CN115528211B - Pole piece for lithium ion battery and lithium ion battery - Google Patents
Pole piece for lithium ion battery and lithium ion battery Download PDFInfo
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- CN115528211B CN115528211B CN202211279896.2A CN202211279896A CN115528211B CN 115528211 B CN115528211 B CN 115528211B CN 202211279896 A CN202211279896 A CN 202211279896A CN 115528211 B CN115528211 B CN 115528211B
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- pole piece
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 55
- 239000011149 active material Substances 0.000 claims abstract description 29
- 239000006258 conductive agent Substances 0.000 claims abstract description 13
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 112
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 110
- 229910052751 metal Inorganic materials 0.000 claims description 95
- 239000002184 metal Substances 0.000 claims description 95
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 93
- 239000000203 mixture Substances 0.000 claims description 56
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 40
- 239000002041 carbon nanotube Substances 0.000 claims description 40
- 229910052799 carbon Inorganic materials 0.000 claims description 38
- 238000000576 coating method Methods 0.000 claims description 30
- 239000011248 coating agent Substances 0.000 claims description 29
- 239000002033 PVDF binder Substances 0.000 claims description 26
- 241000773945 Trimusculidae Species 0.000 claims description 26
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 26
- 239000011888 foil Substances 0.000 claims description 20
- 239000000853 adhesive Substances 0.000 claims description 19
- 230000001070 adhesive effect Effects 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229920006168 hydrated nitrile rubber Polymers 0.000 claims description 19
- 229910052710 silicon Inorganic materials 0.000 claims description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 16
- 229920002125 Sokalan® Polymers 0.000 claims description 16
- 239000010703 silicon Substances 0.000 claims description 16
- 239000007784 solid electrolyte Substances 0.000 claims description 15
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 239000004584 polyacrylic acid Substances 0.000 claims description 10
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 9
- 229910021389 graphene Inorganic materials 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 4
- 239000011889 copper foil Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 229910021385 hard carbon Inorganic materials 0.000 claims description 3
- 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 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 229910009178 Li1.3Al0.3Ti1.7(PO4)3 Inorganic materials 0.000 claims description 2
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002174 Styrene-butadiene Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 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 claims description 2
- 229920006184 cellulose methylcellulose Polymers 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N peroxyacetic acid Substances CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005518 polymer electrolyte Substances 0.000 claims description 2
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 2
- 229910021384 soft carbon Inorganic materials 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 claims 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 4
- 239000013543 active substance Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 59
- 238000000034 method Methods 0.000 description 39
- 239000003792 electrolyte Substances 0.000 description 34
- 238000005096 rolling process Methods 0.000 description 26
- 238000007789 sealing Methods 0.000 description 23
- 238000003825 pressing Methods 0.000 description 21
- 238000002156 mixing Methods 0.000 description 20
- 239000010405 anode material Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 8
- 229910021383 artificial graphite Inorganic materials 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000002391 graphite-based active material Substances 0.000 description 6
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 description 3
- 239000010406 cathode material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 239000006183 anode active material Substances 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000002388 carbon-based active material Substances 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 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
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002153 silicon-carbon composite material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a pole piece for a lithium ion battery and the lithium ion battery, wherein the pole piece for the lithium ion battery comprises a current collector and a conductive layer coated on the surface of the current collector, the thickness of the pole piece is 20-4000 um, and the conductive layer comprises the following components: 80.0 to 98.5wt.% active material; 0.1 to 10wt.% of a punctiform or planar conductive material; 0.01 to 5.0wt.% linear conductive agent; 0.2 to 10wt.% of a binder. The invention uses the electrode formula with high active substance content, reduces the weight and volume ratio of inactive materials, and obviously improves the energy density of the battery compared with the prior product. On the premise of ensuring that the endurance of the electronic product is unchanged, the weight and the volume of the battery are greatly reduced; on the premise of ensuring the unchanged volume of the battery, the product endurance time can be greatly improved.
Description
Technical Field
The invention relates to the field of battery manufacturing, in particular to a pole piece for a lithium ion battery and the lithium ion battery.
Background
The existing battery comprises a winding type and a lamination type typical structure, wherein the winding type structural battery is internally assembled by a positive electrode, a diaphragm and a negative electrode with certain lengths in a winding mode, and the number of winding layers is generally different from several layers to tens of layers; the laminated structure battery has several independent positive and negative electrode plates assembled together in laminated mode, with continuous separator layers between the positive and negative electrodes, and the number of positive and negative electrode layers between several and tens of sheets.
In the manufacturing process, the links of electrode manufacturing, cell assembly and the like have long flow, low efficiency and high cost. The slurry preparation of the anode and cathode materials needs to use an organic solvent and deionized water, and the coating process of the anode and cathode slurries needs to remove the solvent, so that a large amount of electricity is consumed. The coating thickness of the positive electrode plate and the negative electrode plate is less than or equal to 200um, and the single-sided capacity is less than or equal to 4mAh/cm 2 When in assembly, a large number of or longer lamellar positive electrodes and long lamellar negative electrodes are required to be alternately and reciprocally combined, so that the design size and capacity are achieved. The pollutants such as burrs, dust and the like easily form more micro short-circuit points in the manufacturing process of the pole piece, so that the reliability and the qualification rate of the battery can be influenced.
In addition, because the active coating of the positive electrode plate and the negative electrode plate is thinner, copper and aluminum foil current collectors are used for each layer, the positive electrode plate and the negative electrode plate are isolated by a diaphragm, the electrolyte is filled into the holes in the diaphragm after the electrolyte is filled, and the inactive material occupies more volume and weight in the battery, so that the active material ratio is reduced. Thus, battery energy density can be limited, affecting end product endurance and user experience.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a pole piece for a lithium ion battery and the lithium ion battery, wherein the lithium ion battery reduces the consumption of current collectors, diaphragms and electrolyte, and more active materials can be used in unit volume/weight, so that the energy density (Wh/kg and Wh/L) and the endurance time of a terminal product of the lithium ion battery can be obviously improved, the problems of low energy density, long production flow and low efficiency of the conventional small lithium ion battery are solved, the complexity of the production flow is greatly reduced, the efficiency is obviously improved, and the cost of the battery is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme: the pole piece for the lithium ion battery comprises a current collector and a conductive layer coated on the surface of the current collector, wherein the thickness of the pole piece is 20-4000 um, and the conductive layer comprises the following components: 80.0 to 98.5wt.% active material; 0.1 to 10wt.% of a punctiform or planar conductive material; 0.01 to 5.0wt.% linear conductive agent; 0.2 to 10wt.% of a binder. The current collector of the positive electrode plate is selected from any one of aluminum foil, aluminum net and aluminum foil with holes, the thickness of the current collector is 5-100 microns, one or two sides of the current collector can be coated with a layer of conductive adhesive, the conductive adhesive is selected from polyacrylic acid and conductive carbon, the thickness of the coating is 0.2-5 microns, and the layer of conductive adhesive can help to reduce contact resistance and improve the rate performance of the battery. The current collector of the negative electrode plate is selected from any one of copper foil, copper net and copper foil with holes, the thickness is 4-50um, one or two sides of the current collector can be coated with a layer of conductive adhesive, the conductive adhesive is selected from polyacrylic acid and conductive carbon, the thickness of the conductive adhesive layer is 0.2-5 um, and the conductive adhesive layer can help to reduce contact resistance and improve the multiplying power performance of the battery.
Preferably, the pole piece comprises a positive pole piece, and the active material in the conductive layer of the positive pole piece is selected from any one or more of lithium cobaltate, lithium nickel cobalt manganate, lithium iron phosphate, lithium manganate and lithium manganese iron phosphate;
The punctiform or planar conductive material is selected from any one or a mixture of more of carbon black, flake graphite and graphene;
the linear conductive agent is selected from any one or two mixtures of carbon nano tube CNT and carbon fiber;
the binder is selected from any one or more of polytetrafluoroethylene PTFE, polyvinylidene fluoride PVDF, polyacrylic acid PAA and hydrogenated nitrile butadiene rubber HNBR.
Preferably, the pole piece comprises a negative pole piece, and the active material in the conductive layer of the negative pole piece is selected from graphite, hard carbon, soft carbon, silicon oxide SiO x Lithiated SiO x -Li y SiO x Any one or more of graphite and silicon mixtures, metallic lithium, lithium titanate mixtures;
the punctiform or planar conductive material is carbon black;
the linear conductive agent is selected from carbon nano tubes or carbon fibers;
the binder is selected from any one or more of CMC, SBR, PTFE, PVDF, PAA, HNBR.
Preferably, the conductive layer further comprises an oxide solid electrolyte to increase ion transmission rate, the content of the oxide solid electrolyte is 0.1 to 15wt%, and the oxide solid electrolyte is selected from LATP-Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 、LLZO-Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 Any one of them.
Preferably, in order to improve the lithium ion conductivity of the pole piece, a plurality of through holes are formed in the pole piece, the through holes are distributed along the thickness direction of the pole piece and/or perpendicular to the thickness direction of the pole piece, the diameter of each through hole is 0.01 um-100 um, and the distance between adjacent through holes is 0.02-0.5 mm. Further, the diameters of holes uniformly distributed in the pole piece along the thickness direction are 0.01-100 um, the distance between the through holes is 0.05-0.5 mm, and the through holes penetrate through the thickness of the whole pole piece. The inside of the pole piece is uniformly distributed with the hole diameter of 0.01-100 um and the hole spacing of 0.02-0.1 mm along the thickness direction of the vertical pole piece.
Preferably, the pole piece is formed by compounding a plurality of layers of films, and the films are formed by pressing active materials, point-shaped or plane-shaped conductive materials, linear conductive agents and adhesives in a rolling mode. A transition layer is arranged between the diaphragms for improving the electron and ion conductivity of the pole pieces. The thickness of the membrane is 50-500 um, and the thickness of the transition layer is 5-25 um. The transition layer comprises a mixture of any one or more of the following components, the composition of which comprises:
1) The thickness of the aluminum foil or aluminum net with holes is 5-25 um, and the surface of the aluminum foil or aluminum net is coated with a conductive layer or ion-conducting layer, such as solid electrolyte materials LATP, LLZO and the like, and the thickness of the conductive layer or ion-conducting layer is not more than 5um; the aluminum foil or the aluminum net can also be provided with a leading-out tab which is welded on the positive tab in parallel;
2) An electron conductive layer composed of a conductive agent and a binder, wherein the conductive agent is selected from any one of conductive carbon black, carbon nanotubes and graphene;
3) Ion-conducting layers composed of solid electrolytes or polymer electrolytes (e.g., PEO, etc.);
4) An intermediate layer having a double function of conducting electrons and conducting ions;
5) An intermediate layer with capacitance characteristic is composed of active carbon, conductive agent and binder.
Preferably, the pole piece is provided with a metal lithium foil layer or a metal lithium sheet layer on one side opposite to the adjacent pole piece, the thickness of the metal lithium foil layer or the lithium sheet layer is 20-1000 um, and the metal lithium foil layer or the lithium sheet layer has the same shape and the same area as the pole piece. The active lithium consumption caused by the formation of a solid electrolyte film (SEI film) on the surface of the anode active material is reduced by arranging a layer of metal lithium foil on one side of the anode pole piece opposite to the anode pole piece or arranging a metal lithium foil/metal lithium sheet layer on one side of the anode pole piece opposite to the anode pole piece, so as to reduce irreversible capacity loss of the battery in the first charge and discharge process, and improve the first charge and discharge efficiency of the battery, especially when the anode is a silicon anode or a silicon-carbon composite anode. Because the metal lithium is very soft, a metal lithium foil layer or a lithium sheet layer can be firstly stuck on the surface of the positive electrode sheet or the negative electrode sheet before the battery is assembled.
Preferably, the metallic lithium foil layer or the lithium sheet layer is provided with pores, the porosity is 1-80%, and the diameter of the pores is 0.05-2 mm.
The lithium ion battery comprises a positive electrode plate, a negative electrode plate and a diaphragm, wherein the positive electrode plate and/or the negative electrode plate are/is the electrode plate for the lithium ion battery.
Preferably, the number of the positive electrode plate, the negative electrode plate and the separator is one.
Preferably, the thickness of the diaphragm is 5-250 um, the thickness of the positive electrode plate is 40-4000 um, and the thickness of the negative electrode plate is 20-3000 um.
Preferably, the button further comprises button shells arranged outside the positive electrode plate and the negative electrode plate, wherein the negative electrode plate, the diaphragm and the positive electrode plate are sequentially arranged from the bottom of the button shell upwards, the diameter of the positive electrode plate is 5-20 mm, and the diameter of the diaphragm is 6-22 mm; the diameter of the negative pole piece is 5.6-21 mm, the diameter of the button shell is 6.1-22.1 mm, the thickness of the button shell is 0.05-0.2 mm, the button further comprises an insulating sleeve arranged between the button shell and the pole piece, the insulating sleeve height=positive pole piece thickness+diaphragm thickness+negative pole piece thickness + -0.2 mm, the button further comprises a top cover arranged above the positive pole piece, the diameter of the top cover is 5-21 mm, and the thickness of the top cover is 0.05-0.2 mm. During assembly, the negative electrode plate is firstly placed in the button, then the diaphragm, the positive electrode plate and the insulating sleeve are sequentially placed, at the moment, the negative electrode is required to be ensured to completely cover the positive electrode plate and the insulating sleeve, then electrolyte is added, the electrolyte amount is not less than the sum of the volumes of the internal holes of the electrode and the diaphragm, and finally the top cover is arranged for sealing.
Wherein: the membrane is selected from PP, PE, PET, PI, non-woven fabric membrane and aramid membraneAny one or a plurality of combinations, the porosity is 30-75%, the thickness is 5-50 microns, wherein one or two sides of the base film can be coated with Al with the thickness of 1-5 microns 2 O 3 Or boehmite ceramic coating; solid electrolyte separator layers (porosity)<10%) thickness of<250 microns; and a layer of solid electrolyte (LATP, LLZO, etc.) can be sprayed on the surface of the negative electrode plate in a spray coating and transfer coating mode, and the thickness is 6-30 um.
The insulating sleeve requires electrical insulation and is resistant to electrolyte corrosion. The insulating sleeve is made of any one of PP, PI, PET and has a thickness of 0.02-0.5 mm.
Preferably, a metal sheet is arranged on one side of the positive electrode plate far away from the negative electrode plate and/or one side of the negative electrode plate far away from the positive electrode plate, the metal sheet is made of aluminum foil or copper foil, the thickness of the metal sheet is 5 um-25 um, and the diameter of the metal sheet is consistent with that of the positive electrode plate or the negative electrode plate. Active lithium consumption caused by formation of solid electrolyte film (SEI film) on the surface of the negative active material is reduced by arranging a metal sheet on one side of the positive electrode plate far away from the negative electrode plate and/or on the side of the negative electrode plate far away from the positive electrode plate, so as to reduce irreversible capacity loss of the battery in the first charge and discharge process, thereby improving the first charge and discharge efficiency of the battery, especially when the negative electrode plate is a silicon-containing negative electrode (Gr+SiO x 、Gr+Li y SiO x 、Gr+Si、Si、Li y SiO x Etc.). Since lithium metal is very soft, it can be attached to the surface of the negative electrode before the battery is assembled.
Preferably, one or two sides of the metal sheet are coated with a layer of conductive adhesive, the thickness of the conductive adhesive coating is 0.2-5 um, and the conductive adhesive is selected from polyacrylic acid and conductive carbon. The conductive adhesive layer can help to reduce the contact resistance between the positive electrode plate and the top cover and improve the rate performance of the battery.
Preferably, the surface of the positive electrode plate close to one side of the top cover is coated with a layer of conductive adhesive, the thickness of the conductive adhesive coating is 0.2-5 um, and the conductive adhesive is selected from polyacrylic acid and conductive carbon. The conductive adhesive coating is arranged to reduce internal contact resistance.
Preferably, the positive pole piece is provided with gradient distribution porosity structures along the thickness direction of the pole piece, and the porosity of the positive pole piece on the side opposite to the negative pole piece is higher than that of the positive pole piece on the side close to the top cover.
Preferably, the lithium ion battery comprises two single-sided negative electrode plates, a double-sided positive electrode plate and two diaphragms, wherein the single-sided negative electrode plate, the diaphragm layer, the double-sided positive electrode plate, the diaphragm layer and the other single-sided negative electrode plate are sequentially stacked.
The assembly method comprises the following steps: during assembly, the single-sided negative electrode plate, the diaphragm layer, the double-sided positive electrode plate, the diaphragm layer and the other single-sided negative electrode plate are sequentially stacked, the double-sided positive electrode plate, the diaphragm and the single-sided negative electrode plate are bonded together through a hot pressing process, then the double-sided positive electrode plate tab is welded to the external lead-out positive electrode tab, the single-sided negative electrode plate tab is welded to the external lead-out negative electrode tab in parallel, then the pressed battery cell is placed into an aluminum plastic film for packaging, electrolyte is injected and sealing is carried out, and sometimes drying is needed first, and finally formation, vacuumizing, secondary sealing and capacity division are carried out to obtain a finished battery cell. This structure can double the battery capacity. The battery cell assembly can be carried out by using a section of continuous diaphragm, and the battery cell can be well folded by sequentially placing a single-sided pole piece, folding the diaphragm, placing a double-sided pole piece, folding the diaphragm and placing the single-sided pole piece on the diaphragm layer and then wrapping the battery cell by using the diaphragm for one or more circles.
Preferably, the lithium ion battery comprises two single-sided positive pole pieces, a double-sided negative pole piece and two diaphragms, wherein the single-sided positive pole pieces, the diaphragms, the double-sided negative pole pieces, the diaphragms and the other single-sided positive pole piece are sequentially stacked.
The beneficial effects of the invention are as follows:
1) The invention uses electrode formulation with high active material content, and the battery energy is high.
2) The weight and the volume ratio of the inactive material are reduced, and the energy density of the battery is obviously improved compared with the prior product. On the premise of ensuring that the endurance of the electronic product is unchanged, the weight and the volume of the battery are greatly reduced; on the premise of ensuring the unchanged volume of the battery, the product endurance time can be greatly improved.
3) Unlike conventional lithium batteries, button cells of the present invention use button cell top covers and cases as positive and negative current collectors, respectively. Simplified design, short manufacturing flow, improved energy density, reduced current collector and diaphragm consumption, and greatly reduced battery manufacturing complexity and cost.
Drawings
FIG. 1 is a schematic view showing the connection of the internal structure of button cells in examples 1 to 16;
FIG. 2 is a schematic view of the embodiment 3 in which through holes are provided in the pole piece in the direction perpendicular to the thickness direction of the pole piece;
FIG. 3 is a schematic view showing the arrangement of through holes in the thickness direction of the pole piece in example 4;
FIG. 4 is a schematic view of the embodiment 5 in which through holes are formed in the pole piece along the thickness direction of the perpendicular pole piece;
FIG. 5 is a schematic view of the interior of the pole piece of example 10;
fig. 6 is a schematic view showing the connection of the internal structure of the laminated battery in example 17;
fig. 7 is a schematic view showing the connection of the internal structure of the laminated battery in example 18;
fig. 8 is a schematic view showing the internal structural connection of the laminated battery in example 19.
In the figure:
1. a pole piece; 11. a positive electrode sheet; 12. a negative electrode plate; 13. a through hole; 16. a transition layer; 2. a diaphragm; 3. an insulating sleeve; 4. a top cover; 5. button shell; 6. an electrolyte; 7. a tab; 8. and (3) an aluminum plastic film.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Example 1
90wt.% of lithium cobaltate active material was uniformly mixed with 3wt.% of conductive carbon, 2wt.% of carbon nanotube CNT, and 5wt.% of polytetrafluoroethylene PTFE, the mixture was coated on both sides of a current collector, and then a positive electrode sheet having a thickness of 2.0 mm and an areal density of 0.8g/cm2 was pressed by a roll press method, and the sheet was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die.
92wt.% of artificial graphite active material was uniformly mixed with 2wt.% of conductive carbon, 1wt.% of carbon nanotube CNT, and 5wt.% of hydrogenated nitrile butadiene rubber HNBR, the mixture was coated on both sides of a current collector, and then negative electrode sheets having a thickness of 2.2 mm and an areal density of 0.36g/cm2 were pressed by means of rolling, and the sheets were die-cut into negative electrode tabs 12 for button cells having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into the button casing 5 having a diameter of 12mm, and then the PP/PE separator 2 having a thickness of 13 μm and a diameter of 11 mm and the positive electrode sheet 11 were sequentially stacked. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 5.4mm is obtained, and the normal-temperature charge-discharge capacity of the button cell is not less than 65mAh.
Example 2
94wt.% of lithium nickel cobalt manganese oxide active material is uniformly mixed with 0.1wt.% of graphite flakes, 0.01wt.% of carbon fibers, and 5.89wt.% of hydrogenated nitrile butadiene rubber HNBR, the mixture is coated on both sides of a current collector, and then pressed into a sheet with a thickness of 3 mm and an areal density of 0.8g/cm by a rolling method 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 8mm using a die.
94wt.% of hard carbon active material was uniformly mixed with 2wt.% of conductive carbon, 1wt.% of carbon nanotube CNT, and 5wt.% of hydrogenated nitrile butadiene rubber HNBR, the mixture was coated on both sides of a current collector, and then pressed by a roll press to a thickness of 2.8 mm, an areal density of 0.50g/cm 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into a button cell case having a diameter of 11mm, and then a PP/PE separator 2 having a thickness of 20 μm and a diameter of 10mm and the positive electrode sheet 11 were sequentially stacked. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 11mm and the thickness of not more than 7.0mm is obtained, and the normal-temperature charge-discharge capacity of the button cell is not less than 65mAh.
Example 3
Referring to fig. 2, 90wt.% of lithium cobaltate active material was uniformly mixed with 3wt.% of conductive carbon, 2wt.% of carbon nanotube CNT, and 5wt.% of PTFE, the mixture was coated on both sides of a current collector, and then pressed to a thickness of 2.0 mm by a roll press method, and an areal density of 0.8g/cm 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die. Then, a laser was used to make a through hole 13 with a diameter of 0.05mm along the surface of the vertical pole piece, and the distance between the through hole 13 and the adjacent through hole 13 was 0.2 to 1.5mm, thereby obtaining a tape Kong Zhengji pole piece 11.
92% of artificial graphite active material was uniformly mixed with 2 wt% of conductive carbon, 1 wt% of carbon nanotube CNT, and 5 wt% of HNBR, the mixture was coated on both sides of a current collector, and then pressed into a sheet having a thickness of 2.2 mm and an areal density of 0.36g/cm by a roll press method 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die. Then, a through hole 13 having a diameter of 0.05mm was punched along the surface of the vertical pole piece using a laser, and the straight distance between the through hole 13 and the through hole 13 was 0.2mm, thereby obtaining a tape Kong Fuji pole piece 12.
The tape Kong Fuji pole piece 12 was placed in a button cell case of 12mm diameter, and then a PP/PE separator 2 of 13 μm thickness and 11 mm diameter and a positive pole piece 11 with a hole were laminated in order. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 5.4mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 4
Referring to fig. 3, 98wt.% of lithium cobaltate active material was uniformly mixed with 0.5wt.% of conductive carbon, 0.4wt.% of carbon nanotube CNT, and 1.1wt.% of PTFE, the mixture was coated on both sides of a current collector, and then pressed by a roll press to a thickness of 2.0 mm and an areal density of 0.8g/cm 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die. Then, a through hole 13 having a diameter of 0.05mm was punched in the thickness direction of the pole piece using a laser, and the distance between the through hole 13 and the through hole 13 was 0.2mm, thereby obtaining a tape Kong Zhengji pole piece 11.
95% artificial graphite active material was uniformly mixed with 0.8wt.% of conductive carbon, 1.3wt.% of carbon nanotube CNT, and 2.9wt.% of HNBR, the mixture was coated on both sides of a current collector, and then pressed by a roll press to a thickness of 2.6 mm, and an areal density of 0.38g/cm 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die. Then, a through hole 13 having a diameter of 0.01mm was punched in the thickness direction of the pole piece using a laser, and the linear distance between the through hole 13 and the through hole 13 was 0.05mm, thereby obtaining a tape Kong Fuji pole piece 12.
The tape Kong Fuji pole piece 12 was placed in a button cell case of 12mm diameter, and then a PP/PE separator 2 of 20 μm thickness and 11 mm diameter and a positive pole piece 11 with a hole were laminated in order. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 5.4mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 5
As described with reference to fig. 4, the difference between the present embodiment and embodiment 3 and embodiment 4 is that: in this embodiment, through holes 13 in two directions are provided in the pole piece, the through holes 13 in the first direction are the same as the through holes 13 described in embodiment 3, and the through holes 13 in the second direction are the same as the through holes 14 described in embodiment 4.
Example 6
Uniformly mixing 90wt.% of lithium iron phosphate active material with 3wt.% of graphene, 2wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on both sides of a current collector, and pressing into a thickness of 3.4 mm and an areal density of 1.36g/cm by rolling 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die.
Uniformly mixing 80wt.% of pure silicon anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 0.6 mm and an areal density of 0.1g/cm by rolling 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into a button cell case having a diameter of 12mm, and then a separator 2 having a thickness of 20 μm and a diameter of 11 mm, a metal lithium sheet or a metal lithium sheet with a hole having a thickness of 0.6 mm and a diameter of 9mm, and a positive electrode sheet 11 were sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.6 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a diaphragm 2 with the thickness of 20 micrometers and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 7.0mm is obtained, and the normal temperature charge and discharge capacity of the cell is not less than 110mAh.
Example 7:
uniformly mixing 90wt.% of lithium manganese iron phosphate active material with 3wt.% of graphene, 2wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 4.1 mm and an areal density of 1.36g/cm by a rolling method 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die.
