WO2022142256A1 - 一种锂离子电池 - Google Patents
一种锂离子电池 Download PDFInfo
- Publication number
- WO2022142256A1 WO2022142256A1 PCT/CN2021/105605 CN2021105605W WO2022142256A1 WO 2022142256 A1 WO2022142256 A1 WO 2022142256A1 CN 2021105605 W CN2021105605 W CN 2021105605W WO 2022142256 A1 WO2022142256 A1 WO 2022142256A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- positive electrode
- protective layer
- current collector
- electrode current
- ion battery
- Prior art date
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 159
- 239000011241 protective layer Substances 0.000 claims abstract description 270
- 239000010410 layer Substances 0.000 claims abstract description 192
- 238000009434 installation Methods 0.000 claims description 34
- 239000011888 foil Substances 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 28
- 239000011230 binding agent Substances 0.000 claims description 25
- 239000011256 inorganic filler Substances 0.000 claims description 22
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 22
- 239000000853 adhesive Substances 0.000 claims description 19
- 230000001070 adhesive effect Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 13
- 229910052744 lithium Inorganic materials 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 229910010293 ceramic material Inorganic materials 0.000 claims description 10
- 239000011149 active material Substances 0.000 claims description 9
- 239000006258 conductive agent Substances 0.000 claims description 8
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims description 8
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical group [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims description 8
- -1 nickel-cobalt-aluminum Chemical compound 0.000 claims description 8
- 229910000314 transition metal oxide Inorganic materials 0.000 claims description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 5
- 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 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 229910001593 boehmite Inorganic materials 0.000 claims description 3
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 3
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 claims description 2
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 29
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- 238000004519 manufacturing process Methods 0.000 description 26
- 238000001467 acupuncture Methods 0.000 description 25
- 239000002002 slurry Substances 0.000 description 19
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 239000002033 PVDF binder Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 238000009863 impact test Methods 0.000 description 11
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 11
- 230000001681 protective effect Effects 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 10
- 239000007773 negative electrode material Substances 0.000 description 10
- 238000002360 preparation method Methods 0.000 description 10
- 239000000843 powder Substances 0.000 description 9
- 239000002390 adhesive tape Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 239000006229 carbon black Substances 0.000 description 7
- 239000007774 positive electrode material Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000007756 gravure coating Methods 0.000 description 5
- 239000011253 protective coating Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 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 2
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
- 101000856234 Clostridium acetobutylicum (strain ATCC 824 / DSM 792 / JCM 1419 / LMG 5710 / VKM B-1787) Butyrate-acetoacetate CoA-transferase subunit A Proteins 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 229910021389 graphene Inorganic materials 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- 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
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- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
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- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
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- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
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- 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
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Definitions
- the present application relates to a lithium ion battery, which belongs to the technical field of secondary batteries.
- Lithium-ion batteries have the advantages of high energy density, high working voltage, light weight and small size. Long cycle life and green environmental protection are also necessary conditions for lithium-ion batteries to be widely used. Since the 1990s, lithium-ion batteries have been widely used in daily electronic products, electric vehicles and other energy storage power systems. However, due to the materials used in lithium-ion batteries and the particularity of the structure of lithium-ion batteries, there are still many safety hazards, especially when lithium-ion batteries are pierced by hard objects and hit by heavy objects, the safety of lithium-ion batteries exists. huge hidden danger. In recent years, the explosion and spontaneous combustion events of lithium-ion batteries reported by the media are endless, and people have higher and higher requirements for the safety performance of lithium-ion batteries. Safety has become one of the most important reasons for restricting the large-scale industrial application of lithium-ion batteries. one. How to improve the safety of lithium-ion batteries has become an urgent problem to be solved in the field of lithium-ion batteries at home and abroad.
- the positive electrode current collector is often double-coated in the prior art, that is, a layer of protective coating is first coated on the positive electrode current collector, and then the protective coating is applied on the positive electrode current collector. The surface of the layer away from the positive electrode current collector is then coated with a positive electrode active material layer to cover the protective coating.
- the protective coating can effectively protect the positive electrode current collector and prevent the positive electrode current collector from contacting the negative electrode active material during acupuncture.
- the protective effect of the protective coating in the prior art is limited, and there is still a risk of contact between the positive electrode current collector and the negative electrode active material.
- the positive electrode current collector often has low mechanical strength and weak adhesion to the separator. When the lithium-ion battery is impacted by a heavy object, it is prone to tearing, thereby causing the lithium-ion battery to fail.
- the application provides a lithium ion battery
- the lithium ion battery includes a positive electrode sheet, a negative electrode sheet and a separator, and by increasing the protection area of the protective layer on the surface of the positive electrode current collector, it helps to reduce the amount of the positive electrode current collector and the negative electrode active material during acupuncture.
- Contact risk and improve the mechanical strength of the positive electrode current collector, prevent the positive electrode current collector from tearing during the impact of heavy objects, reduce the safety risk of lithium-ion batteries in the process of needle punching and impact with heavy objects, and improve the safety of lithium-ion batteries performance.
- the application provides a lithium ion battery
- the lithium ion battery includes a positive electrode sheet, a negative electrode sheet, and a separator, and the positive electrode sheet, the separator, and the negative electrode sheet are stacked in sequence and then wound from the inside to the outside to form;
- the positive electrode sheet includes a positive electrode current collector, at least one functional surface of the positive electrode current collector is provided with a protective layer, and a positive electrode active layer is provided on the surface of the protective layer away from the positive electrode current collector; In the winding direction, the length of the protective layer is greater than the length of the positive electrode active layer.
- At least one functional surface of the positive electrode current collector includes an active layer region, and further includes a first end region and/or a second end region;
- the protective layer includes a conductive protective layer, the conductive protective layer is arranged in the first end region and/or the second end region, the active layer region, and the conductive protective layer arranged in the active layer region is far from the positive electrode
- the surface of the current collector is provided with the positive electrode active layer.
- the protective layer further includes an insulating protective layer, and the insulating protective layer is disposed on the surface of the conductive protective layer of the first end region and/or the second end region away from the positive electrode current collector .
- the protective layer includes an inorganic filler, and the D 50 of the inorganic filler is smaller than the D 50 of the active material in the positive electrode active layer.
- the inorganic filler includes a lithium-containing transition metal oxide and/or a ceramic material.
- the lithium-containing transition metal oxide is selected from lithium cobalt oxide, nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material, nickel-cobalt-manganese-aluminum quaternary material, lithium iron phosphate, lithium manganese phosphate, One or more of lithium vanadium phosphate, lithium manganate, and lithium-rich manganese base;
- the ceramic material is selected from one or more of alumina, boehmite, zirconia, titania, silica, montmorillonite, magnesia, and magnesium hydroxide.
- the adhesive force between the protective layer and the positive electrode current collector is greater than the adhesive force between the protective layer and the positive electrode active layer
- the binding force between the protective layer and the positive electrode current collector is greater than the binding force between the active material particles in the positive electrode active layer.
- the mass fraction of the binder in the protective layer is greater than the mass fraction of the binder in the positive active layer.
- the total mass of the protective layer remaining on the positive electrode current collector accounts for more than 10% of the total mass of the protective layer on the positive electrode current collector before peeling.
- the total area of the protective layer remaining on the positive electrode current collector accounts for more than 70% of the total area of the protective layer on the positive electrode current collector before peeling.
- the conductive protective layer includes 50%-98% of inorganic filler, 0.5%-10% of the first conductive agent and 1.5%-50% of the first binder according to the mass percentage content.
- the insulating protective layer comprises 50%-96% of the ceramic material and 4%-50% of the second binder according to the mass percentage.
- the thickness of the protective layer is 1%-50% of the thickness of the positive electrode active layer.
