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A power lithium-ion battery diaphragm and preparation method thereof

A lithium ion battery and separator technology, applied in the field of power lithium ion battery separator and its preparation, can solve the problems of poor high temperature resistance performance of the separator, poor battery safety performance, etc., and achieve the effect of improving high temperature resistance performance, good capacity and performance

Active Publication Date: 2021-09-24
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a power lithium-ion battery diaphragm and its preparation method, which is used to solve the problem of poor battery safety performance caused by the poor high temperature resistance of the diaphragm in the prior art

Method used

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  • A power lithium-ion battery diaphragm and preparation method thereof
  • A power lithium-ion battery diaphragm and preparation method thereof
  • A power lithium-ion battery diaphragm and preparation method thereof

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preparation example Construction

[0043] The present invention also provides a method for preparing a power lithium-ion battery diaphragm, which can prepare the above-mentioned power lithium-ion battery diaphragm, and the preparation method at least includes:

[0044] First execute step S1, add the dispersant to water, stir at the first stirring speed for the first time, and obtain the dispersant solution;

[0045] Then perform step S2, adding ceramic particles into the dispersant solution, stirring at a second stirring speed for a second time, and then ball milling to disperse to obtain a slurry;

[0046] Then step S3 is performed, adding a binder to the slurry, and stirring for a third time at a third stirring speed to obtain a coating slurry, wherein the total weight of the ceramic particles, binder and dispersant is 100 In terms of parts, the weight of the ceramic particles is between 90 and 97 parts, the weight of the binder is between 2 and 7 parts, and the weight of the dispersant is between 1 and 3 par...

Embodiment 1

[0075] In this embodiment, the composition and content of the power lithium battery diaphragm coating are: 94 parts of boehmite; 1 part of polyacrylic acid acrylamide copolymer; 4 parts of modified polyacrylic acid polymer; 1 part of ammonium polyacrylate.

[0076] The above-mentioned power lithium battery diaphragm coating slurry is coated on both sides of the PE microporous membrane with a thickness of 12 μm by a wire bar coating machine, and finally baked in a suspension oven to obtain a double-sided coating The power lithium battery separator with a thickness of 2 μm and a total thickness of 16 μm.

Embodiment 2

[0078] In this embodiment, the composition and content of the power lithium battery diaphragm coating are: 95 parts of boehmite; 1 part of polyacrylic acid acrylamide copolymer; 3 parts of modified polyacrylic acid polymer; 1 part of ammonium polyacrylate.

[0079] The above-mentioned power lithium battery diaphragm coating slurry is coated on both sides of the PE microporous membrane with a thickness of 12 μm by a wire bar coating machine, and finally baked in a suspension oven to obtain a double-sided coating The power lithium battery separator with a thickness of 2 μm and a total thickness of 16 μm.

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Abstract

The invention provides a power lithium-ion battery diaphragm and a preparation method thereof. The diaphragm at least includes a diaphragm substrate and a ceramic layer coated on at least one side surface of the diaphragm substrate. The ceramic layer passes through ceramic particles, binders, The dispersant and water are formulated into a coating slurry, coated and dried; the binder includes a mixture of polyacrylic acid acrylamide copolymer and modified polyacrylic acid polymer; ceramic particles, binder and dispersant Based on the total weight of 100 parts, the weight of the ceramic particles is between 90 and 97 parts, the weight of the adhesive is between 2 and 7 parts, and the weight of the dispersant is between 1 and 3 parts. The invention adopts the mixture of polyacrylic acid acrylamide copolymer and modified polyacrylic acid polymer as the adhesive, so that the high temperature resistance of the diaphragm is greatly improved, and the vertical and horizontal heat shrinkage is below 2% at a high temperature of 200 ° C, which can meet the power requirements. The high-temperature performance of lithium-ion batteries under 200°C thermal shock, and the batteries can still maintain good capacity and performance after vibration.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a power lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles, the demand for power batteries has increased significantly. However, there is currently no special separator for power lithium-ion batteries on the market. Conventional lithium-ion battery separators are single-layer or multi-layer polyolefin products stretched by dry or wet processes. The disadvantages of polyolefin separators mainly include two aspects: one is that polyolefin materials have limited temperature resistance, and the separator shrinks when heated. , resulting in direct contact between the positive and negative electrodes and short circuit; second, the closed cell temperature and membrane rupture temperature of the polyolefin film are relatively low. until the battery disintegrates or explode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/417H01M50/434H01M50/443H01M50/449H01M50/446H01M50/403H01M10/0525H01M50/414H01M50/489
CPCH01M10/0525H01M2220/20H01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 程跃苏晓明付以诗周博
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD