CN115036453A - Positive pole piece and lithium ion battery - Google Patents
Positive pole piece and lithium ion battery Download PDFInfo
- Publication number
- CN115036453A CN115036453A CN202210702359.8A CN202210702359A CN115036453A CN 115036453 A CN115036453 A CN 115036453A CN 202210702359 A CN202210702359 A CN 202210702359A CN 115036453 A CN115036453 A CN 115036453A
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- CN
- China
- Prior art keywords
- safety coating
- coating
- safety
- current collector
- connecting layer
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 113
- 238000000576 coating method Methods 0.000 claims abstract description 113
- 239000011149 active material Substances 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 239000011230 binding agent Substances 0.000 claims description 25
- 239000006258 conductive agent Substances 0.000 claims description 24
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
- 239000002033 PVDF binder Substances 0.000 claims description 10
- 229910052744 lithium Inorganic materials 0.000 claims description 10
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 10
- 239000011853 conductive carbon based material Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000006230 acetylene black Substances 0.000 claims description 4
- 239000002134 carbon nanofiber Substances 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 239000006232 furnace black Substances 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 9
- 239000007774 positive electrode material Substances 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 78
- 239000002002 slurry Substances 0.000 description 18
- 239000004020 conductor Substances 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 16
- 239000011888 foil Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- 239000011247 coating layer Substances 0.000 description 11
- 239000011256 inorganic filler Substances 0.000 description 8
- 229910003475 inorganic filler Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000006255 coating slurry Substances 0.000 description 6
- -1 alkali metal bicarbonate Chemical class 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 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 4
- 238000002156 mixing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- YWJVFBOUPMWANA-UHFFFAOYSA-H [Li+].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O Chemical compound [Li+].[V+5].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O YWJVFBOUPMWANA-UHFFFAOYSA-H 0.000 description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000000945 filler Substances 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
- SBWRUMICILYTAT-UHFFFAOYSA-K lithium;cobalt(2+);phosphate Chemical compound [Li+].[Co+2].[O-]P([O-])([O-])=O SBWRUMICILYTAT-UHFFFAOYSA-K 0.000 description 3
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 102100028667 C-type lectin domain family 4 member A Human genes 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 101000766908 Homo sapiens C-type lectin domain family 4 member A Proteins 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 0.000 description 2
- 238000001467 acupuncture Methods 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229910001593 boehmite Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical group O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229910052580 B4C Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000011262 electrochemically active material Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- DMEJJWCBIYKVSB-UHFFFAOYSA-N lithium vanadium Chemical compound [Li].[V] DMEJJWCBIYKVSB-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical group [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
-
- 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
- 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/626—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- 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 relates to a positive pole piece, which comprises a current collector, a safety coating and a positive active material layer, and is characterized in that: a connecting layer is arranged between the safety coating and the current collector, one side face or two side faces of the current collector are arranged in the connecting layer, the safety coating is arranged on the outer side of the connecting layer, and an active material layer is arranged on the outer side of the safety coating. The lithium ion battery is made of a positive plate with a connecting layer between a safety coating and a current collector. Has the beneficial effects that: according to the invention, the connecting layer is added between the safety coating and the current collector, the safety coating is in surface contact with the current collector, the surface resistance between the current collector and the safety coating is improved, and the thickness of the safety coating can be reduced by 30-50% on the premise of ensuring the safety effect of the battery. The energy density of the battery is remarkably increased, and meanwhile, the composite body of the connecting layer and the safety coating can effectively prevent the positive current collector from contacting with the negative active layer, so that the short-circuit internal resistance in the needling process is increased, and the needling test passing rate of the lithium ion battery is improved.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a positive pole piece and a lithium ion battery.
