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Positive plate and lithium ion battery containing positive plate

A lithium-ion battery, positive electrode technology, applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problems of high temperature internal resistance increase, cycle performance degradation, etc., to slow down the exothermic reaction, avoid short-circuit discharge, and improve the cycle. The effect of performance degradation

Inactive Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to improve the deficiencies of the existing technology, especially for the improvement of safety coatings containing high-nickel ternary positive electrode materials (NCM materials) for lithium-ion batteries, solve the serious attenuation of cycle performance and high-temperature internal resistance of safety coatings containing NCM materials overgrowth problem

Method used

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preparation example Construction

[0059] The present invention also provides a method for preparing the above positive electrode sheet, the method comprising the following steps:

[0060] Prepare the safety coating slurry and the positive electrode active material layer slurry respectively, wherein the safety coating includes the first positive electrode active material, the first conductive agent and the first binder; the first positive electrode active material is selected from high Nickel ternary cathode material and lithium cobalt oxide material;

[0061] The positive electrode sheet is prepared by coating the safety coating slurry and the positive electrode active material layer slurry on the positive electrode current collector by coating equipment, drying, cutting, and sheeting.

[0062] According to the present invention, described method specifically comprises the following steps:

[0063] (1-1) Mix the first positive electrode active material, the first conductive agent and the first binder, then ad...

Embodiment 1

[0077] (1) Mix positive electrode active material (80wt% NCM523+20wt% LCO): polyvinylidene fluoride (molecular weight between 1 million and 1.1 million, denoted as 1 million): conductive carbon black in a mass ratio of 90:8.8:1.2 , add it to NMP, use a ball mill to stir evenly at high speed, use a coater to coat it on an aluminum foil with a thickness of 10 μm, and dry to remove NMP to obtain figure 1 Lithium-ion battery current collectors with medium safety coating, aluminum foil, and safety coating. The thickness of a single layer of security coating is about 15 μm.

[0078] (2) The above-mentioned lithium-ion battery current collector with safety coating is coated with positive electrode slurry on both sides, and the positive electrode slurry is composed of 97.5wt% lithium cobaltate (LCO), 1.1wt% polyvinylidene fluoride ( Molecular weight is between 800,000-900,000, denoted as 800,000) and 1.4wt% conductive carbon black, the positive electrode sheet that is cut into 65mm *...

Embodiment 2

[0080] Others are the same as in Example 1, except that the mass ratio of NCM523 and LCO in step (1) is 50wt% NCM523+50wt% LCO.

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Abstract

The invention provides a positive plate and a lithium ion battery containing the positive plate. The safety coating and the positive active material layer coating the surface of the positive current collector are controlled; in particular, the selection of a first positive active material in the safety coating is controlled, the NCM material and the LCO material are mixed, high-voltage small-particle lithium cobalt oxide is used as one of fillers of the safety coating, the doped high-voltage lithium cobalt oxide can provide support for the NCM material; by utilizing the safety coating, short circuit failure of the negative electrode and the aluminum foil caused by burrs of the aluminum foil can be avoided, the mechanism is improved, the safety is improved, and meanwhile, in the process ofimproving the safety, the problems of cycle capacity attenuation and large increase of high-temperature internal resistance caused by crushing of NCM material particles can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a positive electrode sheet and a lithium ion battery containing the positive electrode sheet. The use of the positive electrode sheet can improve the increase of the internal resistance of the safety coating during circulation. Background technique [0002] With the advantages of high energy density, long cycle life, and high energy conversion efficiency, lithium-ion batteries firmly occupy a dominant position in the power supply of mobile devices. Our daily life has also been closely linked with lithium-ion batteries. However, the continuous fermentation of some mobile phone explosions has made the safety of lithium-ion batteries more and more people's attention. [0003] In order to improve the safety performance, the current conventional practice is to coat a layer of safety coating on the current collector, and improve the safety performance by coating t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M4/131H01M4/505H01M4/525H01M10/4235H01M10/0525H01M2004/028H01M4/366H01M4/623Y02E60/10H01M4/364H01M4/62H01M2004/021
Inventor 徐昕彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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