- the thickness of the conductive protective layer disposed in the first end region is 1-25 ⁇ m
- the thickness of the conductive protective layer disposed in the second end region is 1-25 ⁇ m
- the thickness of the conductive protective layer disposed in the second end region is 1-25 ⁇ m.
- the thickness of the conductive protective layer in the active layer region is 1-10 ⁇ m.
- the thickness of the conductive protective layer provided in the first end region and/or the second end region and in the active layer region is the same.
- the thickness of the insulating protective layer on the surface of the conductive protective layer disposed in the first end region away from the positive electrode current collector is 1-15 ⁇ m; the conductive protective layer disposed in the second end region has a thickness of 1-15 ⁇ m; The thickness of the insulating protective layer on the surface away from the positive electrode current collector is 1-15 ⁇ m.
- At least one functional surface of the positive electrode current collector further includes an installation area exposing the positive electrode current collector, and the installation area communicates with one side surface of the positive electrode current collector.
- the positive electrode sheet further includes a positive electrode lug, and the positive electrode lug is arranged in an installation area of a functional surface of the positive electrode current collector, and the installation area is close to the winding center and away from the winding center. Both sides are provided with the protective layer.
- the first end region includes a first flat region, an installation region, a second flat region, a third flat region and a first arc region along the winding direction of the positive electrode current collector;
- the installation area is provided with a positive electrode tab, the surface of the positive electrode sheet is pasted with a first adhesive paper, and the first adhesive paper and the surface of the protective layer arranged in the third flat area are arranged on the first circle.
- the surface of the protective layer in the arc region and at least part of the surface of the positive electrode active layer disposed in the active layer region are bonded.
- the second end region includes a second arc region and a fourth straight region along the winding direction of the positive electrode current collector, the surface of the positive electrode sheet is affixed with a second adhesive tape, and the The second adhesive paper and at least part of the surface of the positive active layer disposed in the active layer region, the surface of the protective layer disposed in the second arc region, and at least part of the protective layer disposed in the fourth straight region Surface bonding.
- At least one functional surface of the positive electrode current collector includes an empty foil region, the empty foil region is located at the end of the second end region away from the winding center, and the surface of the empty foil region is not
- the protective layer is provided.
- neither of the two functional surfaces of the end of the positive electrode current collector away from the winding center includes an empty foil region.
- the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed on at least one functional surface of the negative electrode current collector, and the length of the negative electrode active layer is greater than the length of the positive electrode active layer.
- At least one functional surface of the negative electrode current collector includes an empty foil area, the empty foil area is located at the end of the negative electrode current collector away from the winding center, and the surface of the empty foil area is not provided with any the negative electrode active layer.
- both functional surfaces of the end of the negative electrode current collector away from the winding center do not include empty foil regions.
- the lithium ion battery provided by the present application includes a positive electrode sheet, a negative electrode sheet and a separator that are wound and formed after being stacked in sequence, wherein a protective layer is provided on the surface of the positive electrode sheet, and the length of the protective layer is greater than that of the positive electrode active layer.
- the large area of the protective layer arranged on the positive electrode current collector can reduce the risk of short circuit caused by contact between the negative electrode active material and the positive electrode current collector when acupuncture occurs, and improve the safety performance of the positive electrode sheet when acupuncture occurs; on the other hand, increasing the The area of the protective layer arranged on the functional surface of the positive electrode current collector can further enhance the mechanical strength of the positive electrode current collector, prevent the positive electrode current collector from tearing when the positive electrode sheet is impacted by heavy objects, improve the life of the positive electrode current collector, and reduce the impact of heavy objects on the positive electrode sheet Therefore, the lithium-ion battery including the above-mentioned positive electrode plate has more excellent safety performance, and better meets the current requirements for the safety performance of lithium-ion batteries.
- the preparation process of the lithium-ion battery of the present application is simple and easy to implement, without the assistance of large-scale instruments, and can be compatible with the existing production process, so as to achieve a significant improvement in the safety of the lithium-ion battery during acupuncture and heavy object impact at a lower cost. Therefore, it is also convenient for large-scale promotion in industrial applications.
- the present application provides a protective layer on the surface of the current collector, which can increase the adhesion between the positive electrode current collector and the diaphragm, improve the infiltration ability of the electrolyte to the positive electrode sheet, and improve the charge and discharge performance of the positive electrode sheet.
- the applied lithium-ion battery has more excellent charge-discharge characteristics due to the positive electrode sheet with more excellent charge-discharge performance, and better meets today's requirements for comprehensive performance of lithium-ion batteries.
- Embodiment 1 is a schematic structural diagram of Embodiment 1 of a lithium-ion battery of the present application
- Embodiment 1 of the positive electrode current collector of the present application is a schematic structural diagram of Embodiment 1 of the positive electrode current collector of the present application;
- Embodiment 2 is a schematic structural diagram of Embodiment 2 of the positive electrode current collector of the present application.
- Embodiment 3 is a schematic structural diagram of Embodiment 3 of the positive electrode current collector of the present application.
- Embodiment 1 of the positive electrode sheet of the present application is a schematic structural diagram of Embodiment 1 of the positive electrode sheet of the present application.
- Embodiment 2 is a schematic structural diagram of Embodiment 2 of the positive electrode sheet of the present application.
- FIG. 7 is a schematic structural diagram of Embodiment 3 of the positive electrode sheet of the present application.
- FIG. 8 is a schematic structural diagram of Embodiment 4 of the positive electrode sheet of the present application.
- Embodiment 5 of the positive electrode sheet of the present application is a schematic structural diagram of Embodiment 5 of the positive electrode sheet of the present application.
- FIG. 10 is a schematic structural diagram of Embodiment 6 of the positive electrode sheet of the present application.
- FIG. 11 is a schematic structural diagram of the seventh embodiment of the positive electrode sheet of the present application.
- Embodiment 4 is a schematic structural diagram of Embodiment 4 of the positive electrode current collector of the present application.
- FIG. 13 is a schematic structural diagram of Embodiment 8 of the positive electrode sheet of the present application.
- FIG. 14 is a schematic structural diagram of the ninth embodiment of the positive electrode sheet of the present application.
- FIG. 15 is a schematic structural diagram of the tenth embodiment of the positive electrode sheet of the present application.
- Embodiment 11 of the positive electrode sheet of the present application is a schematic structural diagram of Embodiment 11 of the positive electrode sheet of the present application.
- Embodiment 17 is a schematic structural diagram of Embodiment 2 of the lithium-ion battery of the present application.
- FIG. 18 is a schematic structural diagram of Embodiment 3 of the lithium ion battery of the present application.
- Insulation protection layer 202. Insulation protection layer
- the application provides a lithium ion battery
- the lithium ion battery includes a positive electrode sheet, a negative electrode sheet, and a separator, and the positive electrode sheet, the separator, and the negative electrode sheet are stacked in sequence and then wound from the inside to the outside to form;
- the positive electrode sheet includes a positive electrode current collector, at least one functional surface of the positive electrode current collector is provided with a protective layer, and a positive electrode active layer is provided on the surface of the protective layer away from the positive electrode current collector; In the winding direction of the fluid, the length of the protective layer is greater than the length of the positive electrode active layer.
- FIG. 1 is a schematic structural diagram of Embodiment 1 of the lithium ion battery of the present application.
- the lithium ion battery includes a positive electrode sheet, a separator (not shown in the figure) and a negative electrode sheet, and the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence
- the separator is located between the positive electrode and the negative electrode, which acts to isolate the contact between the positive electrode and the negative electrode, and prevent the short circuit of the lithium ion battery.