Background
The lithium ion battery has the advantages of high working voltage, high specific energy, long cycle life, no environmental pollution and the like, and is not only widely applied to mobile communication equipment and portable electronic equipment, but also widely applied to large and medium-sized electric equipment such as electric automobiles, electric bicycles, electric tools and the like. The safety problem of lithium ion batteries is getting more and more attention. Swelling easily occurs in the battery circulation process, the pole piece cannot be uniformly soaked by the internal electrolyte, the polarization of the battery is increased, lithium is easily separated from a negative electrode interface, potential safety hazards are buried, and meanwhile, the performance of the battery is continuously deteriorated, for example, the power performance of the battery is continuously reduced, and the cycle life is rapidly reduced. Lithium ion batteries are prone to fire and explosion when subjected to abnormal conditions such as extrusion, collision or puncture, thereby causing serious damage. The main reasons for analyzing the battery fire are: puncture failure of the lithium ion battery is caused by contact of the aluminum foil of the positive current collector and the active material of the negative electrode. Patent document with application publication number CN 114464779 a discloses a lithium ion battery positive electrode plate with a safety coating and a preparation method thereof, the method comprises the following steps: preparing safety coating slurry: adding a matrix material aerogel material, a high-stability anode material, a conductive agent and a binder into a dispersing agent, and dispersing to obtain a safe coating slurry; preparing positive active material slurry: mixing and stirring raw materials of the positive active material to obtain positive active material slurry; multilayer extrusion coating: coating the safety coating slurry and the positive active material slurry on a positive current collector; cold pressing: and (4) carrying out cold pressing on the coated positive current collector to obtain the lithium ion battery positive pole piece with the safety coating. Patent document No. CN 103059613a discloses. The lithium ion battery safety coating is prepared from one or a mixture of alkali metal hydroxide, alkali metal carbonate and alkali metal bicarbonate, and has a chemical general formula of MX (OH) y, MX (CO3) y, MX (HCO3) y, and M is alkali metal.
In order to solve these problems, researchers have made a lot of studies, but the improvement effect is limited, and it is impossible to fundamentally improve the safety and cycle life of the battery or to reduce the increase in internal resistance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the positive pole piece and the lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a positive pole piece, includes the mass flow body, safety coating and anodal active material layer, characterized by: the safety coating is characterized in that a connecting layer is arranged between the safety coating and the current collector, one side face or two side faces of the current collector are arranged in the connecting layer, the safety coating is arranged on the outer side of the connecting layer, and an active material layer is arranged on the outer side of the safety coating.
The connecting layer comprises a conductive agent and a binder, and the components of the connecting layer in parts by mass are as follows:
20-80 parts of conductive agent and 20-80 parts of binder.
The binder is one or a mixture of more of Styrene Butadiene Rubber (SBR), Nitrile Butadiene Rubber (NBR), polyvinylidene fluoride (PVDF), sodium polyacrylate (PAA-Na) or lithium polyacrylate (PAA-lithium).
The conductive agent is at least one of a conductive carbon-based material and a conductive metal material, wherein the conductive carbon-based material is at least one of furnace black, conductive carbon black, acetylene black, graphite, graphene, carbon nanotubes or carbon nanofibers.
The thickness of the connecting layer is 1-5 μm.
A lithium ion battery is made of a positive plate with a safety coating and a connecting layer between a current collector.
Has the advantages that: compared with the prior art, the invention improves the point contact between the safety coating and the current collector into surface contact by adding the connecting layer between the safety coating and the current collector, thereby improving the surface resistance between the current collector and the safety coating, reducing the thickness of the safety coating by 30-50% on the premise of ensuring the safety effect of the battery, obviously increasing the energy density of the battery, simultaneously effectively preventing the positive current collector from contacting with the negative active layer by a complex of the connecting layer and the safety coating, increasing the short circuit internal resistance in the needling process, expanding the volume of a binder as a high polymer material during short circuit, increasing the distance between conductive material particles, breaking a conductive network, leading the current to be close to zero, preventing the temperature from rising, improving the needling test throughput of the lithium ion battery and improving the safety performance of the battery.
Drawings
FIG. 1 is a schematic view showing the structure of a positive electrode plate of a battery according to an embodiment,
FIG. 2 is a schematic diagram of a connecting layer coated on a current collector to form a connecting layer semi-finished pole piece structure;
fig. 3 is a schematic structural diagram of a connecting layer + safety coating semi-finished pole piece.
