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Ceramic diaphragm for lithium ion batteries and method for manufacturing ceramic diaphragm

A technology of lithium-ion batteries and ceramic diaphragms, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve problems such as short-circuit, melting, and explosion of positive and negative electrodes of lithium-ion batteries, and achieve The effect of eliminating the possibility of explosion and improving safety

Inactive Publication Date: 2019-02-19
湖北江升新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are some deficiencies in the existing polyolefin separators. First, the melting point of polyolefin is relatively low. A large degree of shrinkage and further lead to melting, causing a short circuit between the positive and negative electrodes of the lithium-ion battery and causing an explosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A lithium-ion battery ceramic diaphragm of the present invention comprises a polyolefin microporous membrane substrate, one surface of the polyolefin microporous membrane substrate is coated with a ceramic slurry, the ceramic slurry includes inorganic ceramic particles and a binder, and the binder is Polyvinylidene fluoride resin fixes ceramic particles on the surface or inside of polyolefin microporous membrane.

[0016] Further, the inorganic ceramic particles are alumina, and the inorganic ceramic particles can improve the thermal performance and mechanical properties of the diaphragm, and improve the cycle performance and rate performance of the battery.

[0017] Further, adding a cross-linkable resin to the adhesive can reduce the risk of ceramic falling off.

[0018] Further, the surface of the separator is coated with polyethylene glycol, PC and PAN polymer materials to form a gel layer, and the coating area is controlled at 40%, so as to prevent the short circui...

Embodiment 2

[0023] A lithium-ion battery ceramic diaphragm of the present invention comprises a polyolefin microporous membrane substrate, at least one surface of the polyolefin microporous membrane substrate is coated with a ceramic slurry, and the ceramic slurry includes inorganic ceramic particles and a binder, and the binder For polyacrylonitrile, ceramic particles are fixed on the surface or inside of polyolefin microporous membrane.

[0024] Further, the inorganic ceramic particles are titanium dioxide, and the inorganic ceramic particles can improve the thermal performance and mechanical properties of the diaphragm, and improve the cycle performance and rate performance of the battery.

[0025] Further, adding a cross-linkable resin to the adhesive can reduce the risk of ceramic falling off.

[0026] Further, the surface of the separator is coated with polyethylene glycol, PC and PAN polymer materials to form a gel layer, and the coating area is controlled at 50%, so as to prevent ...

Embodiment 3

[0031] A lithium-ion battery ceramic diaphragm of the present invention comprises a polyolefin microporous membrane substrate, at least one surface of the polyolefin microporous membrane substrate is coated with a ceramic slurry, and the ceramic slurry includes inorganic ceramic particles and a binder, and the binder For polyvinylidene fluoride resin, ceramic particles are fixed on the surface or inside of polyolefin microporous membrane.

[0032] Further, the inorganic ceramic particles are aluminum oxide, magnesium oxide and titanium dioxide, and the inorganic ceramic particles can improve the thermal performance and mechanical properties of the diaphragm, and improve the cycle performance and rate performance of the battery.

[0033] Further, adding a cross-linkable resin to the adhesive can reduce the risk of ceramic falling off.

[0034] Further, the surface of the separator is coated with polyethylene glycol, PC and PAN polymer materials to form a gel layer, and the coat...

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PUM

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Abstract

The invention belongs to the technical field of processing of diaphragms for batteries, and discloses a ceramic diaphragm for lithium ion batteries and a method for manufacturing the ceramic diaphragm. The ceramic diaphragm for the lithium ion batteries comprises a polyolefin microporous film matrix. Ceramic slurry is coated on at least one surface of the polyolefin microporous film matrix and comprises inorganic ceramic particles and adhesive, the adhesive is polyvinylidene fluoride resin or polyacrylonitrile, and the ceramic particles are fixed to the surfaces or the insides of polyolefin microporous films. The method for preparing the ceramic diaphragm for the lithium ion batteries includes steps of coating the ceramic slurry on the surfaces of the polyolefin microporous film matrix; sequentially carrying out drying and ultraviolet irradiation. The ceramic diaphragm and the method have the advantages that the ceramic slurry is coated on the surfaces of the polyolefin microporous film matrix, accordingly, the ceramic diaphragm is in stable states with surface treatment convenience, the possibility of explosion due to short circuit of negative and positive electrodes of the batteries can be completely eradicated, and the use safety of the lithium ion batteries can be improved.

Description

technical field [0001] The invention specifically relates to a lithium-ion battery ceramic diaphragm and a manufacturing method, belonging to the technical field of battery diaphragm processing. Background technique [0002] At present, there are some deficiencies in the existing polyolefin separators. First, the melting point of polyolefin is relatively low. A large degree of shrinkage further leads to melting, causing a short circuit between the positive and negative electrodes of the lithium-ion battery and causing an explosion. Contents of the invention [0003] The technical problem to be solved in the present invention overcomes the existing defects, and provides a lithium-ion battery ceramic diaphragm and a manufacturing method. By coating the ceramic slurry on the surface of the polyolefin microporous membrane substrate, the ceramic diaphragm is in a stable state that is convenient for surface treatment. state, thereby eliminating the possibility of an explosion c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/434H01M50/443H01M50/446H01M50/489H01M50/491
CPCH01M50/40H01M50/403H01M50/409Y02E60/10
Inventor 洪良仕张冈
Owner 湖北江升新材料有限公司
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