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Flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability

A dimensionally stable, composite ceramic membrane technology, used in electrical components, circuits, battery pack components, etc., can solve the problems of inconvenient handling, high membrane cost, cumbersome operation, etc., to achieve comprehensive electrochemical performance improvement, good size Stability, Stability-enhancing effect

Active Publication Date: 2015-11-18
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a monolayer of Al can be introduced on the polyolefin film in one "vapor deposition-hydrolysis" cycle. 2 o 3 , if it is necessary to introduce a sufficient thickness of inorganic coating, dozens or even hundreds of "vapor deposition-hydrolysis-vapor deposition" cycles are required, and the operation is cumbersome; at the same time, because trimethylaluminum is extremely active, it is inconvenient to handle
[0026] To sum up, all kinds of existing separators have certain defects, such as difficult preparation, high cost of the membrane, lack of low-temperature shutdown performance, or weak combination of the coating and the base membrane.
The comprehensive performance of the diaphragm cannot meet the requirements of the power battery diaphragm

Method used

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  • Flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability
  • Flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability
  • Flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability, prepared by the following method:

[0074] According to the mass ratio, 1 part of 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane (ECTS) (see formula 1 for structure), 1 part of diphenylsilanediol (DPSD) (see formula for structure) 2) Mix 10 parts of polyethylene glycol dimethyl ether and 0.002 parts of barium hydroxide, and react at 80° C. for 4 hours. Disperse 8 parts of 200nm silicon dioxide in ethanol, then add it to the above system, continue to react at 80°C for 8 hours, cool to room temperature, add 0.005 parts of photoinitiator diaryliodonium salt, remove under reduced pressure part of ethanol to obtain the coating solution. Coat the coating solution on both surfaces of the PP porous membrane (thickness 25 μm, porosity 55%) with hydroxyl groups with a wire bar coater, control the thickness of the composite membrane at about 40 μm, and cure it under a...

Embodiment 2

[0099] A flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability. The preparation method is except that methyl hexahydrophthalic anhydride is selected as the curing agent when curing, and thermal curing is selected as the curing method instead of light curing. Other operations All with embodiment 1 with raw material.

[0100] The Gurley value, liquid absorption rate and thermal shrinkage rate of the flexible composite ceramic membrane prepared in this example with low-temperature closed-cell performance and good dimensional stability were measured. The prepared composite membrane was used as a diaphragm, assembled into a battery, and the closed cell temperature of the composite diaphragm was measured. Test method is the same as embodiment 1.

Embodiment 3

[0102] A flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability. Its preparation method is to replace the PP porous membrane with hydroxyl groups on the surface with PP porous membranes with amino groups on the surface, and use heat curing instead of adding any catalyst during curing. Except for photocuring, other operations and raw materials are the same as in Example 1.

[0103] The Gurley value, liquid absorption rate and thermal shrinkage rate of the flexible composite ceramic membrane prepared in this example with low-temperature closed-cell performance and good dimensional stability were measured. The prepared composite membrane was used as a diaphragm, assembled into a battery, and the closed cell temperature of the composite diaphragm was measured. Test method is the same as embodiment 1.

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Abstract

The invention discloses a flexible composite ceramic membrane with low temperature closed-cell performance and good dimensional stability and a preparation method and application thereof. The preparation method for the composite ceramic membrane comprises the following steps: preparing functional slurry from precursor compounds I and II by using an aqueous sol-gel method or non-aqueous sol-gel method, coating the functional slurry on a substrate membrane containing an active functional group and carrying out heating or irradiating the substrate membrane with ultraviolet light; and immersing the obtained composite membrane in ethanol to remove a pore forming agent and carrying out hot pressing and drying so as to obtain the flexible composite ceramic membrane. The substrate membrane used for the composite ceramic membrane is a polyolefin porous membrane; the polyolefin porous membrane in the prepared composite membrane has a low closure temperature, and pores of the polyolefin porous membrane can be timely and thoroughly closed when a battery is in an abnormal operational state, which enables safety of the battery to be ensured. According to the invention, a modified nanoparticle formed in the process of sol-gel can be connected with the polyolefin substrate membrane containing the active functional group without falling off, so stability of a coating is enhanced, and comprehensive electrochemical performances of the composite membrane are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery membrane materials, and specifically relates to a polyolefin-based flexible composite ceramic membrane with low-temperature closed-cell performance and good dimensional stability, and a preparation method and application thereof. Background technique [0002] A lithium-ion battery is an electrical device that stores and releases electrical energy through the migration of lithium ions between the positive and negative electrodes. Lithium-ion batteries are widely used in small and medium-sized electronic devices such as digital cameras, mobile phones, and notebook computers because of their high specific energy, long life, no memory effect, small self-discharge effect, and fast charging. [0003] Due to the increasing shortage of chemical energy and the increasing pressure on environmental protection, many countries have devoted themselves to the development of environmentally friendly e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 胡继文胡盛逾李妃刘峰刘国军涂园园罗洪盛张干伟林树东
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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