In the figure: 101. a positive current collector; 102. a connection layer; 103. a security coating; 104. a positive electrode active material layer.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In various embodiments of the present invention, for convenience in description and not in limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
The invention provides a positive pole piece, which comprises a current collector, a safety coating and a positive active material layer, wherein a connecting layer is arranged between the safety coating and the current collector, the connecting layer is arranged on one side surface or two side surfaces of the current collector, the safety coating is arranged on the outer side of the connecting layer, and the active material layer is arranged on the outer side of the safety coating. The connecting layer comprises a conductive agent and a binder, and the components of the connecting layer in parts by mass are as follows: 20-80 parts of conductive agent and 20-80 parts of binder.
The binder is one or a mixture of Styrene Butadiene Rubber (SBR), Nitrile Butadiene Rubber (NBR), polyvinylidene fluoride (PVDF), sodium polyacrylate (PAA-Na) or lithium polyacrylate (PAA-lithium).
The conductive agent is at least one of a conductive carbon-based material and a conductive metal material, wherein the conductive carbon-based material is at least one of furnace black, conductive carbon black, acetylene black, graphite, graphene, carbon nanotubes or carbon nanofibers.
The thickness of the connecting layer is 1-5 μm.
A lithium ion battery is made of a positive plate with a safety coating and a connecting layer between a current collector.
Principle of design
The contact between the aluminum foil of the positive current collector and the negative active material is a main cause of puncture failure of the lithium ion battery.
In order to achieve the purpose of improving the battery ignition, the invention arranges a safe coating on the surface of the naked positive current collector to prevent the current collector from contacting with a negative electrode, increase the short circuit internal resistance in the needling process, prevent the temperature from rising and improve the safety effect, and the safe coating filler is selected from inorganic materials with good thermal stability, wherein the inorganic materials are selected from at least one of metal oxides, non-metal oxides, metal carbides, non-metal carbides and inorganic salts, or at least one of the conductive carbon coating modification, the conductive metal coating modification or the conductive polymer coating modification of the materials; preferably, the inorganic filler in the security coating layer is magnesium oxide, aluminum hydroxide, titanium dioxide, zirconium oxide, silicon dioxide, silicon carbide, boron carbide, calcium carbonate, aluminum silicate, calcium silicate, potassium titanate, barium sulfate, lithium nickel manganese cobaltate, lithium nickel manganese aluminate, lithium iron phosphate, lithium vanadium phosphate, lithium cobalt phosphate, lithium manganese phosphate, lithium iron silicate, lithium vanadium silicate, lithium cobalt silicate, lithium manganese silicate, spinel-type lithium manganate, lithium titanate, or a conductive carbon-coated modified material thereof; the average particle diameter D of the inorganic filler is smaller than the thickness of the safety coating, and D is more than or equal to 100nm and less than or equal to 5 mu m.
The safety coating filler is a semiconductor or an insulating material, and due to poor conductivity, in order to effectively connect the active material and the current collector, a conductive material needs to be added between the safety fillers. The conductive material is at least one of a conductive carbon-based material and a conductive metal material, wherein the conductive carbon-based material is at least one of furnace black, conductive carbon black, acetylene black, graphite, graphene, carbon nanotubes and carbon nanofibers; the conductive metal material is at least one of Al powder and Ni powder.
The conductive material is added into the safety coating, which is beneficial to improving the electronic path between the active material and the current collector and improving the electrical property of the lithium ion battery, but the content of the conductive agent is not too high, otherwise, the internal resistance of the safety coating is influenced, the puncture passing rate of the lithium ion battery is reduced, the number of electronic channels of the safety coating is determined by the use multiplying power performance of the battery, when short circuit occurs, the number of paths of the safety coating is limited to limit short circuit current, excessive heat accumulation in a short time is avoided, and ignition and explosion occur, so the content of the safety coating needs to be controlled so as to control the current threshold of the safety coating.
Therefore, the total weight of each part of the macromolecular binder, the conductive material and the inorganic filler of the safety coating is 100, based on the total weight of the safety coating, the macromolecular binder is 3-40 parts, the conductive material is 5-25 parts and the inorganic filler is 92-35 parts according to the weight part ratio. The thickness of the safety coating is 3-20 μm for obtaining a higher energy battery.