Uniformly mixing 80wt.% of pure silicon anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 1.0 mm and an areal density of 0.1g/cm by rolling 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into a button cell case having a diameter of 12mm, and then a separator 2 having a thickness of 50 μm and a diameter of 11 mm, a metal lithium sheet or a metal lithium sheet with a hole having a thickness of 0.9 mm and a diameter of 9mm, and a positive electrode sheet 11 were sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.9 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a diaphragm 2 with the thickness of 50 micrometers and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 7.0mm is obtained, and the normal temperature charge and discharge capacity of the cell is not less than 110mAh.
Example 8
Mixing 90wt.% lithium cobaltate active material with 3wt.% conductive carbon, 2wt.% carbon nanotube CNT, and 5wt.% lithium manganate uniformly, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 2.0-2.4 mm and an areal density of 0.8g/cm by rolling 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die.
Uniformly mixing 80wt.% of silicon anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT and 5wt.% of hydrogenated nitrile butadiene rubber HNBR, coating the mixture on two sides of a current collector, and pressing the mixture into a sheet with a thickness of 0.35 mm and an areal density of 0.06g/cm by a rolling method 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into a button cell case having a diameter of 12mm, and then a separator 2 having a thickness of 20 μm and a diameter of 11 mm, a metal lithium sheet or a metal lithium sheet with a hole having a thickness of 0.4 mm and a diameter of 9mm, and a positive electrode sheet 11 were sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.4 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a diaphragm 2 with the thickness of 20 micrometers and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 3.5mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 9
Mixing 90wt.% lithium cobaltate active material with 3wt.% conductive carbon, 2wt.% carbon nanotube CNT, and 5wt.% lithium manganate uniformly, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 2.4 mm and an areal density of 0.8g/cm by rolling 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die.
Uniformly mixing 80wt.% of silicon anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT and 5wt.% of hydrogenated nitrile butadiene rubber HNBR, coating the mixture on both sides of a current collector, and pressing the mixture into a sheet with a thickness of 0.6 mm and an areal density of 0.06g/cm by a rolling method 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into a button cell case having a diameter of 12mm, and then a separator 2 having a thickness of 20 μm and a diameter of 11 mm, a metal lithium sheet or a metal lithium sheet with a hole having a thickness of 0.6 mm and a diameter of 9mm, and a positive electrode sheet 11 were sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.6 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a diaphragm 2 with the thickness of 20 micrometers and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 3.5mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 10
Referring to fig. 5, 90wt.% of lithium cobaltate active material was uniformly mixed with 3wt.% of conductive carbon, 2wt.% of carbon nanotube CNT, and 5wt.% of PTFE, the mixture was coated on both sides of a current collector, and then pressed to a thickness of 0.5 mm by a roll press method, and an areal density of 0.2g/cm 2 The film was die-cut into positive electrode single pieces having a diameter of 9mm using a die. Four positive monoliths were stacked in registry, each two provided with a transition layer 16, a tape Kong Lvbo of 0.005 mm thickness of the transition layer 16, pressed into the final positive membrane using a pressure of 4 psi. Where psi is the unit of pressure, in pounds force per square inch, 1bar ≡14.5psi.
92wt.% of artificial graphite active material was uniformly mixed with 2wt.% of conductive carbon, 1wt.% of carbon nanotube CNT, and 5wt.% of HNBR, the mixture was coated on both sides of a current collector, and then pressed by a roll press to a thickness of 0.5 mm, and an areal density of 0.09g/cm 2 The negative electrode sheet of (2) was punched into a negative electrode single sheet having a diameter of 10mm using a die. Four negative electrode monoliths were stacked in registry with a 0.005 mm layer of tape Kong Tongbo sandwiched between each two, and pressed into the final negative electrode membrane using a pressure of 4 psi.
The negative electrode membrane was placed in a button cell case having a diameter of 12mm, and then a PP/PE separator 2 having a thickness of 25 μm and a diameter of 11 mm and the positive electrode membrane were sequentially stacked. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 5.4mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 11
Uniformly mixing 90wt.% of lithium cobaltate active material with 3wt.% of conductive carbon, 2wt.% of carbon nanotube CNT, and 5wt.% of PTFE, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 0.6 mm and an areal density of 0.2g/cm by rolling 2 The film was die-cut into positive electrode single pieces having a diameter of 9mm using a die. Four positive electrode monoliths were stacked in registry with a 0.016 mm layer of tape Kong Lvbo sandwiched between each two, and pressed into the final positive electrode sheet 11 using a pressure of 50 psi.
92wt.% of artificial graphite active material was uniformly mixed with 2wt.% of conductive carbon, 1wt.% of carbon nanotube CNT, and 5wt.% of HNBR, the mixture was coated on both sides of a current collector, and then pressed by a roll press to a thickness of 0.6 mm, and an areal density of 0.09g/cm 2 The negative electrode sheet of (2) was punched into a negative electrode single sheet having a diameter of 10mm using a die. Four negative electrode monoliths were stacked in registry with a 0.01 mm layer of tape Kong Tongbo sandwiched between each two, and pressed into the final negative electrode sheet 12 using a pressure of 50 psi.
The negative electrode sheet 12 was put into a button cell case having a diameter of 12mm, and then a PP/PE separator 2 having a thickness of 20 μm and a diameter of 11 mm and the positive electrode sheet 11 were sequentially stacked. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, the lithium ion battery electrolyte 6 is injected, the button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 5.4mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 12:
mixing 90wt.% lithium cobaltate active material with 3wt.% conductive carbon, 2wt.% carbon nanotube CNT, and 5wt.% HNBR uniformly, coating the mixture on both sides of a current collector, and pressing into a thickness of 0.6 mm and an areal density of 0.2g/cm by rolling 2 The film was die-cut into positive electrode single pieces having a diameter of 9mm using a die. Four positive electrode monoliths were stacked in registry with a 0.016 mm layer of tape Kong Lvbo sandwiched between each two, and pressed into the final positive electrode sheet 11 using a pressure of 40 psi.
Uniformly mixing 85wt.% of silicon anode material with 5wt.% of conductive carbon, 8wt.% of carbon nanotube CNT and 2wt.% of HNBR, coating the mixture on both sides of a current collector, and pressing the mixture into a sheet with a thickness of 0.15 mm and an areal density of 0.025g/cm by a rolling method 2 The film was die cut into a negative electrode single piece having a diameter of 10mm using a die. Four negative electrode monoliths were stacked in registry with a 0.01 mm layer of tape Kong Tongbo sandwiched between each two, and pressed into the final negative electrode sheet 12 using a pressure of 40 psi.
