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Isolating membrane and lithium ion battery

A technology of lithium-ion batteries and separators, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of reducing the overall safety of lithium-ion batteries and insufficient safety of lithium-ion batteries, and achieve strength improvement and improvement performance effect

Inactive Publication Date: 2020-05-29
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the coating thickness is too consistent, the different requirements for coating thickness in different parts of the lithium-ion battery are ignored, and the dangerous area (such as the corner of the lithium-ion battery) is not particularly thickened, resulting in local lithium-ion batteries. Insufficient safety, which ultimately reduces the overall safety of Li-ion batteries

Method used

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  • Isolating membrane and lithium ion battery
  • Isolating membrane and lithium ion battery
  • Isolating membrane and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] (1) Preparation of positive pole piece:

[0076] The cathode material lithium cobalt oxide (LiCoO 2 ), the conductive agent Super P, and the binder polyvinylidene fluoride are mixed according to the weight ratio of 97.8:1:1.2, N-methylpyrrolidone (NMP) is added, and stirred under the action of a vacuum mixer until the system becomes uniform and transparent, and the obtained positive electrode slurry, wherein the solid content of the positive electrode slurry is 77wt%; the positive electrode slurry is evenly coated on the aluminum foil of the positive electrode current collector; After being stripped, it was dried under vacuum conditions at 85° C. for 4 hours to obtain a positive electrode sheet.

[0077] (2) Negative electrode sheet preparation:

[0078] Mix the negative electrode material artificial graphite, conductive agent Super P, thickener sodium carboxymethylcellulose (CMC), and binder styrene-butadiene rubber (SBR) in a weight ratio of 97.7:1:0.3:1, add deioni...

Embodiment 2

[0087] The preparation process of the lithium-ion battery is the same as in Example 1, the difference is that the thickness of the first coating in the first region only includes the first thickness, such as figure 2 shown.

Embodiment 3

[0089] The preparation process of the lithium-ion battery is the same as in Example 1, except that the first coating slurry is coated on both sides of a 7 μm thick porous substrate (polyethylene).

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Abstract

The invention provides an isolating membrane. The isolating membrane comprises a porous substrate and a first coating layer; the first coating is arranged on at least one surface of the porous base material; the first coating comprises inorganic particles and a binder; the first coating comprises a first region and a second region; the thickness of the coating of the first region comprises a firstthickness; the thickness of the coating of the second region comprises a second thickness; the first thickness is greater than the second thickness; the area of the second region is greater than thearea of the first region. The invention further provides a lithium ion battery. The lithium ion battery comprises a positive pole piece, a negative pole piece, and the above isolating membrane. The local coating of the isolating membrane is increased; and the isolating membrane can be applied to the lithium ion battery.

Description

technical field [0001] The present application relates to the battery field, and more specifically, to a separator and a lithium-ion battery. Background technique [0002] Lithium-ion battery separators on the market are mainly polyolefin separators, that is, single-layer separators such as polyethylene (PE) and polypropylene (PP) are used as substrates, and there are also PP / PE / PP multilayer separators, polyolefin separators The melting temperature is low (PE is about 130°C, PP is about 160°C), and when the lithium-ion battery is abused (internal short circuit, external short circuit, hot box, overcharge, etc.), these polyolefin separators are prone to thermal shrinkage at high temperatures, This in turn causes a large-area short circuit, exacerbates heat accumulation, and causes thermal runaway to cause lithium-ion batteries to burn and explode. At present, the heat resistance of the isolation film is improved by coating and modifying the ceramic (inorganic layer) on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/417H01M50/42H01M50/431H01M50/443H01M50/449H01M50/489
CPCH01M10/0525H01M50/403H01M50/44H01M50/431H01M50/443H01M50/42H01M50/489H01M50/417H01M50/449H01M10/0587Y02E60/10H01M50/446Y02P70/50H01M50/409
Inventor 傅芸芸陶涛王中旭
Owner NINGDE AMPEREX TECH
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