- the stacked positive electrode, separator and negative electrode are wound from one end along the length direction , according to the design of the lithium ion battery, the lithium ion battery can be obtained after winding and forming, wherein the positive electrode sheet includes a positive electrode current collector 100, a protective layer 200 and a positive electrode active layer 300.
- the positive electrode current collector The functional surface of the current collector refers to a plane composed of the length and width of the current collector, and specifically refers to the upper surface and the lower surface of the positive electrode current collector, which is used to support the positive electrode active layer. At least one functional surface of the positive electrode current collector 100 is provided with a protective layer 200.
- the surface of the protective layer 200 away from the positive electrode current collector 100 is provided with a positive electrode active layer 300, and the length of the protective layer 200 is greater than the length of the positive electrode active layer 300, that is, the protection area of the protective layer 200 on the surface of the positive electrode current collector 100 is increased.
- Increasing the area of the protective layer disposed on the positive electrode current collector can reduce the risk of short circuit due to contact between the negative electrode active material and the positive electrode current collector when acupuncture occurs, and improve the safety performance of the lithium-ion battery when acupuncture occurs; on the other hand, Increasing the area of the protective layer arranged on the functional surface of the positive electrode current collector can further enhance the mechanical strength of the positive electrode current collector, prevent the positive electrode current collector from tearing when the positive electrode sheet is impacted by heavy objects, improve the life of the positive electrode current collector, and reduce the weight of the positive electrode sheet.
- the risk of failure of the positive electrode sheet and potential safety hazard when the object is impacted can improve the safety performance of the lithium ion battery when it is impacted by a heavy object; in conclusion, the lithium ion battery provided by the present application has better safety performance.
- At least one functional surface of the positive electrode current collector includes an active layer region, and further includes a first end region and/or a second end region, that is, at least one functional surface of the positive electrode current collector including a first end region and an active layer region, or, at least one functional surface of the positive electrode current collector includes an active layer region and a second end region, or, alternatively, at least one functional surface of the positive electrode current collector includes a first An end region, an active layer region and a second end region, the first end region and the second end region are respectively located on both sides of the active layer region, namely the first end region, the active layer region and the second end region.
- the two end regions are arranged in sequence along the winding direction of the positive electrode current collector; for example, FIG.
- the positive electrode current collector 100 has two functional surfaces, namely The first functional surface a-1 and the second functional surface a-2, and the first functional surface a-1 and the second functional surface a-2 respectively include a first end region a-3, an active layer along the winding direction in turn
- the region a-4 that is, the positive electrode current collector 100 may include the two above-mentioned first end regions a-3, which are respectively located on the first functional surface a-1 of the positive electrode current collector 100 and the second functional surface a of the positive electrode current collector 100 -2, two active layer regions a-4, respectively located on the first functional surface a-1 of the positive electrode current collector 100 and the second functional surface a-2 of the positive electrode current collector 100;
- FIG. 1 The first functional surface a-1 and the second functional surface a-2
- the first functional surface a-1 and the second functional surface a-2 respectively include a first end region a-3, an active layer along the winding direction in turn
- the region a-4 that is, the positive electrode current collector 100 may include the two
- FIG. 3 is an embodiment of the positive electrode current collector of the present application 2 is a schematic diagram of the structure, as shown in FIG. 3 , the first functional surface a-1 and the second functional surface a-2 of the positive electrode current collector 100 sequentially include an active layer region a-4 and a second end region along the winding direction, respectively. a-5;
- FIG. 4 is a schematic structural diagram of Embodiment 3 of the positive electrode current collector of the present application. As shown in FIG. 4 , the first functional surface a-1 and the second functional surface a-2 of the positive electrode current collector 100 are respectively along the winding direction.
- first end region a-3 the active layer region a-4 and the second end region a-5 in sequence; it can be understood that the regions included in the first functional surface a-1 and the second functional surface a-2 may be the same or different, for example, the first functional surface a-1 may include a first end region a-3, an active layer region a-4 and a second end region a-5, and the second functional surface a-2 may include The first end region a-3 and the active layer region a-4 are specifically set according to actual production conditions.
- the present application does not strictly limit the material of the positive electrode current collector 100 , for example, the material of the positive electrode current collector 100 may be aluminum foil.
- the active layer area a-4 in this application refers to the area where the positive electrode active layer is arranged on the functional surface of the positive electrode current collector.
- the positive electrode active layer contains active materials, and the active materials generate current during the charging and discharging process and output it externally.
- the first end region a-3 and the second end region a-5 are located on both sides of the active layer region a-4 respectively, and are regions on the functional surface of the positive electrode current collector 100 where the positive electrode active layer 300 is not supported.
- the protective layer includes a conductive protective layer, the conductive protective layer is arranged in the first end region and/or the second end region, the active layer region, and the conductive protective layer arranged in the active layer region is far from the positive electrode
- the surface of the current collector is provided with the positive electrode active layer.
- FIG. 5 is a schematic structural diagram of the first embodiment of the positive electrode sheet of the present application.
- a functional surface of the positive electrode current collector includes a first end region a-3, an active layer region a-4 and a second end region along the winding direction.
- the end region a-5, the first end region a-3 and the active layer region a-4 are provided with a conductive protective layer 201;
- FIG. 6 is a schematic structural diagram of the second embodiment of the positive electrode sheet of the present application, as shown in FIG.
- the positive electrode One functional surface of the current collector includes a first end region a-3, an active layer region a-4 and a second end region a-5 along the winding direction, the active layer region a-4 and the second end region a- 5 is provided with a conductive protective layer 201;
- FIG. 7 is a schematic structural diagram of the third embodiment of the positive electrode sheet of the present application.
- a functional surface of the positive electrode current collector includes a first end region a-3, an active The layer region a-4 and the second end region a-5, the first end region a-3, the active layer region a-4 and the second end region a-5 are provided with a conductive protective layer 201, in addition, FIG. 5 - FIG.
- the conductive protective layer 201 of the positive active layer is arranged in the active layer region away from the surface of the positive current collector 100, and is arranged on the first The surface of the conductive protective layer 201 in the end region and the second end region is not provided with the positive electrode active layer 300 .
- the other functional surface is not affected. Strictly limited, for example, the other functional surface may not be provided with any protective layer, or a conductive protective layer may be provided on the first end region and/or the second end region and the active layer region of the other functional surface.
- the present application also includes the two A conductive protective layer 201 is provided on each functional surface.
- FIG. 8 is a schematic structural diagram of Embodiment 4 of the positive electrode sheet of the present application.
- conductive protective layers are provided on the two functional surfaces of the positive electrode current collector 100 .
- in the two first end regions a-3 and the two active layer regions a of the first functional surface a-1 and the second functional surface a-2 of the positive electrode current collector 100 -4 and the two second end regions a-5 are provided with two conductive protective layers 201, and the positive active layer 300 is provided on the surface of the conductive protective layer 201 disposed in the active layer region away from the positive electrode current collector 100, that is, the positive electrode
- the regions of the two functional surfaces of the current collector 100 where the positive electrode active layer is not provided are both provided with a protective layer, and the protective layer can protect the positive electrode current collector to the greatest extent.
- the length of the first end region a-3 located on the first functional surface a-1 and the length of the first end region a-3 located on the second functional surface a-2 may be The same or different; the length of the active layer region a-4 located on the first functional surface a-1 and the length of the active layer region a-4 located on the second functional surface a-2 can be the same or different; the length of the active layer region a-4 located on the first functional surface a-2 The length of the second end region a-5 of the surface a-1 and the length of the second end region a-5 of the second functional surface a-2 can be the same or different.
- the lengths of the first end region a-3, the active layer region a-4, and the second end region a-5 of the different functional surfaces of the positive electrode current collector 100 can be designed according to the design requirements of the positive electrode sheet Considering.
