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Composite current collector, electrode plate and lithium ion battery

A technology for current collectors and positive electrode sheets, applied in the field of lithium batteries, can solve the problems of poor leveling and uneven coating of carbon-coated coatings, and achieve the effects of stable performance, improved peel strength, and poor leveling.

Inactive Publication Date: 2021-06-25
惠州锂威电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the objectives of the present invention is to provide a composite current collector to solve the current problems of poor leveling and uneven coating of carbon-coated coatings. The composite current collector provided by the present invention not only reduces the surface tension of the foil, Simultaneously improved coating uniformity and adhesion

Method used

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  • Composite current collector, electrode plate and lithium ion battery
  • Composite current collector, electrode plate and lithium ion battery
  • Composite current collector, electrode plate and lithium ion battery

Examples

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Embodiment 1

[0039] Such as Figure 3-4As shown, a composite current collector includes a substrate 1, a carbon-coated layer 3 and a first binder 2; the carbon-coated layer 3 is coated on at least one surface of the substrate 1; the first binder 2 is arranged on the Between the substrate 1 and the carbon-coated layer 3, and coated on the substrate 1; wherein, the viscosity of the first adhesive 2 is 20-500mpa·s; the peel strength of the first adhesive 2 is greater than or equal to 500N / m. Among them, the substrate 1 can be copper foil or aluminum foil, but because the dyne value of the aluminum foil is low, the surface tension of the water-based slurry coated on the surface of the aluminum foil is relatively high, and the leveling property is poor, so the composite current collector of the present invention is preferred It is suitable for aluminum foil substrate 1, and the carbon coating layer 3 is preferably a water-based carbon coating layer 3, which solves the problem of high pollution...

Embodiment 2

[0059] An electrode sheet, comprising a current collector and an active material layer coated on the current collector, and the current collector is the composite current collector described in Example 1.

Embodiment 3

[0061] A lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet and a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet being the electrode sheet described in embodiment 2 .

[0062] Wherein, the active material layer coated on the positive electrode sheet can include but not limited to chemical formula such as Li a Ni x co y m z o 2- b N b (wherein 0.95≤a≤1.2, x>0, y≥0, z≥0, and x+y+z=1, 0≤b≤1, M is selected from one or more combinations of Mn and Al , N is selected from the combination of one or more of F, P, S), the combination of one or more of the compounds shown, the positive active material can also include but not limited to LiCoO 2 , LiNiO 2 、LiVO 2 , LiCrO 2 , LiMn 2 o 4 、LiCoMnO 4 , Li 2 NiMn 3 o 8 、LiNi 0.5 mn 1.5 o 4 、LiCoPO 4 、LiMnPO 4 、LiFePO 4 、LiNiPO 4 、LiCoFSO 4 、CuS 2 , FeS 2 、MoS 2 , NiS, TiS 2 On...

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Abstract

The invention provides a composite current collector, an electrode plate and a lithium ion battery. The composite current collector comprises a base material, a carbon coating layer and a first binder. The carbon coating layer coats at least one surface of the base material. The first binder is arranged between the base material and the carbon coating layer and coats the base material. The viscosity of the first binder is 20 to 500 mpa.s. The peel strength of the first binder is greater than or equal to 500 N / m. Compared with the prior art, the composite current collector provided by the invention has the advantages that the polarity and surface tension of the current collector are greatly improved by adding the first binder between the carbon coating layer and the base material, and particularly for an aluminum foil material, the selectivity of the aluminum foil to carbon coating slurry is greatly reduced; The water-based carbon coating layer can also be uniformly applied to the base material, so that the problems of poor leveling property and non-uniform coating of the current carbon coating are solved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a composite current collector, an electrode pole piece and a lithium ion battery. Background technique [0002] In recent years, as people recognize the concept of green travel, energy and environmental protection, the development of energy storage equipment has become more rapid, and the competition among various energy industries has become increasingly fierce. In order to meet people's demand for energy, new technologies are springing up like mushrooms after rain, and the development is particularly rapid. At present, the development of energy density of lithium-ion batteries seems to have entered a bottleneck and cannot be broken through in a short time. Research on lithium batteries is gradually moving towards safety, stability, and reliability. Research. [0003] The carbon-coating improvement of the current collector is an emerging technology in recent years. The carbon-c...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCH01M4/667H01M4/663H01M4/13H01M10/0525Y02E60/10
Inventor 李富孙先维赖旭伦陈杰杨山郑明清
Owner 惠州锂威电子科技有限公司
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