3 by a blade coater, and baked at 105℃for 1 hour to remove the solvent, thereby obtaining a positive electrode sheet.
< button cell Assembly >
The button cell assembly was performed in a glove box. The assembly was performed in the order of "negative electrode cap-foam nickel-lithium sheet-separator (about 3 drops of electrolyte was added, the electrolyte composition was EC: EMC: DEC volume ratio=1:1:1 (1.0 ml ipf 6)) -positive electrode sheet-gasket-elastic sheet-positive electrode cap". Wherein the isolation film is a PE film with a thickness of 9 μm.
And placing the assembled button cell in a die cavity of a hydraulic sealing machine (Ke Jing Zhi Da technology), locking, shaking a handle, pressing by more than 500kg/cm < 2 >, unlocking, and taking out the sealed button cell.
The performance test of the invention is as follows:
(1) The flexibility of the pole piece is as follows:
the positive electrode sheets prepared in examples 1 to 12 and comparative examples 1 to 7 were cut into 250mm×100mm pieces at room temperature, and were laid on a horizontal stage with a portion of 100mm×100mm at one end exposed to the edge of the stage, and naturally dropped at 90 °, and the surface state of the sheet was observed, and the sheet was marked as good as o, slight crack was marked as ≡and severe crack was marked as ×.
(2) Internal resistance test of secondary battery and battery cycle performance test:
[1] internal resistance test of secondary battery:
the secondary batteries prepared in examples 1 to 12 and comparative examples 1 to 7 were tested for internal resistance using a Solartron electrochemical workstation.
[2] Cycle performance test of secondary battery:
the secondary battery prepared as above was charged to 4.2V at a constant current of 0.33C at 25 ℃, and then charged to an off current of 0.02C at a constant voltage, left for 5min, discharged to 2.5V at 0.33C, left for 5min, and the discharge capacity after the first cycle was recorded. Again, charge to 4.2V with a constant current of 0.33C, charge to off current of 0.02C at constant voltage, rest for 5min, discharge to 2.5V with 0.33C, rest for 5min, and after 100 cycles of charge/discharge in this cycle, record the discharge capacity after the 100 th cycle.
The capacity retention rate of the lithium ion secondary battery after 100 cycles was calculated using the following formula:
capacity retention after 100 cycles (%) =discharge capacity after 100 th cycle/discharge capacity after first cycle. The test results are shown in Table 3.
TABLE 3 Table 3
From table 3, it is known from analysis of examples 1 to 12 and comparative example 1 that in the case of thick-coated pole pieces, the pole pieces of examples 1 to 12 are significantly superior to comparative example 1 in terms of cracking condition, internal resistance and capacity retention rate, because the positive electrode slurry of comparative example 1 does not contain the synergist slurry of the present invention, and the flexibility is insufficient, resulting in easy cracking of thick-coated pole piece film layer, further resulting in increased internal resistance and greatly reduced cycle performance.
As shown in fig. 1, the positive electrode sheet in example 1 was excellent in flexibility, and was laid flat on a horizontal platform so that one end was exposed to the edge of the platform, and when naturally hung at 90 °, no cracking occurred. As shown in fig. 2, in the same case, the positive electrode sheet of comparative example 1 was cracked, indicating that the film layer was not flexible enough.
Analysis of examples 1 to 12 and comparative example 2 revealed that in the case of thick-coated pole pieces, the pole pieces of examples 1 to 12 had better cracking and internal resistance than comparative example 2, because the synergist in the positive electrode slurry of comparative example 2 did not contain the binder aid, and it was difficult to suppress crystallization of PVDF, the wettability of the binder and the current collector was poor, and the pole piece film had slight cracking.
Analysis of examples 1 to 12 and comparative example 3 revealed that in the case of thick-coated pole pieces, the pole pieces of examples 1 to 12 had significantly better cracking, internal resistance and capacity retention than comparative example 3, because the wetting agent in the synergist in the positive electrode slurry of comparative example 3 was too small, and was lower than the lower limit value of the target range, resulting in poor wetting ability of the binder with the current collector, poor volatilization stability, and cracking of the pole piece film.
Analysis of examples 1 to 12 and comparative example 4 revealed that in the case of thick coated pole pieces, the pole pieces of examples 1 to 12 were significantly superior to comparative example 4 in cracking, internal resistance and capacity retention, because the absence of the dispersant in the synergist in the positive electrode slurry of comparative example 4 resulted in poor dispersibility of the slurry, flocculation and coalescence among the active material particles, and easy cracking.
Analysis of examples 1 to 12 and comparative example 5 revealed that in the case of thick coated pole pieces, the pole pieces of examples 1 to 12 were significantly superior to comparative example 5 in cracking, internal resistance and capacity retention, because the positive electrode slurry of comparative example 5 had too much wetting agent and too little dispersant in the synergist, resulting in poor dispersibility of the slurry, flocculation and coalescence among the active material particles, and easy cracking.
Analysis of examples 1 to 12 and comparative example 6 revealed that in the case of thick-coated pole pieces, the pole pieces of examples 1 to 12 were significantly superior to comparative example 6 in terms of cracking, internal resistance and capacity retention, because the active material in the synergist in the positive electrode slurry of comparative example 6 was low, the conductive material was high, and out of the preferred range of the present invention, the contact area of the binder and the current collector was reduced due to the large specific surface area of the conductive material, the pole pieces were easily cracked, and the capacity retention after cycling was reduced.