- the setting of the protective layer for the first end region a-3, the active layer region a-4, and the second end region a-5 of one or two functional surfaces of the positive electrode current collector 100 can be based on the safety requirements of the positive electrode sheet, The structure of the positive electrode sheet and the production cost of the positive electrode sheet are comprehensively considered.
- the conductive protective layer 201 in addition to disposing the conductive protective layer 201 in the active layer region a-4 of the positive electrode current collector of the positive electrode sheet, the first end region a-3 and the second end region a of the positive electrode current collector 100 in the positive electrode sheet -5
- the conductive protective layer 201 is provided, which further strengthens the protection of the protective layer to the positive electrode current collector, improves the mechanical strength of the positive electrode current collector in the non-active layer area, reduces the risk of contact between the positive electrode current collector and the negative electrode active material during the acupuncture process, and prevents the positive electrode current collector.
- the current collector is torn during the impact of heavy objects, which reduces the safety risk of the positive electrode sheet during the acupuncture process and the impact of heavy objects, and improves the safety performance of lithium-ion batteries during the process of acupuncture and impact with heavy objects.
- the present application does not strictly limit the method of forming the conductive protective layer 201 on the functional surface of the positive electrode current collector.
- one or more methods of double-layer coating, gravure coating, and transfer coating can be used.
- a conductive protective layer 201 is formed on the functional surface of the positive electrode current collector 100 .
- the conductive protective layer needs to have the ability to conduct electricity, and it must include conductive materials, such as conductive agents.
- An insulating protective layer is provided on the surface of the conductive protective layer away from the positive electrode current collector, and the insulating protective layer does not include a conductive agent.
- the protective layer further includes an insulating protective layer, and the insulating protective layer is disposed in the first end region. And/or the conductive protective layer of the second end region is away from the surface of the positive current collector.
- FIG. 9 is a schematic structural diagram of Embodiment 5 of the positive electrode sheet of the present application.
- the positive electrode sheet includes a positive electrode current collector 100 , a first end region disposed on the first functional surface a-1 of the positive electrode current collector, and an active layer region.
- the conductive protective layer 201 in the second end region, the conductive protective layer 201 disposed in the first end region and the second end region away from the insulating protective layer 202 on the surface of the positive electrode current collector 100, the conductive protective layer 201 disposed in the active layer region
- the layer 201 is far from the positive electrode active layer 300 on the surface of the positive electrode current collector 100 , and the setting method of the surface of the second functional surface a-2 of the positive electrode current collector 100 is the same.
- FIG. 10 is a schematic structural diagram of the sixth embodiment of the positive electrode sheet of the present application.
- the positive electrode sheet includes a positive electrode current collector 100 , a first end region disposed on the first functional surface a-1 of the positive electrode current collector, and an active layer region. and the conductive protective layer 201 in the second end region, the conductive protective layer 201 in the first end region is far away from the insulating protective layer 202 on the surface of the positive electrode current collector 100, and the conductive protective layer 201 in the active layer region is far away from the positive electrode current collector
- the arrangement of the positive electrode active layer 300 on the surface of the positive electrode current collector 100 and the surface of the second functional surface a-2 of the positive electrode current collector 100 is the same as that.
- FIG. 11 is a schematic structural diagram of the seventh embodiment of the positive electrode sheet of the present application.
- the positive electrode sheet includes a positive electrode current collector 100 , a first end region disposed on the first functional surface a-1 of the positive electrode current collector, and an active layer region. and the conductive protective layer 201 in the second end region, the conductive protective layer 201 disposed in the first end region and the second end region away from the insulating protective layer 202 on the surface of the positive electrode current collector 100, the conductive protective layer 201 disposed in the active layer region The layer 201 is far away from the positive electrode active layer 300 on the surface of the positive electrode current collector 100.
- the first end region, the active layer region and the second end region of the second functional surface a-2 of the positive electrode current collector 100 are provided with a conductive protective layer 201.
- a positive electrode active layer 300 is provided on the surface of the conductive protective layer 201 in the active layer region away from the positive electrode current collector 100 , and no insulating protective layer is provided on the surface of the conductive protective layer provided in the first end region and the second end region.
- This application does not limit the arrangement of the functional surface protective layer of the positive electrode current collector 100.
- comprehensive consideration can be made according to the safety requirements of the positive electrode sheet, the structure of the positive electrode sheet, and the production cost of the positive electrode sheet.
- the present application does not strictly limit the formation method of the positive electrode active layer 300 on the conductive protective layer 201 disposed in the active layer region. -4 After the formation, the positive electrode active layer 300 is provided on the surface of the conductive protection layer 201 away from the positive electrode current collector 100 by coating.
- the main component of the protective layer is an inorganic filler, and the inorganic filler is a lithium-containing transition metal oxide and/or a ceramic material.
- the lithium-containing transition metal oxide is selected from lithium cobalt oxide, nickel-cobalt-manganese ternary material, nickel-cobalt-aluminum ternary material, nickel-cobalt-manganese-aluminum quaternary material, lithium iron phosphate, phosphoric acid
- lithium cobalt oxide nickel-cobalt-manganese ternary material
- nickel-cobalt-aluminum ternary material nickel-cobalt-manganese-aluminum quaternary material
- lithium iron phosphate lithium iron phosphate
- phosphoric acid lithium iron phosphate
- lithium iron phosphate lithium iron phosphate
- the ceramic material is selected from one or more of alumina, boehmite, zirconia, titania, silica, montmorillonite, magnesia, and magnesium hydroxide.
- the protective layer includes the ceramic material alumina, its safety performance is better than that including the lithium-containing transition metal oxide, and when the lithium-containing transition metal oxide is included
- the oxide is lithium iron phosphate, its safety performance is better than that of nickel-cobalt-manganese ternary material.
- the inventors of the present application also found that the median particle size D 50 of the inorganic filler also has a certain influence on the safety performance of the lithium ion battery, and a smaller D 50 is beneficial to improve the safety of the lithium ion battery. Therefore, the D 50 of the inorganic filler should be less than D 50 of the active material in the positive electrode active layer.
- the D 50 of the inorganic filler is 0.1-6 ⁇ m, and the D 50 of the positive electrode active material is 10-30 ⁇ m.
- the inventors of the present application have further studied and found that when the adhesive force between the protective layer and the positive electrode current collector is greater than the adhesive force between the protective layer and the positive electrode active layer, and/or when the protective layer and the positive electrode current collector are between the above-mentioned protective layer
- the bonding force of the positive electrode is greater than the bonding force between the active material particles in the positive electrode active layer
- the surface of the positive electrode current collector is well protected by the protective layer in the case of mechanical abuse (such as acupuncture, heavy object impact). It is not easy to be exposed, so that the contact probability between the positive electrode current collector and the negative electrode sheet is reduced, thereby reducing the short circuit probability between the positive electrode current collector and the negative electrode sheet, and improving the safety of the battery.
- the adhesive force between the protective layer and the positive electrode current collector is greater than 30 N/m.
- the adhesion between the protective layer and the positive electrode current collector is 35-300 N/m.
- the adhesive force between the protective layer and the positive electrode current collector is 35-200 N/m.
- the bonding force between the protective layer and the positive electrode active layer and between the active material particles in the positive electrode active layer is mainly provided by the binder. Therefore, in order to improve the bonding force between the protective layer and the positive electrode current collector, The content of the binder in the protective layer can be increased, that is, the mass fraction of the binder in the protective layer is greater than the mass fraction of the binder in the positive active layer.
- the present application also provides a method for detecting the adhesive force.