In the research, the proportion of the conductive material for determining the safety coating is mainly determined by two directions, wherein one direction is to improve the volume resistance of the safety coating, the volume resistance is required to be 2-20 omega cm, and the other direction is to improve the surface resistance between the safety coating and the current collector. In the research, the surface resistance between the safety coating and the aluminum foil reaches 2 omega cm under the premise that the volume resistance meets the safety performance requirement 2 The battery manufactured by using the safety coating has higher internal resistance, the discharge platform and the capacity of the battery are influenced, and the cycle performance of the battery is obviously deteriorated. The main reason of large surface resistance is that the contact area of the safety coating and the current collector is point contact, and the effective electronic path is less, so in order to improve the surface resistance of the safety coating to a proper range and reduce the influence of the surface resistance of the safety coating on the electrical property of the battery, a conductive material is required to be added to reduce the surface resistance between the safety coating and the aluminum foil to 0.03-0.5 omega-cm 2 When increasing conducting material and improving surface resistance, will reduce safety coating's bulk resistance simultaneously, battery security performance can reduce simultaneously, and the probability through the acupuncture experiment will reduce, does not reach the effect that the acupuncture safety passed through, therefore we need to promote safety coating thickness. The increase in the thickness of the safety coating layer will decrease the energy density of the battery, and thus the problem of the surface resistance of the safety coating layer affects the energy density of the safety battery.
According to the invention, the connecting layer is added between the safety coating and the current collector, so that the point contact of the safety coating and the current collector is improved to be surface contact, and the surface resistance problem of the current collector and the safety coating is improved. Therefore, no conductive agent needs to be added to improve the sheet resistance problem, i.e., no increase in the thickness of the safety coating is required. Compared with the prior safe battery without the connecting layer, the thickness of the safe coating can be reduced by 30-50% under the premise of the same safe effect. The surface resistance between the connecting layer + safety coating composite and the aluminum foil can reach 0.03-0.5 omega cm 2 。
In the present invention, the higher the weight ratio of the conductive material of the connection layer, the better, since the specific surface area of the conductive material is as large as possibleTo 50m 2 In order to achieve a better bonding effect, more bonding agents are correspondingly required to be added so as to improve the bonding effect between the aluminum foil and the aluminum foil. The mass part ratio of the binder generally satisfies 20 to 80 parts based on the total weight of the joining layer. Preferably 40 to 75 parts.
In order to obtain a higher energy density, the thickness of the connection layer is as thin as possible, the thickness of the connection layer being 1-5 μm.
The positive current collector is a common aluminum foil (smooth foil, and the surface is not coated with other materials). The thickness of the positive electrode current collector is 6-20 μm. The active material layer in the positive pole piece comprises a functional active material, a conductive material and a binder in parts by weight, wherein the total weight of all the materials is 100 parts, the active material is 90-99 parts, the conductive material is 0.5-4 parts, and the binder is 0.5-6 parts. The thickness of the active material layer is 20-100 μm. The functional active material of the positive plate comprises lithium cobaltate, lithium nickelate, lithium nickel manganese cobaltate, lithium nickel manganese aluminate, a lithium-rich manganese-based material, layered lithium manganate, lithium iron phosphate, lithium vanadium phosphate, lithium cobalt phosphate, lithium manganese phosphate, spinel lithium manganate or conductive carbon-coated modified materials thereof.
The preparation method of the positive plate comprises the following specific steps:
1) respectively preparing connecting slurry for forming a connecting layer, safety slurry for forming a safety coating and active material slurry for forming an active material layer;
2) and sequentially coating the connecting slurry for forming the connecting layer, the safety slurry for forming the safety coating and the active material slurry for forming the active material layer on the surface of the current collector aluminum foil by using a coating machine to prepare the positive plate.
On the surface of the positive electrode current collector, coating the connection slurry for forming the connection layer from one end of the aluminum foil current collector, finishing coating to the other end to form the connection layer, then coating the safety slurry for forming the safety coating on the basis of the connection layer from one end of the current collector, finishing coating to the other end to form the safety coating, then coating the active material slurry for forming the active material coating on the basis of the safety coating from one end of the current collector, and finishing coating to the other end to form the active material coating. And sequentially coating the connecting slurry for forming the connecting layer, the safety slurry for forming the safety coating and the active material slurry for forming the second active material layer on the first surface and the second surface of the positive current collector to prepare the positive plate.