The negative electrode sheet 12 is put into a button cell case with a diameter of 12mm, and then a PP/PE diaphragm 2 with a thickness of 13 micrometers and a diameter of 11 mm, a metal lithium sheet with a thickness of 0.9 mm and a diameter of 9mm or a metal lithium sheet with holes and a positive electrode sheet 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.9 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a PP/PE diaphragm 2 with the thickness of 13 micrometers and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 7.0mm is obtained, and the normal temperature charge and discharge capacity of the cell is not less than 110mAh.
Example 13:
mixing 90wt.% lithium cobaltate active material with 3wt.% conductive carbon, 2wt.% carbon nanotube CNT, and 5wt.% HNBR uniformly, coating the mixture on both sides of a current collector, and pressing into a thickness of 0.6 mm and an areal density of 0.2g/cm by rolling 2 The film was die-cut into positive electrode single pieces having a diameter of 9mm using a die. Four positive electrode sheets were stacked in alignment with a 0.016 mm layer of tape Kong Lvbo sandwiched between each two sheets, and pressed into the final positive electrode sheet 11 using a pressure of 4.
Uniformly mixing 85wt.% of silicon anode material with 5wt.% of conductive carbon, 8wt.% of carbon nanotube CNT and 2wt.% of HNBR, coating the mixture on both sides of a current collector, and pressing the mixture into a sheet with a thickness of 0.25 mm and an areal density of 0.025g/cm by a rolling method 2 The film was die cut into a negative electrode single piece having a diameter of 10mm using a die. Four negative electrode monoliths were stacked in registry with a 0.005 mm layer of tape Kong Tongbo sandwiched between each two, and pressed into the final negative electrode sheet 12 using a pressure of 4 psi.
The negative electrode sheet 12 is put into a button cell case with a diameter of 12mm, and then a PP/PE diaphragm 2 with a thickness of 16 micrometers and a diameter of 11 mm, a metal lithium sheet with a thickness of 0.6 mm and a diameter of 9mm or a metal lithium sheet with holes and a positive electrode sheet 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.6 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a PP/PE diaphragm 2 with the thickness of 16 microns and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 7.0mm is obtained, and the normal temperature charge and discharge capacity of the cell is not less than 110mAh.
Example 14
92wt.% of lithium manganate active material was uniformly mixed with 1wt.% of conductive carbon, 3wt.% of carbon nanotube CNT, and 4wt.% of polyacrylic acid PAA, the mixture was coated on both sides of a current collector, and then pressed into a sheet with a thickness of 0.4 mm and an areal density of 0.2g/cm by means of rolling 2 The film was die-cut into positive electrode single pieces having a diameter of 9mm using a die. The two positive electrode monoliths were stacked in registry with a 0.01 mm tape Kong Lvbo sandwiched between them and pressed into the final positive electrode sheet 11 using a pressure of 10 psi.
Mixing 85wt.% silicon cathode material with 5wt.% conductive carbon, 4wt.% carbon nanotube CNT, and 6wt.% polyacrylic acid PAA, coating the mixture on two sides of a current collector, and pressing into a sheet with a thickness of 0.25 mm and an areal density of 0.025g/cm by rolling 2 The film was die cut into a negative electrode single piece having a diameter of 10mm using a die. Two negative electrode monoliths were stacked in registry with a 0.005 mm layer of tape Kong Tongbo sandwiched between them and pressed into the final negative electrode sheet 12 using a pressure of 10 psi.
The negative electrode film was put into a button cell case having a diameter of 12mm, and then a PP/PE separator 2 having a thickness of 13 μm and a diameter of 11 mm, a metal lithium sheet or a metal lithium sheet with a hole having a thickness of 0.4 mm and a diameter of 9mm, and a positive electrode film 11 were sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.4 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a PP/PE diaphragm 2 with the thickness of 13 micrometers and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 3.5mm is obtained, and the normal temperature charge-discharge capacity of the cell is not less than 60mAh.
Example 15
Uniformly mixing 95wt.% lithium manganate active material with 0.5wt.% conductive carbon, 0.5wt.% carbon nanotube CNT, and 4wt.% PTFE, coating the mixture on both sides of a current collector, and pressing into a thickness of 0.6 mm and an areal density of 0.2g/cm by rolling 2 The film was die-cut into positive electrode single pieces having a diameter of 9mm using a die. The two positive monoliths were stacked in registry with a 0.016 mm tape Kong Lvbo sandwiched between them and pressed into the final positive electrode sheet 11 using a pressure of 40 psi.
Uniformly mixing 95wt.% of silicon anode material with 0.5wt.% of conductive carbon, 0.5wt.% of carbon nanotube CNT, and 4wt.% of HNBR, coating the mixture on both sides of a current collector, and pressing the mixture into a thickness of 0.15 mm and an areal density of 0.025g/cm by rolling 2 The film was die cut into a negative electrode single piece having a diameter of 10mm using a die. Stacking two negative electrode sheets in alignment with a 0.005 mm tape Kong Tongbo sandwiched therebetween, usingThe pressure of 40 presses it into the final negative electrode sheet 12.
The negative electrode sheet 12 is put into a button cell case with a diameter of 12mm, and then a PP/PE diaphragm 2 with a thickness of 16 micrometers and a diameter of 11 mm, a metal lithium sheet with a thickness of 0.6 mm and a diameter of 9mm or a metal lithium sheet with holes and a positive electrode sheet 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the positive electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting with the edge of the button shell. Or the negative electrode plate 12 is put into a button cell shell with the diameter of 12mm, a metal lithium sheet or a metal lithium sheet with holes with the thickness of 0.6 mm and the diameter of 10mm is stuck on the surface of the negative electrode plate, and then a PP/PE diaphragm 2 with the thickness of 16 microns and the diameter of 11 mm and a positive electrode plate 11 are sequentially stacked. This process needs to ensure that the separator 2 completely covers the negative electrode plate 12, the negative electrode plate 12 completely covers the positive electrode plate 11, a metal lithium plate or a metal lithium plate with holes is just stuck on the surface of the negative electrode plate 11, and then the PET insulating sleeve 3 is sleeved to prevent the positive electrode plate 11 from contacting the edge of the button shell. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 3.5mm is obtained, and the normal temperature charge-discharge capacity of the cell is not less than 60mAh.
Example 16:
uniformly mixing 90wt.% of lithium cobaltate active material with 2wt.% of conductive carbon, 1wt.% of carbon nanotube CNT, 3wt.% of oxide solid electrolyte LATP and 4wt.% of HNBR, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 2.0 mm and an areal density of 0.8g/cm by rolling 2 The film was die-cut into a button cell positive electrode sheet 11 having a diameter of 9mm using a die.
