Polypropylene microporous diaphragm

A technology of microporous diaphragm and polypropylene, which is applied in the field of lithium-ion batteries, can solve the problems of using a large amount of solvents, difficulty in obtaining structural symmetry, poor connectivity between pores, 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 thermally induced phase separation method has been studied more. Its advantages are narrow pore size distribution, symmetrical structure, and no finger-like pores. The preparation process needs to use a large amount of solvent, which is easy to cause environmental pollution and other problems

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

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

[0018] A polypropylene microporous membrane prepared by the following method:

[0019] (1) Place the polypropylene in a drying box for constant temperature drying for 10-15 hours to remove the moisture in it, and seal the dried polypropylene for later use;

[0020] (2) Use an electronic balance to accurately weigh the polypropylene particles, and add an organic solvent that dissolves the polypropylene to form a casting solution with a mass concentration of 25%;

[0021] (3) After the polypropylene is completely dissolved and stirred evenly, seal and close the light and let it stand for a period of time to remove the remaining gas in the solution; the thickness of the scraped polypropylene solution film is 200-300μm;

[0022] (4) Set the temperature of the water ...

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Abstract

The invention discloses a polypropylene microporous diaphragm which is mainly used for a lithium ion battery. The microporous diaphragm is prepared by a supercritical fluid phase separation method.

Description

Technical field [0001] The invention relates to a polypropylene microporous diaphragm, which is mainly used for lithium ion batteries. Background technique [0002] Lithium-ion batteries have achieved rapid development due to their excellent electrical properties such as high energy density, long cycle life and high voltage. It has been widely used in the fields of electronic products such as mobile phones, portable computers, cameras, and video cameras. 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 working principle is the same as that of liquid lithium-ion batteries. The difference is polymer lithium The electrolyte of an ion battery is not a free electrolyte, but a gel electrolyte or a solid electrolyte. Polymer electrolyte not only has high ionic conductivity, long cycle life, minimal pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18C08L23/12C08J5/18H01M50/403H01M50/417H01M50/491
CPCY02E60/12Y02P20/54
Inventor 吴浩
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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