Example 1
The connecting layer comprises 60 parts by mass of carbon black and 40 parts by mass of an acrylate, and the thickness of one side of the connecting layer is 2 μm.
The safety coating comprises 65 parts by mass of lithium manganese iron phosphate, 30 parts by mass of polyvinylidene fluoride and 5 parts by mass of carbon
Black, 8 μm thick;
the positive electrode active material layer included 97 parts by mass of lithium cobaltate, 1.3 parts by mass of polyvinylidene fluoride, and 1.7 parts by mass of carbon black, and had a thickness of 95 μm;
the preparation method of the positive plate provided by the embodiment comprises the following steps:
1. dissolving 60 parts by mass of carbon black and 40 parts by mass of acrylic ester in deionized water, and uniformly mixing to obtain a connecting coating slurry;
coating the connecting layer slurry on the upper surface and the lower surface of the aluminum foil by using a gravure coater, and drying at 110 ℃ to obtain a connecting layer semi-finished pole piece 1, as shown in figure 1;
2. dissolving 65 parts by mass of lithium manganese iron phosphate, 30 parts by mass of polyvinylidene fluoride and 5 parts by mass of carbon black in NMP, and uniformly mixing to obtain safe coating slurry (the solid content is 15%);
coating the safe coating slurry on the upper surface and the lower surface of the connecting layer semi-finished pole piece 1 by using a gravure coater, and drying at 110 ℃ to obtain a connecting layer + safe coating semi-finished pole piece 2, as shown in figure 2;
3. dissolving 97 parts by mass of lithium cobaltate, 1.3 parts by mass of polyvinylidene fluoride and 1.7 parts by mass of carbon black in NMP, and uniformly mixing to form positive active layer slurry (the solid content is 75%);
coating the slurry of the positive active layer on the surface of the semi-finished pole piece 2 by using slit type extrusion coating equipment, drying at 100 ℃, and rolling and cutting into positive plates as shown in figure 3.
In the above method for manufacturing the positive plate of embodiment 1, the materials and the proportions of the connection layer and the safety coating layer are adjusted in other embodiments and comparative examples, which are shown in fig. 2, to respectively manufacture corresponding semi-finished pole pieces, the semi-finished pole pieces of different schemes are subjected to pole piece surface resistance and body resistance tests, and then the corresponding positive plates are respectively manufactured.
By a conventional battery manufacturing process, a 10-micron polypropylene film is used as an isolating film, a positive pole piece, the isolating film and a negative pole piece are sequentially stacked, the isolating film is positioned between the positive pole piece and the negative pole piece to play an isolating role, then the positive pole piece, the isolating film and the negative pole piece are wound into a pole group, then a pole is placed in an aluminum plastic shell, double-side sealing is carried out, vacuum baking is carried out for 10 hours at 90 ℃, electrolyte is injected (EC: EMC: DEC volume ratio is 3:3:4, LiPF6 is 1mol/L), sealing, formation and other working procedures are carried out, finally a lithium ion battery is manufactured, and the corresponding positive pole piece is manufactured into the battery with the corresponding scheme
3. Performance testing of batteries
The safety of the secondary batteries of the respective examples and comparative examples was evaluated, and the test results were recorded.
3.1 needling test:
fully charging the secondary battery to 4.4V at 1C, then charging at constant voltage until the current is reduced to 0.05C, and stopping charging. The used high temperature resistant steel needle (the taper angle of the needle tip is 45 degrees), the diameter of the steel needle is 2.5mmm, the steel needle penetrates through the battery from the direction vertical to the battery pole piece at the speed of 150mm/s, the penetrating position is close to the geometric center of the punctured surface, the steel needle stays in the battery, and whether the battery has combustion and explosion phenomena or not is observed.
3.2 cycle performance test:
the cycle number test conditions were: at 25 ℃, the secondary battery is subjected to a 1C/1C cycle test, the charging and discharging voltage ranges from 3V to 4.4V, and after 600 cycles, the residual capacity proportion of each discharging battery is observed.
3.3DCR test
The secondary battery was adjusted to 50% SOC at 25 ℃ with a current of 0.1C, and voltage U1 was recorded. Then discharged at 1C for 0.5 seconds and voltage U2 recorded. DCR ═ (U1-U2)/0.9C.