92wt.% of artificial graphite active material was mixed uniformly with 2wt.% of conductive carbon, 1wt.% of carbon nanotube CNT, 1wt.% of oxide solid electrolyte LLZO, and 4wt.% of PTFE, and the mixture was mixedThe composition was applied to both sides of a current collector and then pressed by rolling to a thickness of 2.5 mm and an areal density of 0.36g/cm 2 The film was die cut into a button cell negative electrode sheet 12 having a diameter of 10mm using a die.
The negative electrode sheet 12 was put into a button cell case having a diameter of 12mm, and then a PP/PE separator 2 having a thickness of 13 μm and a diameter of 11 mm and the positive electrode sheet 11 were sequentially stacked. This procedure requires ensuring that the separator 2 completely covers the negative electrode sheet 12, that the negative electrode sheet 12 completely covers the positive electrode sheet 11, and that the PET insulating sleeve 3 is then applied to prevent the positive electrode sheet 11 from coming into contact with the edge of the button casing. Then, not more than 1 gram of lithium ion battery electrolyte 6 is injected (the electrolyte 6 can be soaked in vacuum, the vacuum can be used for accelerating), a button battery top cover 4 is covered on the positive electrode plate 11, and the button battery is sealed by a sealing machine. Finally, the button cell with the diameter of 12mm and the thickness of not more than 6.0mm is obtained, and the normal-temperature charge-discharge capacity of the cell is not less than 65mAh.
Example 17:
referring to fig. 6, 90wt.% of lithium iron phosphate active material was uniformly mixed with 3wt.% of graphene, 2wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, the mixture was coated on one side of a current collector, and then pressed by a roll press to a thickness of 4.1 mm and an areal density of 1.36g/cm 2 The positive electrode sheet 11 of the battery is punched out of the sheet using a die.
Uniformly mixing 80wt.% of silicon-containing anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on one side of a current collector, and pressing into a sheet with a thickness of 1.0mm and an areal density of 0.1g/cm by rolling 2 Is die cut into battery negative electrode tabs 12 using a die. The length and width directions of the negative electrode plate 12 are larger than those of the positive electrode plate 11, so that the positive electrode plate 11 can be completely covered.
The positive electrode pole piece 11 and the negative electrode pole piece 12 are welded respectively to lead out the tab 7, a metal lithium sheet or a metal lithium sheet with holes, the thickness of which is 0.2-1.0 mm, is attached to the surface of the positive electrode pole piece 11 or the negative electrode pole piece 12, the size of which is the same as that of the positive electrode pole piece 11 or the negative electrode pole piece 12, the diaphragm 2 and the positive electrode pole piece 11 are stacked to form a battery cell, the stacked battery cell is placed into an aluminum plastic film 8 for packaging, then electrolyte 6 is injected, sealing is carried out, and finally formation, vacuumizing and secondary sealing and capacity division are carried out to obtain a finished battery cell.
Example 18:
referring to fig. 7, 90wt.% of lithium iron phosphate active material was uniformly mixed with 3wt.% of graphene, 2wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, the mixture was coated on both sides of a current collector, and then pressed by a roll press to a thickness of 4.1 mm and an areal density of 1.36g/cm 2 The film is die-cut into double-sided battery positive electrode sheet 11 using a die.
Uniformly mixing 80wt.% of silicon-containing anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on one side of a current collector, and pressing into a sheet with a thickness of 1.0mm and an areal density of 0.1g/cm by rolling 2 Is die cut into a single-sided battery negative electrode tab 121 using a die.
And (3) attaching metal lithium sheets or metal lithium sheets with holes, which are 0.2-1.0 mm in thickness and same in size as the positive electrode sheet 11 or the negative electrode sheet 121, on the two side surfaces of the positive electrode sheet 11 or the negative electrode sheet 121, sequentially placing one single-sided negative electrode sheet 121, the diaphragm 2, the double-sided positive electrode sheet 11, the diaphragm 2 and the other single-sided negative electrode sheet 121 during assembly, bonding the negative electrode sheet, the diaphragm 2 and the positive electrode sheet together by using a hot pressing process to obtain a stacked battery cell, respectively welding external lugs on the two single-sided negative electrode sheet 121 and the double-sided positive electrode sheet 11 which are connected in parallel, then placing the battery cell into an aluminum plastic film 8 for packaging, then injecting electrolyte 6, sealing, and finally performing formation, vacuumizing secondary sealing and capacity division to obtain a finished battery cell. The battery cell with the structure can double the capacity of the battery.
Example 19:
referring to fig. 8, 90wt.% of lithium iron phosphate active material was uniformly mixed with 3wt.% of graphene, 2wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF,the mixture was applied to one side of a current collector and then pressed by rolling to a thickness of 3 mm and an areal density of 1.36g/cm 2 The film is die-cut into a single-sided positive electrode sheet 111 using a die.
Uniformly mixing 80wt.% of silicon-containing anode material with 10wt.% of conductive carbon, 5wt.% of carbon nanotube CNT, and 5wt.% of polyvinylidene fluoride PVDF, coating the mixture on both sides of a current collector, and pressing into a sheet with a thickness of 2.0 mm and an areal density of 0.1g/cm by rolling 2 Is die cut into double-sided negative electrode sheet 12 using a die.
And (3) attaching metal lithium sheets or metal lithium sheets with holes, which are 0.2-1.0 mm in thickness and same in size as the positive electrode sheet 111 or the negative electrode sheet 12, on the surface of the positive electrode sheet 111 or the two side surfaces of the negative electrode sheet 12, sequentially stacking the single-sided positive electrode sheet 111, the diaphragm 2, the double-sided negative electrode sheet 12, the diaphragm 2 and the other single-sided positive electrode sheet 111 during assembly, bonding the double-sided negative electrode sheet 12, the diaphragm 2 and the single-sided positive electrode sheet 111 together by using a hot pressing process to obtain a stacked battery cell, respectively welding external lugs on the two layers of the single-sided positive electrode sheet 111 and the double-sided negative electrode sheet 12 which are connected in parallel, then placing the stacked battery cell into an aluminum plastic film 8 for packaging, then injecting electrolyte 6, sealing, and finally performing formation, vacuumizing two-package and capacity division to obtain a finished battery cell. The battery cell with the structure can double the capacity of the battery.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (18)
1. The pole piece for the lithium ion battery is characterized by comprising a current collector and a conductive layer coated on the surface of the current collector, wherein the thickness of the pole piece is 250-4000 um, and the conductive layer comprises the following components: 80.0 to 98.5wt.% active material; 0.1 to 10wt.% of a punctiform or planar conductive material; 0.01 to 5.0wt.% linear conductive agent; 0.2 to 10wt.% of a binder;
the pole piece is formed by compounding a plurality of layers of films, and a transition layer is arranged between the films;
the transition layer comprises any one or a mixture of more of the following components, the composition of which comprises:
1) A layer of conductive layer or ion conductive layer is coated on the surface of the aluminum foil or aluminum net with holes;
2) An electron conductive layer composed of a conductive agent and a binder;
3) An ion conductive layer composed of a solid electrolyte or a polymer electrolyte;
4) An intermediate layer having a double function of conducting electrons and conducting ions;
5) An intermediate layer with capacitance characteristic is composed of active carbon, conductive agent and binder.