- the protective layer on the positive electrode sheet is peeled off. After that, the total mass of the protective layer remaining on the positive electrode current collector accounts for more than 10% of the total mass of the protective layer on the positive electrode current collector before peeling.
- the total area of the positive electrode coating remaining on the positive electrode current collector accounts for more than 70% of the total area of the protective layer on the positive electrode current collector before peeling.
- the protective layer here includes a conductive protective layer and an insulating protective layer, that is, all protective layers disposed on the functional surface of the positive electrode current collector 100 .
- the components of the protective layer have a great impact on the safety of lithium-ion batteries.
- the present application also limits the content of each component in the protective layer.
- the The conductive protective layer includes 50%-98% of inorganic filler, 0.5%-10% of the first conductive agent and 1.5%-50% of the first binder according to the mass percentage; the insulating protective layer is according to the mass%
- the content includes 50%-96% of the ceramic material and 4%-50% of the second binder;
- the positive electrode active layer includes 93%-99% of the positive electrode active material, 0.5%-5% of the positive electrode active material according to the mass percentage
- the second conductive agent and 0.5%-2% of the third binder it can be understood that the first, second and third defined in this application are mainly used to distinguish the addition positions of the conductive agent and the binder, so
- the materials used may be the same or different, for example, the first binder, the second binder and the third binder may all be polyvinylidene fluoride, and the difference
- Positive active materials include lithium cobalt oxide (LCO), nickel-cobalt-manganese ternary material (NCM), nickel-cobalt-aluminum ternary material (NCA), nickel-cobalt-manganese-aluminum quaternary material (NCMA), lithium iron phosphate (LFP), phosphoric acid
- NCM nickel-cobalt-manganese ternary material
- NCA nickel-cobalt-aluminum ternary material
- NCMA nickel-cobalt-manganese-aluminum quaternary material
- LFP lithium iron phosphate
- conductive agents include one or more of conductive carbon black, carbon nanotubes, and graphene; bonding
- the agent includes one or both of polyvinylidene fluoride and modified polyvinylidene fluoride.
- the thickness of the protective layer 200 has a certain influence on the performance of the positive electrode sheet. Too thick protective layer is not conducive to the energy density of the lithium ion battery. Usually, the thickness of the protective layer is 1% of the thickness of the positive electrode active layer. -50%.
- the thickness of the conductive protective layer disposed in the first end region is 1-25 ⁇ m
- the thickness of the conductive protective layer disposed in the second end region is 1-25 ⁇ m
- the thickness of the conductive protective layer disposed in the second end region is 1-25 ⁇ m.
- the thickness of the conductive protective layer in the active layer region is 1-10 ⁇ m, which can protect the positive electrode sheet by the protective layer and reduce the influence of the setting of the protective layer on the overall performance of the positive electrode sheet.
- the thicknesses of the conductive protection layers disposed in the first end region and/or the second end region and in the active layer region are the same, that is, those skilled in the art can obtain conductive protection after preparation On the basis of the layer slurry, it is coated on at least one functional surface of the positive electrode current collector to obtain a conductive protective layer.
- the thickness of the insulating protective layer on the surface of the conductive protective layer disposed in the first end region away from the positive electrode current collector is 1-15 ⁇ m; the thickness of the insulating protective layer disposed in the second end region The thickness of the insulating protective layer on the surface of the conductive protective layer away from the positive electrode current collector is 1-15 ⁇ m.
- the thickness of the positive electrode active layer 300 is 50-100 ⁇ m.
- the present application does not strictly limit the thicknesses of the conductive protective layer 201 and the insulating protective layer 202 provided in different regions, and those skilled in the art can select appropriate thicknesses according to actual production needs or pole piece preparation needs.
- the thicknesses L1 and L2 of the conductive protective layers 201 distributed on the two first end regions of the two functional surfaces of the positive electrode current collector 100 may be equal or unequal, and the thicknesses L1 and L2 of the conductive protective layers 201 distributed in the two functional surfaces of the positive electrode current collector 100
- the thicknesses L3 and L4 of the conductive protective layers 201 in the two active layer regions on the surface can be equal or unequal, and the thickness L5 of the conductive protective layers 201 distributed in the two second end regions of the two functional surfaces of the positive electrode current collector 100 and L6 may be equal or unequal, and the conductive protective layers L1, L3, L5 distributed in the first end region and/or the second end region of a functional surface of the positive electrode current collector 100 and
- At least one functional surface of the positive electrode current collector further includes an installation area exposing the positive electrode current collector, and the installation area communicates with one side surface of the positive electrode current collector.
- FIG. 12 is a schematic structural diagram of the fourth embodiment of the positive electrode current collector of the present application.
- at least one functional surface of the positive electrode current collector 100 further includes an installation area a-6, and the installation area a-6 is arranged in the first end region In a-3, the installation area a-6 is in communication with the side of the positive electrode current collector 100, and the side surface of the positive electrode current collector refers to the four sides with smaller area of the positive electrode current collector, specifically the plane composed of the length/width and height of the current collector.
- connection between the installation area a-6 and one side of the positive electrode current collector 100 can facilitate the arrangement of the positive electrode tab 400 on the positive electrode current collector 100, that is, the positive electrode sheet also includes a positive electrode tab, and the positive electrode tab is arranged on one of the positive electrode current collectors.
- the installation area of the functional surface, and the protective layer is provided on both the side of the installation area close to the winding center and the side away from the winding center.
- FIG. 13 is a schematic structural diagram of the eighth embodiment of the positive electrode sheet of the present application.
- the positive electrode sheet includes a positive electrode tab 400 .
- the first end region a-3 that is, the head region close to the positive electrode sheet.
- installation area a-6 can also be set in the active layer area a-4, and those skilled in the art can set the position of the installation area according to the different positions of the tabs.
- the shape of the installation area a-6 is not strictly limited in the present application, and in a specific implementation manner, the size and shape of the installation area a-6 can be preset according to the tab 400 .
- the positive electrode tab 400 adopts a sheet-type tab commonly used in the art, and the shape of the mounting area a-6 may be a rectangle.
- the positive electrode tab 400 may be an aluminum tab commonly used in the art.
- the present application does not strictly limit the manner in which the positive electrode tabs 400 are disposed in the installation area a-6.
- the positive electrode tabs 400 may be disposed on the installation area a-6 by welding.
- Fig. 14 is a schematic structural diagram of the ninth embodiment of the positive electrode sheet of the application, as shown in Fig. 14, from the positive electrode current collector close to One side of the winding center begins to divide the first end area a-3 into a first flat area a-3-1, an installation area a-6, a second flat area a-3-2, and a third flat area a-3-2.
- Area a-3-3 and the first arc area a-3-4, the first arc area a-3-4 and the active layer area a-4 are connected end to end, the above-mentioned areas are divided according to the position of the adhesive tape and the positive electrode
- the winding method of the sheet is divided. In order to facilitate the bonding between the first adhesive tape and the protective layer, there should be a certain distance between the adhesive tape 900 and the positive electrode tab 400, and cover the position of the positive electrode sheet winding arc until it is active with the positive electrode.
- Layer bonding that is, the first adhesive paper 900 and the surface of the protective layer arranged in the third straight area a-3-3 and the protective layer arranged in the first arc area a-3-4 and at least part of the surface of the positive electrode active layer 300 disposed in the active layer region.
- the surface of the positive electrode sheet away from the winding center is also pasted with a second adhesive tape 1000.
- the second end area is divided into a second circular arc area and a fourth straight area, as shown in FIG. 15 .