3.4IR testing
The internal resistance of the battery was measured using a battery internal resistance tester of guangzhou Optimus industry Co., Ltd, model BS-VR3, frequency set at 1000 HZ.
3.5 sheet and bulk resistance testing
The sheet and bulk resistances of the pole pieces were tested using an XF057 electrode resistance tester with a HiOKI 46 probe.
4. Results of Performance testing
The following table lists a number of examples of positive plate solutions, including raw materials and process methods and corresponding cell performance.
Comparing example 1 with example 2, it can be seen that different kinds of conductive agents can all play a role in establishing an electronic path and improving the conductivity of the security coating, but the comparison between example 1 and example 3 shows that the content of the conductive agent can affect the number of the conductive paths, and as the content of the conductive agent is reduced, the corresponding content of the binder is increased, the conductive paths are reduced, and the improvement effect of the connecting layer is affected. The conductive agent has a large specific surface area, and therefore, a large amount of the binder is adsorbed, and the bonding effect of the connection layer is affected by the excessive content of the conductive agent, so that the weight ratio of the binder to the weight ratio of the conductive agent needs to be coordinated with each other. Compared with the comparative example 8, the surface resistance of the semi-finished pole piece 2 of the connecting layer + the safety coating is not improved under the condition that the content of the conductive agent of the connecting layer is lower, even the surface resistance is increased due to the fact that the content of the binder is too high, the DCIR of the battery is remarkably increased, the cycle performance of the battery is obviously degraded, the weight percentage of the conductive agent of all the connecting layers is 20-80 wt%, and the weight percentage of the binder is 20-80 wt%.
The internal resistance of the cells after the needle punching test was conducted on the cells of examples 1 to 3 and comparative example 8, and the test results were as follows.
Comparison of internal resistance changes before and after the test shows that: when the connection layer contains a high content of the binder, the internal temperature of the battery rises at the time of short circuit, and the internal resistance of the battery increases at the time of temperature rise; especially when the connection layer contains a relatively high content of the binder and at the same time contains the conductive material, the increase rate of the internal resistance of the battery is very significant. The inventors believe that at normal temperature, the connecting layer conducts electrons by virtue of a good conductive network formed between the conductive materials; when the temperature rises, the volume of the binder serving as a high polymer material begins to expand, the space between the conductive material particles is increased, the conductive network part is broken, and the resistance of the connecting layer is gradually increased; when a certain temperature is reached, the conductive network is almost completely cut off, the current approaches zero, and the safety performance of the battery can be improved obviously by utilizing the characteristic.
The thickness of the connecting layer is selected, and the initial purpose of introducing the connecting layer is to improve the conductivity of the safety coating, so the thickness of the connecting layer is desired to be as thin as possible on the premise of improving the conductivity, but the connecting layer cannot be in surface contact with the performance of the safety coating after being extremely thin, thereby reducing the improvement effect. Compared with the comparative example 6, the result shows that if the connecting layer is too thick, the conductivity of the safety coating is not further improved, the thickness of the battery is increased due to the safety coating, the energy density of the battery is obviously reduced, and the industrialized application is not utilized, so that the thickness of the connecting layer is comprehensively considered and designed to be 1-5 um.
Compared with the comparative example 1, the embodiment 1 shows that under the condition that the safety coating is the same, the introduction of the connecting layer can improve the surface resistance and the bulk resistance of the connecting layer + the aluminum foil, improve the DCIR of the battery, promote the discharge voltage platform of the battery, improve the gram capacity exertion of the active material, promote the energy density of the battery and improve the cycle performance of the battery.
Compared with the comparative example 2, the comparative example 1 shows that under the condition of no connecting layer, the surface resistance of the connecting layer and the current collector can be improved by increasing the conductivity of the safety coating through the conductive agent, and the volume resistance of the safety coating can be correspondingly reduced, so that the battery safety is reduced, and the needling test passing rate is reduced. Meanwhile, compared with comparative examples 3 and 4, the safety performance of the battery can be improved by increasing the thickness of the safety coating on the premise of improving the sheet resistance of the safety coating, and the same effect as that of the embodiment 1 can be achieved. In comparative example 3, since the thickness of the safety coating layer was increased too much, the thickness of the battery was increased and the energy density of the battery was lowered more than that of example 1. The comparative results show that the cell of example 1 can improve the sheet resistance of the safety coating layer by the introduction of the connection layer, and the sheet resistance between the connection layer + safety coating layer complex and the aluminum foil can be improved to 0.03-0.5. omega. cm 2 The thickness of the safety coating can be reduced by 30-50%, and the safety coating has good safety performance.
