Preparation method of a lithium ion battery for improving the comprehensive performance of a high-voltage cathode material

A technology for lithium ion batteries and cathode materials, applied in electrode manufacturing, electrode collector coating, secondary batteries, etc. Current rate discharge performance and cycle performance, large solid content, and the effect of improving processability

Inactive Publication Date: 2019-01-22
ZHUHAI COSMX BATTERY CO LTD
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor cycle performance and high current rate discharge performance of high-voltage positive electrode materials of lithium-ion batteries, and to provide a preparation method for lithium-ion batteries that improves the comprehensive performance of high-voltage positive electrode materials

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  • Preparation method of a lithium ion battery for improving the comprehensive performance of a high-voltage cathode material

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specific Embodiment approach 1

[0014] Specific embodiment one: what this embodiment records is a kind of preparation method of the lithium-ion battery that improves the comprehensive performance of high-voltage positive electrode material, and the concrete steps of described method are as follows:

[0015] Step 1: Coating a layer of positive electrode slurry A with a thickness of 5um~25um on the positive electrode current collector to form a better conductive coating; the specific configuration method of the positive electrode slurry A is: first add a conductive agent and binder, and finally add the main material of the positive electrode, and the main material of the positive electrode is added in 2 to 5 times on average; (this slurry can be prepared in the production line or in the laboratory)

[0016] Step 2: After the positive electrode slurry A is coated, apply a layer of positive electrode slurry B with a thickness of 150-200um. After the coating is completed, it can be sorted according to the conventi...

specific Embodiment approach 2

[0033] Specific embodiment two: the preparation method of a kind of lithium ion battery that improves the comprehensive performance of high-voltage positive electrode material described in specific embodiment one, in step one, described positive electrode slurry A is made of positive electrode main material, conductive agent, binding agent Agent composition, the positive electrode main material: conductive agent: binder mass ratio = 96.8% ~ 97.2%: 1.3% ~ 1.8%: 1.0% ~ 1.9%.

specific Embodiment approach 3

[0034] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 3 The preparation method of a lithium-ion battery that improves the comprehensive performance of the high-voltage positive electrode material described in the first specific embodiment, in step 2, the positive electrode slurry B is composed of a positive electrode main material, a conductive agent, and a binder Composition, the mass ratio of the positive electrode main material: conductive agent: binder = 96.8%~97.2%: 1.3%~1.8%: 1.0%~1.9%.

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Abstract

The invention relates to a preparation method of a lithium ion battery for improving the comprehensive performance of a high-voltage cathode material, belonging to the technical field of lithium ion battery preparation. The method comprises the following steps: coating a layer of positive electrode slurry A with the thickness of 5um to 25um on the positive electrode current collector to form an electrically conductive coating; The specific configuration method of the positive electrode slurry A comprises the following steps: firstly, a conductive agent and a binder are added, and finally, a positive electrode main material is added, and the positive electrode main material is added in 2 to 5 times on average; After the positive electrode slurry A is coated, a layer of positive electrode slurry B with the thickness of 150-200um is coated, and after the coating is completed, the positive electrode slurry B can be sorted according to the conventional production process; The invention hasthe advantages that the slurry dispersibility of the first coating layer is good, the surface resistance of the positive electrode sheet is small, and the positive electrode polarization can be improved; the slurry solid content of the second coating layer is large, and the machining performance of the positive electrode sheet can be improved, so as to improve the discharge performance and the cycle performance of the high-voltage positive electrode material battery at a high current rate.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery preparation, and in particular relates to a preparation method of a lithium-ion battery that improves the comprehensive performance of high-voltage positive electrode materials. Background technique [0002] Due to the low electrical conductivity of high-voltage cathode materials, the local dispersion of cathode materials and conductive agents is poor, so that lithium-ion batteries have shortcomings such as fast capacity decay, short cycle life, and large thickness expansion rate during charge and discharge. Applications on lithium-ion batteries are severely limited. Contents of the invention [0003] The purpose of the present invention is to solve the problem of poor cycle performance and high current rate discharge performance of high-voltage positive electrode materials of lithium-ion batteries, and to provide a preparation method for lithium-ion batteries that improves the compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M10/0525H01M10/0587
CPCH01M4/0404H01M4/0435H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 於志锋徐延铭彭冲李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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