- the second end regions of the two functional surfaces of the positive electrode current collector 100 are divided into second arc regions a-5- along the winding direction of the positive electrode current collector 1 and the fourth straight area a-5-2, the second arc area a-5-1 is connected to the active layer area 2-4, the second arc area a-5-1 and the fourth straight area a- 5-2
- the second tape 100 should be bonded to part of the surface of the positive active layer, and Cover the position of the positive electrode sheet winding arc, that is, the second tape 1000 and at least part of the surface of the positive electrode active layer 300 disposed in the active layer area a-4, and disposed in the second arc area a-
- the surface of the protective layer of 5-1 and at least part of the surface of the protective layer disposed in the fourth flat area a-5-2 are bonded.
- the protective layer shown in FIGS. 14-15 is the conductive protective layer 201.
- the conductive protective layer 201 is provided with an insulating protective layer on the surface of the conductive protective layer 201 away from the positive electrode current collector 101, the first tape and the second tape are connected to the insulating layer. The surface of the protective layer is bonded.
- At least one functional surface includes an empty foil area, the empty foil area is located at the end of the second end region away from the winding center, and the protective layer is not provided on the surface of the empty foil area, that is, at least part of the positive electrode collector
- the fluid 100 is exposed to facilitate bonding with the casing and improve the bonding strength.
- FIG. 16 is a schematic structural diagram of the eleventh embodiment of the positive electrode sheet of the present application.
- the positive electrode current collector 100 sequentially includes a first end region, an active layer region, a second end region and an empty foil region along the winding direction.
- the first end region, the active layer region and the second end region are provided with a conductive protective layer 201, and a positive electrode active layer is provided on the surface of the conductive protective layer 201 disposed in the active layer region away from the positive electrode current collector 100 300, the first end region includes an installation area, the installation area is provided with a positive electrode tab 400, the surface of the empty foil area is not provided with a protective layer and a positive electrode active layer, and the positive electrode current collector 100 is exposed.
- the two functional surfaces of the end of the positive electrode current collector away from the winding center may not include empty foil regions, that is, the two functional surfaces of the positive electrode current collector 100 include the first end region, Active layer area, second end area, excluding empty foil area.
- the lithium ion battery further includes a separator 800, which is arranged between the positive electrode sheet and the negative electrode sheet to isolate the positive electrode sheet and the negative electrode sheet.
- the lithium ion battery also includes a negative electrode sheet, the negative electrode sheet includes a negative electrode current collector and a negative electrode active layer arranged on at least one functional surface of the negative electrode current collector. the length of the positive active layer.
- the preparation process of the negative electrode sheet includes: preparing the negative electrode active layer slurry, and coating it on at least one functional surface of the positive electrode current collector to obtain the negative electrode active layer, and then obtain the negative electrode sheet.
- the negative electrode active layer slurry is tailed, which simplifies the preparation process of the negative electrode sheet.
- At least one functional surface of the negative electrode current collector includes an empty foil area, and the empty foil area is located at the end of the negative electrode current collector away from the winding center, The negative electrode active layer is not provided on the surface of the empty foil area, that is, the negative electrode current collector at the end of the winding center is exposed.
- the length of the negative electrode active slurry coating can be controlled to be smaller than the length of the negative electrode current collector. , which is beneficial to the full loading of the negative electrode current collector to the negative electrode active slurry.
- the two functional surfaces of the end of the negative electrode current collector away from the winding center do not include empty foil areas.
- FIG. 17 is a schematic structural diagram of the second embodiment of the lithium ion battery of the present application. As shown in FIG.
- a positive electrode sheet, a separator 800 and a negative electrode sheet formed by winding wherein the positive electrode sheet includes a positive electrode current collector 100, a conductive protective layer 201 arranged on the two functional surfaces of the positive electrode current collector, and the conductive protective layer 201 provided in the active layer area is far away from the positive electrode
- the surface of the current collector 100 is provided with a positive electrode active layer 300, the first end region includes an installation area, the positive electrode tab 400 is arranged in the installation area to connect with the positive electrode current collector, the side of the positive electrode sheet close to the winding center and the side away from the winding center.
- FIG. 18 is the lithium ion battery of the application
- the structure of the negative electrode sheet is basically the same, that is, the negative electrode sheet includes a negative electrode current collector 500 and a negative electrode active layer 600, the negative electrode current collector 500 is provided with a negative electrode ear 700 on the side close to the winding center, and the length of the negative electrode active layer 600 is greater than that of the positive electrode active layer.
- the length of the layer 300, and the end of the negative current collector 500 away from the center of the winding includes an empty
- lithium ion battery provided by the present application will be introduced in detail through specific embodiments.
- the lithium ion battery provided by this embodiment includes a positive electrode sheet, a separator and a negative electrode sheet formed by winding, wherein:
- the positive electrode sheet includes a positive electrode current collector, a conductive protection layer, a positive electrode active layer and a tab, and the positive electrode current collector sequentially includes a first end region, an installation region, an active layer region, a second end region and an empty foil region along the winding direction;
- the conductive protective layer is arranged on the active layer area and the second end area of the two functional surfaces of the positive electrode current collector, the positive electrode ear is arranged on the installation area and connected to the positive electrode current collector, and the conductive protective layer of the positive electrode active layer is arranged on the active layer area away from the positive electrode collector surface.
- the surfaces of the conductive protection layers on the surfaces of the first end region and the second end region of the positive electrode sheet are respectively pasted with first adhesive paper and second adhesive paper.
- the manufacturing process of the positive electrode sheet includes:
- the conductive protective slurry is coated on the two active layer regions and the two second end regions of the two functional surfaces of the positive electrode current collector by the gravure coating method to form two conductive protective layers, and the thickness of the conductive protective layers is 5 ⁇ m;
- the positive electrode current collector is aluminum foil
- the thickness of the two positive active layers is 87 ⁇ m.
- the prepared positive electrode sheet, matched with the conventional negative electrode sheet in the field, the separator and the electrolyte are made into a lithium ion battery according to the conventional lithium battery manufacturing process, and the battery capacity is about 4970mAh.
- the structure of the lithium ion battery provided in this embodiment is basically the same as that of Embodiment 1, except that the conductive protective layer is disposed on the first end region, the active layer region and the second end region of the two functional surfaces of the positive electrode current collector.
- step 2 in this example also includes coating the conductive protective paste on the two first end regions of the two functional surfaces of the positive electrode current collector to form Conductive protective layer, the thickness of the conductive protective layer is 5 ⁇ m.
- the lithium ion battery provided in this example has basically the same structure and manufacturing process as Example 2. The difference is that the thickness of the conductive protection layer disposed in the second end region in Step 2 of Example 3 is 15 ⁇ m.
- the lithium-ion battery provided in this embodiment is basically the same in structure and manufacturing process as in Embodiment 2. The difference is that the thicknesses of the conductive protective layers disposed in the first end region and the second end region in step 2 of this embodiment 4 Both are 15 ⁇ m.
- the structure of the lithium ion battery provided in this embodiment is basically the same as that of Embodiment 1, the difference is that the conductive protective layer disposed in the second end region is further provided with an insulating protective layer away from the surface of the positive electrode current collector.
- the manufacturing process of the positive electrode sheet in this example is basically the same as that in Example 1, the difference is that it also includes the following steps:
- the gravure coating method coat the insulating protective slurry on the conductive protective layer of the second end region away from the surface of the positive electrode current collector to form an insulating protective layer, and the thickness of the insulating protective layer is 10 ⁇ m.
- the structure of the lithium-ion battery provided in this embodiment is basically the same as that of Embodiment 5. The difference is that the conductive protective layer is arranged on the first end region, the active layer region and the second end region of the two functional surfaces of the positive electrode current collector.
- the conductive protective layer in the first end region is provided with an insulating protective layer away from the surface of the positive electrode current collector.
- step 2 in Example 6 also includes coating the conductive protective paste on the two first end regions of the two functional surfaces of the positive electrode current collector.