In comparison with example 4, in the case where the inorganic filler of the safety coating layer is boehmite, the effects of improving the needle punching safety performance and the like are similar to those of lithium manganese iron phosphate, but since boehmite does not have electrochemical activity and cannot exert capacity, the energy density of the battery is slightly low, and the bulk impedance and the surface impedance of the connection layer + the semi-finished electrode sheet 2 of the safety coating layer are slightly large, and it is necessary to increase a conductive agent to improve the conductivity. Therefore, the inorganic filler is preferably selected from lithium iron phosphate, lithium vanadium phosphate, lithium cobalt phosphate, lithium manganese phosphate, lithium iron manganese phosphate and the like in electrochemical active materials, and the electrochemical active materials can improve the over-safety performance of the battery; in addition, the carbon-coated electrochemically active material can also improve the cycle life of the battery.
In comparison with example 5, in example 1, the safety was still good by increasing the thickness of the safety coating layer, but as the thickness of the safety coating layer increased, the internal resistance of the battery increased and the cycle performance of the battery slightly decreased. In example 1, compared with comparative example 9, the safety coating is reduced to a certain thickness, the inorganic filler cannot densely cover the aluminum foil, the possibility of contact between graphite and the aluminum layer still exists, and the safety performance of the battery is reduced. The design of the safety coating needs to be maintained within a proper thickness range on the premise of satisfying the safety performance. The thickness of the security coating is 3-20 μm.
Compared with the embodiment 6 and the comparative example 7, the embodiment 1 has the advantages that the internal resistance of the pole piece is improved, the direct-current internal resistance of the battery is reduced and the cycle performance of the battery is improved by increasing the conductive agent of the safety coating. The conductive network can not be formed due to low content of the conductive agent of the safe coating, the volume resistance of the connecting layer and the semi-finished pole piece 2 of the safe coating is large, the capacity of the active material can not be exerted, and the energy density of the battery is obviously reduced. The formulation of the security coating needs to be designed reasonably. The weight portion ratio of the safe coating binder is 3-40, the conductive material is 5-25, and the inorganic filler is 92-35.
The above detailed description of one embodiment is given for illustrative and not restrictive purposes, and several embodiments may be enumerated within the scope of the definitions set forth, so that changes and modifications may be made without departing from the general inventive concept within the scope thereof.
Claims (6)
1. The utility model provides a positive pole piece, includes the mass flow body, safety coating and anodal active material layer, characterized by: the safety coating is characterized in that a connecting layer is arranged between the safety coating and the current collector, one side face or two side faces of the current collector are arranged in the connecting layer, the safety coating is arranged on the outer side of the connecting layer, and an active material layer is arranged on the outer side of the safety coating.
2. The positive electrode sheet as claimed in claim 1, wherein: the connecting layer comprises a conductive agent and a binder, and the components in parts by mass are as follows:
20-80 parts of conductive agent and 20-80 parts of binder.
3. The positive electrode sheet as claimed in claim 2, wherein: the binder is one or a mixture of Styrene Butadiene Rubber (SBR), Nitrile Butadiene Rubber (NBR), polyvinylidene fluoride (PVDF), sodium polyacrylate (PAA-Na) or lithium polyacrylate (PAA-lithium).
4. The positive electrode sheet as claimed in claim 2, wherein: the conductive agent is at least one of a conductive carbon-based material and a conductive metal material, wherein the conductive carbon-based material is at least one of furnace black, conductive carbon black, acetylene black, graphite, graphene, carbon nanotubes or carbon nanofibers.
5. The positive electrode sheet as claimed in claim 1 or 2, wherein: the thickness of the connecting layer is 1-5 μm.
6. A lithium ion battery is characterized in that: a lithium ion battery comprising the positive electrode sheet according to any one of claims 1 to 5.
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