In summary, the positive electrode slurry composition contains the active material, the conductive substance, the binder and the synergist in a reasonable content range, and the proportion of the binder auxiliary agent, the wetting agent and the dispersant is precisely regulated in the synergist, so that the dispersibility of the active material and the conductive substance can be improved by utilizing the synergistic effect of the binder auxiliary agent, the wetting agent and the dispersant which all contain polar groups, the wettability of the binder and the current collector can be improved, the flexibility of the pole piece can be effectively improved, the high-performance positive electrode pole piece can be prepared, the problem of cracking of the pole piece with a thick coating film layer can be solved, the energy density of a battery can be greatly improved by utilizing the thick coating film layer, the internal resistance of the battery can be reduced, and the cycle performance of the secondary battery can be improved.
The foregoing is merely a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and the present invention is described by using the specific examples, which are only for aiding in understanding the present invention, and are not limited thereto. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art according to the idea of the invention. Such deductions, modifications or alternatives fall within the scope of the claims of the present invention.
Claims (10)
1. A positive electrode slurry composition is characterized by comprising a main agent A and a synergist B,
the main agent A comprises an active material, a conductive substance and a binder;
the synergistic agent B comprises a binder auxiliary agent, a wetting agent and a dispersing agent;
wherein the binder auxiliary agent is an imide structure-containing polymer, the wetting agent is an amino alcohol compound, and the dispersing agent is a cellulose derivative;
based on 100 parts by weight of the total mass of the main agent A, the main agent A comprises 90-98 parts by weight of the active material, 1-9 parts by weight of the conductive substance and 1-9 parts by weight of the binder;
the content of the synergist B is 3-15% of the content of the binder by mass;
the synergistic agent B comprises 1.0-3.0% of the binder auxiliary agent, 80-94% of the wetting agent and 5-18% of the dispersing agent according to the mass percentage of the synergistic agent B.
2. The positive electrode slurry composition according to claim 1, wherein the imide structure-containing polymer contains one or more of polyimide, polyetherimide, polyamideimide, polyesterimide, polycarbonate imide, polyurethane imide, and polyurea imide.
3. The positive electrode slurry composition according to claim 1 or 2, wherein the amino alcohol compound comprises one or more of ethanolamine, diethanolamine, N-methyldiethanolamine, N-methylethanolamine, N-ethyldiethanolamine, triethanolamine, propanolamine, isopropanolamine, butanolamine, isobutolamine, 3-methyl-5-amino-1-pentanol, diglycolamine, N-dimethylethanolamine, N-diethylethanolamine, N-phenylethanolamine, N-acetylethanolamine.
4. The positive electrode slurry composition according to claim 1 or 2, wherein the cellulose derivative comprises one or two or more of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, cellulose acetate, cyanoethyl cellulose, hydroxypropyl methyl cellulose, cellulose nitrate, cellulose acetate butyrate, and cellulose sulfonate.
5. The positive electrode slurry composition according to claim 1 or 2, wherein,
the active material comprises one or more than two of lithium iron phosphorus oxide, lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium iron oxide, lithium nickel manganese oxide, lithium nickel cobalt aluminum oxide and a compound thereof;
the conductive substance comprises one or more than two of conductive carbon black, conductive graphite, modified conductive graphite, metal particles, ketjen black, acetylene black, carbon nanotubes, carbon fibers, graphene and conductive polymers;
the binder comprises one or more than two of polyvinylidene fluoride, polytetrafluoroethylene, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-propylene copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, vinylidene fluoride-trifluoroethylene copolymer and vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer.
6. The positive electrode slurry composition according to claim 5, wherein,
the active material is lithium iron phosphorus oxide.
7. A positive electrode slurry comprising the positive electrode slurry composition according to any one of claims 1 to 6 and N-methylpyrrolidone,
the positive electrode slurry comprises a main agent slurry I and a synergistic agent slurry II,
the main agent slurry I comprises the main agent A and N-methyl pyrrolidone,
the main agent slurry I comprises, by mass, 60 to 150 parts of N-methylpyrrolidone relative to 100 parts of the main agent A;
the synergist slurry II comprises the synergist B and N-methyl pyrrolidone,
the synergist slurry II comprises 100-300 parts of N-methyl pyrrolidone relative to 100 parts of the synergist B by mass.
8. A positive electrode sheet comprising a positive electrode film layer formed from the positive electrode slurry described in claim 7.
9. The positive electrode sheet according to claim 8, wherein the positive electrode film layer has a thickness of 150 to 380 μm.
10. A secondary battery comprising the positive electrode sheet according to claim 8 or 9.
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| CN107565090A (en) * | 2017-08-30 | 2018-01-09 | 清陶（昆山）能源发展有限公司 | A kind of positive plate of lithium battery and preparation method thereof |
| CN109411700A (en) * | 2018-05-13 | 2019-03-01 | 清陶（昆山）能源发展有限公司 | A kind of anode pole piece and preparation method thereof applied to all-solid lithium-ion battery |
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| CN107565090A (en) * | 2017-08-30 | 2018-01-09 | 清陶（昆山）能源发展有限公司 | A kind of positive plate of lithium battery and preparation method thereof |
| CN109411700A (en) * | 2018-05-13 | 2019-03-01 | 清陶（昆山）能源发展有限公司 | A kind of anode pole piece and preparation method thereof applied to all-solid lithium-ion battery |
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