- a conductive protective layer is formed, and the thickness of the conductive protective layer is 5 ⁇ m; the conductive protective layer in the first end region is coated with an insulating protective slurry away from the surface of the positive electrode current collector to form an insulating protective layer, and the thickness of the insulating protective layer is 5 ⁇ m.
- the structure and manufacturing process of the lithium ion battery provided in this embodiment are basically the same as those in Embodiment 6.
- the difference is that the thickness of the insulating protective layer in Step 2 of Embodiment 7 is all 15 ⁇ m.
- the lithium ion battery provided in this example has the same structure as Example 4, and the manufacturing process is basically the same. The difference is that in step 1, the dry powder mass ratio of lithium iron phosphate, polyvinylidene fluoride, and carbon black is 69:28:3.
- the structure of the lithium ion battery provided in this embodiment is basically the same as that of Embodiment 8. The difference is that it further includes an insulating protective layer with the conductive protective layer disposed on the first end region and the second end region away from the surface of the positive electrode current collector.
- the preparation process of the positive electrode sheet provided in this example is basically the same as that in Example 8, the difference is that the thickness of the insulating protective layer is 10 ⁇ m.
- the lithium ion battery provided in this example has the same structure as Example 8, and the manufacturing process is basically the same. The difference is that the dry powder mass ratio of lithium iron phosphate, polyvinylidene fluoride, and carbon black in step 1 is 85:10:5.
- the structure and fabrication process of the lithium ion battery provided in this embodiment are basically the same as those in Embodiment 10. The difference is that the thickness of the conductive protection layer disposed in the active layer region is 10 ⁇ m.
- the structure of the lithium ion battery provided in this embodiment is basically the same as that of Embodiment 10, the difference is that the conductive protective layer is arranged on the active layer region and the second end region of the two functional surfaces of the positive electrode current collector, and is arranged on the second end portion The conductive protective layer in the area is far away from the insulating protective layer on the surface of the positive electrode current collector.
- step 2 does not include coating the conductive protective paste on the two first end regions of the two functional surfaces of the positive electrode current collector, including An insulating protective layer is formed by coating the insulating protective slurry on the conductive protective layer of the second end region away from the surface of the positive electrode current collector, and the thickness of the insulating protective layer is 5 ⁇ m.
- the lithium ion battery provided in this example has the same structure as Example 10, and the manufacturing process is basically the same. The difference is that in step 3, the dry powder mass ratio of lithium cobalt oxide, polyvinylidene fluoride, and carbon black is 85:10:5.
- the lithium ion battery provided in this example has the same structure as Example 13, and the manufacturing process is basically the same. The difference is that in step 1, the dry powder mass ratio of lithium iron phosphate, polyvinylidene fluoride, and carbon black is 97:1.5:1.5.
- the lithium ion battery provided in this example has the same structure as that of Example 10, and the manufacturing process is basically the same. The difference is that the inorganic filler in step 1 is alumina.
- the lithium ion battery provided in this example has the same structure as Example 15, and the manufacturing process is basically the same. The difference is that the D50 of the inorganic filler alumina in step 1 is 0.5 ⁇ m.
- the lithium-ion battery provided in this example has the same structure as Example 10, and the manufacturing process is basically the same.
- the inorganic fillers in step 1 are lithium iron phosphate and aluminum oxide, and the mass ratio of lithium iron phosphate and aluminum oxide is 1 : 1, D50 of lithium iron phosphate is 0.8 ⁇ m, and D50 of alumina is 0.5 ⁇ m.
- the lithium ion battery provided in this example has the same structure as Example 10, and the manufacturing process is basically the same. The difference is that the D50 of the inorganic filler lithium iron phosphate in step 1 is 4 ⁇ m.
- the lithium ion battery provided in this example has the same structure as Example 10, and the manufacturing process is basically the same. The difference is that the inorganic filler in step 1 is lithium nickel cobalt manganate, and the D50 of lithium nickel cobalt manganate is 4 ⁇ m.
- the two functional surfaces of the positive electrode current collector sequentially include a first end region, a mounting region, an active layer region, and a second end region along the winding direction. Both the active layer region and the second end region are provided with a conductive safety coating.
- the lithium ion battery provided by this comparative example includes a positive electrode sheet, a separator and a negative electrode sheet formed by winding, wherein: the positive electrode sheet includes a positive electrode current collector, a conductive protective layer disposed in the region of the positive electrode active layer, and a conductive protective layer disposed on the conductive protective layer away from the positive electrode current collector.
- the positive electrode active layer on the surface, the preparation method of the positive electrode sheet comprises the following steps:
- the protective slurry is coated on the active layer regions of the two functional surfaces of the positive electrode current collector by the gravure coating method to form two conductive protective layers, and the thickness of the conductive protective layers is both 5 ⁇ m;
- the positive electrode current collector is aluminum foil
- the thickness of the two positive active layers is 87 ⁇ m.
- Table 1 lists the positive electrode sheets of Examples 1-20 and Comparative Example 1 to make the differences between the positive electrode sheets provided by Examples 1-20 and Comparative Example 1 more intuitive.
- the lithium-ion batteries obtained on the basis of the above Examples 1-20 and Comparative Example 1 were subjected to a full-charge acupuncture test and a heavy object impact test. The test results are shown in Table 2.
- Full-charge acupuncture test Place the lithium-ion battery in a normal temperature environment, charge the lithium-ion battery with a constant current of 0.5C to a voltage of 4.45V, and then charge it with a constant voltage until the current drops to 0.025C, and stop charging. Use a steel nail with a diameter of 4mm to vertically pass through the center of the lithium-ion battery at a speed of 30mm/s. The steel nail remains in the lithium-ion battery for 300s. If the lithium-ion battery does not catch fire or explode, it is recorded as passing. 15 lithium-ion batteries obtained in each example were tested, and the pass rate of the full-charge acupuncture test was the ratio of the number of lithium-ion batteries that passed the full-charge acupuncture test to 15.
- Heavy object impact test place the lithium-ion battery in a normal temperature environment, charge the lithium-ion battery with a constant current of 0.2C to a voltage of 4.45V, and then charge it with a constant voltage until the current drops to 0.025C, stop charging, and then charge the battery with a constant current of 0.5 C constant current discharge, put it at 3.0V, and cycle 5 times. After the last battery is fully charged, carry out the heavy object impact test within 24 hours.
- the lithium-ion batteries of Examples 1-20 showed higher pass rates of the full-charge acupuncture test and the pass rate of the heavy object impact test. It shows more excellent safety performance during the process and the impact of heavy objects, indicating that increasing the protection area of the protective layer on the surface of the positive electrode current collector can improve the safety of the lithium-ion battery containing the cathode sheet during the needle punching process and the impact of heavy objects. performance.
- Example 2-7 Compared with Example 1, the pass rates of the full-electric acupuncture test and the heavy-object impact test of Examples 2-7 are higher, and the pass-rate of the full-electric acupuncture test and the heavy-object impact test of Example 7 are passed The rate is the best, indicating that with the increase of the thickness of the protective layer, it is beneficial to improve the safety performance of the lithium ion battery containing the positive electrode during the needle punching process and the heavy object impact process, and an insulating protective layer is arranged on the conductive protective layer. It is possible to further improve the safety performance of the lithium ion battery including the positive electrode sheet during the needling process and the heavy object impact process.
- Example 4 Compared with Example 4, the pass rates of the full-electric acupuncture test and the weight impact test of Examples 8 and 10 are reduced, indicating that increasing the content of the binder in the protective layer can further improve the lithium containing the positive electrode sheet. Safety performance of ion batteries during acupuncture and heavy impact.
- Example 4 Compared with Example 10, the pass rate of the full-electric acupuncture test and the pass rate of the heavy object impact test in Example 13 are improved, which is due to the increase in the content of the binder in the positive active layer, but the high content of the binder does not cause problems. It is beneficial to the electrical performance of lithium ion batteries; the pass rate of the full-charge acupuncture test in Example 14 is reduced, indicating that the content of the binder in the protective layer should not be too low. Therefore, it is recommended to increase the content of the binder in the protective layer.
- Examples 15-19 have higher pass rates of the full-electric acupuncture test and heavy object impact test, indicating that the types of inorganic fillers also have certain differences in safety tests.
Abstract
Description
Claims (25)
- 一种锂离子电池,其中,所述锂离子电池包括正极片、负极片、隔膜,所述正极片、所述隔膜、所述负极片依次层叠后由内向外卷绕成形;其中,所述正极片包括正极集流体,所述正极集流体的至少一个功能表面设置有保护层,且所述保护层远离所述正极集流体的表面设置有正极活性层;在所述正极集流体的卷绕方向上,所述保护层的长度大于所述正极活性层的长度。
- 根据权利要求1所述的锂离子电池,其中,所述正极集流体的至少一个功能表面包括活性层区域,还包括第一端部区域和/或第二端部区域;所述保护层包括导电保护层,所述导电保护层设置在所述第一端部区域和/或第二端部区域、活性层区域,且设置在所述活性层区域的导电保护层远离所述正极集流体的表面设置有所述正极活性层。
- 根据权利要求2所述的锂离子电池,其中,所述保护层还包括绝缘保护层,所述绝缘保护层设置在所述第一端部区域和/或第二端部区域的导电保护层远离所述正极集流体的表面。
- 根据权利要求1-3任一项所述的锂离子电池,其中,所述保护层包括无机填料,且所述无机填料的D 50小于所述正极活性层中活性物质的D 50。
- 根据权利要求4所述的锂离子电池,其中,所述无机填料包括含锂过渡金属氧化物和/或陶瓷材料。
- 根据权利要求5所述的锂离子电池,其中,所述含锂过渡金属氧化物选自钴酸锂、镍钴锰三元材料、镍钴铝三元材料、镍钴锰铝四元材料、磷酸铁锂、磷酸锰锂、磷酸钒锂、锰酸锂、富锂锰基中的一种或多种;所述陶瓷材料选自氧化铝、勃姆石、二氧化锆、二氧化钛、二氧化硅、蒙脱土、氧化镁、氢氧化镁中的一种或多种。
- 根据权利要求1-6任一项所述的锂离子电池,其中,所述保护层与正极集流体之间的粘结力大于所述保护层与正极活性层之间的粘结力;和/或,所述保护层与正极集流体之间的粘结力大于所述正极活性层中活性物质颗粒之间的粘结力。
- 根据权利要求7所述的锂离子电池,其中,所述保护层中粘结剂的质量分数大于所述正极活性层中粘结剂的质量分数。
- 根据权利要求7所述的锂离子电池,其中,将所述保护层从所述正极集流体表面剥离后,所述正极集流体上残留的保护层总质量占剥离前正极集流体上的保护层总质量的10%以上。
- 根据权利要求7所述的锂离子电池,其中,将所述保护层从所述正极集流体表面剥离后,所述正极集流体上残留的保护层总面积占剥离前正极集流体上的保护层总面积的70%以上。
- 根据权利要求2所述的锂离子电池,其中,所述导电保护层按照质量百分含量包括50%-98%的无机填料、0.5%-10%的第一导电剂以及1.5%-50%的第一粘结剂。
- 根据权利要求3所述的锂离子电池,其中,所述绝缘保护层按照质量百分含量包括50%-96%的陶瓷材料以及4%-50%的第二粘结剂。
- 根据权利要求1-12任一项所述的锂离子电池,其中,所述保护层的厚度为所述正极活性层厚度的1%-50%。
- 根据权利要求2所述的锂离子电池,其中,设置在所述第一端部区域的导电保护层的厚度为1-25μm,设置在所述第二端部区域的导电保护层的厚度为1-25μm,设置在所述活性层区域的导电保护层的厚度为1-10μm。
- 根据权利要求14所述的锂离子电池,其中,设置在所述第一端部区域和/或第二端部区域、设置在所述活性层区域的导电保护层的厚度相同。
- 根据权利要求3所述的锂离子电池,其中,设置在所述第一端部区域的导电保护层远离所述正极集流体的表面的绝缘保护层的厚度为1-15μm;设置在所述第二端部区域的导电保护层远离所述正极集流体的表面的绝缘保护层的厚度为1-15μm。
- 根据权利要求1-16任一项所述的锂离子电池,其中,所述正极集流体的至少一个功能表面还包括露出所述正极集流体的安装区,且所述安装区与所述正极集流体的一个侧面连通。
- 根据权利要求17所述的锂离子电池,其中,所述正极片还包括正极耳,所述正极耳设置在所述正极集流体一个功能表面的安装区,且所述安装区靠近卷绕中心的一侧和远离卷绕中心的一侧均设置有所述保护 层。
- 根据权利要求2所述的锂离子电池,其中,所述第一端部区域沿所述正极集流体卷绕方向包括第一平直区、安装区、第二平直区、第三平直区和第一圆弧区;所述安装区设置正极耳,所述正极片表面粘贴有第一胶纸,且所述第一胶纸与设置在所述第三平直区的保护层的表面、设置在所述第一圆弧区的保护层的表面以及设置在所述活性层区域的正极活性层的至少部分表面粘结。
- 根据权利要求2所述的锂离子电池,其中,所述第二端部区域沿所述正极集流体卷绕方向包括第二圆弧区和第四平直区,所述正极片表面粘贴有第二胶纸,且所述第二胶纸与设置在所述活性层区域的正极活性层的至少部分表面、设置在所述第二圆弧区的保护层表面以及设置在所述第四平直区的保护层的至少部分表面粘结。
- 根据权利要求2所述的锂离子电池,其中,所述正极集流体的至少一个功能表面包括空箔区,所述空箔区位于所述第二端部区域远离所述卷绕中心的末端,所述空箔区表面不设置所述保护层。
- 根据权利要求2所述的锂离子电池,其中,所述正极集流体远离所述卷绕中心的末端的两个功能表面均不包括空箔区。
- 根据权利要求1-22任一项所述的锂离子电池,其中,所述负极片包括负极集流体和设置在所述负极集流体至少一个功能表面的负极活性层,所述负极活性层的长度大于所述正极活性层的长度。
- 根据权利要求23所述的锂离子电池,其中,所述负极集流体的至少一个功能表面包括空箔区,所述空箔区位于所述负极集流体远离所述卷绕中心的末端,所述空箔区表面不设置所述负极活性层。
- 根据权利要求23所述的锂离子电池,其中,所述负极集流体远离所述卷绕中心的末端的两个功能表面均不包括空箔区。
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Cited By (4)
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CN115084429A (zh) * | 2022-07-08 | 2022-09-20 | 珠海冠宇电池股份有限公司 | 一种正极片及锂离子电池 |
WO2024088339A1 (zh) * | 2022-10-26 | 2024-05-02 | 珠海冠宇电池股份有限公司 | 一种电极组件和电池 |
WO2024087880A1 (zh) * | 2022-10-26 | 2024-05-02 | 珠海冠宇电池股份有限公司 | 电极组件和电池 |
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CN116250106A (zh) * | 2022-03-31 | 2023-06-09 | 宁德新能源科技有限公司 | 电化学装置和电子装置 |
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KR20230039693A (ko) | 2023-03-21 |
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CN116783748A (zh) | 2023-09-19 |
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