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Novel lithium ion battery positive pole piece as well as preparation method and application thereof

A technology for lithium-ion batteries and positive pole pieces, applied in electrode manufacturing, battery electrodes, positive electrodes, etc., can solve the problem of slow particle diffusion

Inactive Publication Date: 2021-03-23
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive pole piece with the above structure, especially the positive pole piece coated with a total thickness of 160-210 μm, can solve the problem of slow diffusion of the electrolyte from the liquid phase through the solid-liquid interface between the positive pole piece and the electrolyte to the inside of the positive pole piece at low temperature. problem, and can reduce the polarization internal resistance of lithium-ion batteries discharged at low temperature, that is, to improve the polarization problem of the positive electrode sheet in the application process

Method used

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  • Novel lithium ion battery positive pole piece as well as preparation method and application thereof
  • Novel lithium ion battery positive pole piece as well as preparation method and application thereof
  • Novel lithium ion battery positive pole piece as well as preparation method and application thereof

Examples

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preparation example Construction

[0043] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0044] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0046] The preparation method of the positive pole piece of the present invention: it is divided into 3 steps to carry out;

[0047] (1) Lithium cobalt oxide, fast ion conductor material lithium titanium aluminum phosphate (LATP), PVDF, and carbon nanotubes are mixed with a weight ratio of 94%: 3%: 2%: 1%, and the mixture is dispersed in NMP, After being stirred by double planets, the positive electrode slurry is obtained. The slurry was coated on the front and back of the aluminum foil current collector with a thickness of 12 μm, dried after coating, and coated on one side with a thickness of 40 μm to obtain a positive electrode sheet coated with the first active material layer.

[0048] (2) Mix lithium cobaltate, carbon nanotubes, conductive graphene, and PVDF at a weight ratio of 96%:1.5%:0.5%:2%, disperse the mixture in NMP, and obtain the positive electrode slurry after being stirred by double planets . The slurry was coated on the positive electrode sheet coated with t...

Embodiment 2

[0056] The rest of the positive electrode sheet preparation method of embodiment 2 is the same as that of embodiment 1, except that the coating thickness of step 1 is changed from 40 μm to 50 μm, and the coating thickness of step 2 is changed from 40 μm to 30 μm; preparation of lithium ion battery and testing The steps are the same.

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Abstract

The invention provides a novel lithium ion battery positive pole piece as well as a preparation method and application thereof. The positive pole piece comprises a positive current collector layer, afirst active substance layer and a second active substance layer, wherein the first active substance layer comprises a lithium composite metal oxide active material, a fast ion conductor material, a conductive agent and a binder; the second active material layer includes a lithium composite metal oxide active material, a conductive agent, and a binder. By using the novel two-layer coating pole piece structure design, the pole piece has higher ionic conductivity and electronic conductivity than those of a conventional pole piece with a one-layer coating structure at present; when applied to a lithium ion battery system, the novel positive pole piece can effectively improve the surface resistance of the positive pole piece and reduce the internal resistance of the battery; and as for a lithium ion battery obtained by assembling the novel positive pole piece, the low-temperature discharge performance of the battery can be obviously improved, the EIS impedance can be reduced, and the rateperformance and the cycle performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a novel lithium-ion battery positive pole piece, a preparation method thereof and an application in lithium-ion batteries. Background technique [0002] Power batteries and high-voltage digital batteries are currently developing rapidly, and are widely used in 3C consumer digital fields such as mobile phones, notebook computers, tablet computers, and small Bluetooth batteries and electric vehicles. Whether it is digital or power fields, the performance requirements of lithium-ion batteries are getting higher and higher. In recent years, the volumetric energy density of digital lithium-ion batteries has almost reached the limit of materials, which directly limits the application of lithium-ion batteries in the field of high-voltage digital batteries, and the mass energy density requirements of power lithium-ion batteries are also very high. [0003] In o...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M4/62H01M10/0525
CPCH01M4/0404H01M4/131H01M4/1391H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 曾家江李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD