Polyvinylidene fluoride micropore diaphragm

A polyvinylidene fluoride and microporous diaphragm technology, applied in the field of lithium-ion batteries, can solve the problems of using a large amount of solvents, unfavorable ion passage, environmental pollution, etc., and achieve the effect of avoiding structural collapse

Inactive Publication Date: 2013-11-20
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of the immersion precipitation method is that it is difficult to obtain a membrane with a symmetrical structure, and finger-shaped holes are prone to appear, which is not conducive to the contact between the separator and the electrode.
In recent years, the therma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] The technical solutions of the present invention and the effects achieved are further described below through specific examples, but the following examples do not constitute a limitation to the present invention.

[0018] A polyvinylidene fluoride microporous diaphragm prepared by the following method:

[0019] (1) Put the polyvinylidene fluoride in a drying box and dry it at a constant temperature for 10 to 15 hours to remove the moisture therein, and seal the dried polyvinylidene fluoride for later use;

[0020] (2) Accurately weigh the polyvinylidene fluoride particles with an electronic balance, and add an organic solvent for dissolving polyvinylidene fluoride to prepare a casting solution with a mass concentration of 25%;

[0021] (3) After the polyvinylidene fluoride is completely dissolved and stirred evenly, seal and block the light and let it stand for a period of time to remove the residual gas in the solution; scrape the film thickness of the polyvinylidene f...

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Abstract

The invention discloses a polyvinylidene fluoride micropore diaphragm which is mainly applied to a lithium ion battery. The micropore diaphragm is prepared by a supercritical fluid phase separation method.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride microporous diaphragm, which is mainly used in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been developed rapidly due to their excellent electrical properties such as high energy density, long cycle life and high voltage. Has been widely used in mobile phones, portable computers, cameras, video cameras and other electronic products. Lithium-ion batteries are divided into liquid lithium-ion batteries and solid-state lithium-ion batteries. Solid-state lithium-ion batteries are generally called polymer lithium-ion batteries or plastic lithium-ion batteries. The electrolyte of the ion battery is not a free electrolyte, but a gel electrolyte or a solid electrolyte. Polymer electrolytes not only have high ionic conductivity, long cycle life, minimal pollution and good processing performance, but also have better safety and flexibility in shape design. They are used to re...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18C08J5/18H01M50/403H01M50/414H01M50/491
CPCY02E60/12Y02P20/54
Inventor 吴浩
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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