2. The pole piece for the lithium ion battery according to claim 1, wherein the pole piece comprises a positive pole piece, and the active material in the conductive layer of the positive pole piece is selected from any one or a mixture of a plurality of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium manganese oxide and lithium manganese iron phosphate;
the punctiform or planar conductive material is selected from any one or a mixture of more of carbon black, flake graphite and graphene;
the linear conductive agent is selected from any one or two mixtures of carbon nano tube CNT and carbon fiber;
the binder is selected from any one or more of polytetrafluoroethylene PTFE, polyvinylidene fluoride PVDF, polyacrylic acid PAA and hydrogenated nitrile butadiene rubber HNBR.
3. The pole piece for the lithium ion battery according to claim 1, wherein the pole piece comprises a negative pole piece, and the active material in the conductive layer of the negative pole piece is selected from graphite, hard carbon, soft carbon, silicon and silicon oxide SiO x Lithiated SiO x -Li y SiO x Any one or more of graphite and silicon mixtures, metallic lithium, lithium titanate mixtures;
the punctiform or planar conductive material is carbon black;
the linear conductive agent is carbon nano tube or carbon fiber;
The binder is selected from any one or more of CMC, SBR, PTFE, PVDF, PAA, HNBR.
4. The electrode sheet for lithium ion battery according to claim 1, wherein the conductive layer further comprises an oxide solid electrolyte, the oxide solid electrolyte being contained in an amount of 0.1 to 15wt%, the oxide solid electrolyte being selected from the group consisting of LATP-Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 、LLZO-Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 Any one of them.
5. The pole piece for the lithium ion battery according to claim 1, wherein a plurality of through holes are formed in the pole piece, the through holes are distributed along the thickness direction of the pole piece and/or the thickness direction of the perpendicular pole piece, the diameter of each through hole is 0.01-100 um, and the distance between every two adjacent through holes is 0.02-0.5 mm.
6. The pole piece for a lithium ion battery according to claim 1, wherein the thickness of the membrane is 50-500 um, and the thickness of the transition layer is 5-25 um.
7. The pole piece for the lithium ion battery according to claim 1, wherein a metal lithium foil layer or a metal lithium sheet layer is arranged on one side of the pole piece, which faces an adjacent pole piece, the thickness of the metal lithium foil layer or the lithium sheet layer is 2-1000 um, and the metal lithium foil layer or the lithium sheet layer has the same shape and the same area as the pole piece.
8. The pole piece for lithium ion battery according to claim 7, wherein the metal lithium foil layer or the lithium sheet layer is provided with pores, the porosity is 1-80%, and the pore diameter is 0.05-2 mm.
9. A lithium ion battery, characterized by comprising a positive pole piece, a negative pole piece and a diaphragm, wherein the positive pole piece and/or the negative pole piece are/is the pole piece for the lithium ion battery according to any one of claims 1-8.
10. The lithium ion battery of claim 9, wherein the number of positive electrode tabs, negative electrode tabs, and separator is one.
11. The lithium ion battery of claim 10, wherein the separator has a thickness of 5-250 um, the positive electrode sheet has a thickness of 40-4000 um, and the negative electrode sheet has a thickness of 20-3000 um.
12. The lithium ion battery of claim 11, further comprising a button shell arranged outside the positive electrode pole piece and the negative electrode pole piece, wherein the negative electrode pole piece, the diaphragm and the positive electrode pole piece are sequentially arranged from the bottom of the button shell upwards, the diameter of the positive electrode pole piece is 5-20 mm, the diameter of the diaphragm is 6-22 mm, the diameter of the negative electrode pole piece is 5.6-21 mm, the diameter of the button shell is 6.1-22.1 mm, the thickness is 0.05-0.2 mm, the lithium ion battery further comprises an insulating sleeve arranged between the button shell and the positive electrode pole piece, and a top cover arranged above the positive electrode pole piece, and the diameter of the top cover is 5-21 mm, and the thickness is 0.05-0.2 mm.
13. The lithium ion battery of claim 11, wherein a metal sheet is arranged on one side of the positive electrode plate far away from the negative electrode plate and/or one side of the negative electrode plate far away from the positive electrode plate, the metal sheet is made of aluminum foil or copper foil, the thickness of the metal sheet is 5-25 um, and the diameter of the metal sheet is equal to that of the positive electrode plate or the negative electrode plate.
14. The lithium ion battery of claim 13, wherein one or both sides of the metal sheet are coated with a layer of conductive adhesive, the thickness of the conductive adhesive coating is 0.2-5 um, and the conductive adhesive is selected from polyacrylic acid and conductive carbon.
15. The lithium ion battery of claim 10, wherein a layer of conductive adhesive is coated on the surface of the positive electrode plate, which is close to the top cover, and the thickness of the conductive adhesive coating is 0.2-5 um, and the conductive adhesive is selected from polyacrylic acid and conductive carbon.
16. The lithium ion battery of claim 10, wherein the positive electrode plate is provided with a gradient distribution porosity structure along the thickness direction of the plate, and the porosity of the positive electrode plate on the side opposite to the negative electrode plate is higher than that of the positive electrode plate on the side far away from the negative electrode plate.
17. The lithium ion battery of claim 9, comprising two single-sided negative electrode sheets, a double-sided positive electrode sheet and two separators, wherein the single-sided negative electrode sheet, the separator layer, the double-sided positive electrode sheet, the separator layer, and the other single-sided negative electrode sheet are stacked in sequence.
18. The lithium ion battery of claim 9, comprising two single-sided positive electrode sheets, one double-sided negative electrode sheet and two diaphragms, wherein the single-sided positive electrode sheet, the diaphragm layer, the double-sided negative electrode sheet, the diaphragm layer and the other single-sided positive electrode sheet are stacked in sequence.
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