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Porous polyvinylidene fluoride lithium ion battery diaphragm and preparation method thereof

A technology of polyvinylidene fluoride and lithium-ion batteries, which is applied in the direction of secondary batteries, battery pack components, separators/films/diaphragms/spacer components, etc., and can solve the problems of limiting the life of lithium batteries, reduced battery life, and poor wettability and other problems, to achieve high production efficiency, fast infiltration, and good infiltration

Inactive Publication Date: 2018-03-27
ZHEJIANG GREEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing polyolefin lithium-ion battery diaphragm electrolyte has poor wettability and poor heat resistance, especially in the working environment where the battery is exposed to high temperature for a long time, it will accelerate the aging of the film, thereby reducing the battery life. The main issue with battery life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Porous polyvinylidene fluoride lithium-ion battery separator, in parts by weight, the polyvinylidene fluoride lithium-ion battery separator includes 20-70 parts of a polyvinylidene fluoride resin, 30-80 parts of a diluent, and the polyvinylidene fluoride The resin has a molecular weight between 400,000 and 900,000, and the diluent is diphenyl carbonate, dimethylformamide, dimethylacetamide, dipropyl ketone, di-n-butyl phthalate, and benzophenone. one or a mixture of more than one of them.

[0025] The method for preparing porous polyvinylidene fluoride lithium-ion battery diaphragm, the specific steps are as follows:

[0026] Step 1: Pretreatment of raw materials: Weigh 20-70 parts of a polyvinylidene fluoride resin and 30-80 parts of a diluent by weight, and then change the physical state of the diluent to be the same as that of the polyvinylidene fluoride resin , the polyvinylidene fluoride resin has a molecular weight between 400,000 and 900,000, and the diluent is ...

Embodiment 2

[0039] Porous polyvinylidene fluoride lithium ion battery diaphragm, by weight, the polyvinylidene fluoride lithium ion battery diaphragm includes at least two or more than 20-70 parts of polyvinylidene fluoride resin, 30-80 parts of diluent, the polyvinylidene fluoride The vinylidene fluoride resin has a molecular weight between 400,000 and 900,000, and the diluent is diphenyl carbonate, dimethylformamide, dimethylacetamide, dipropyl ketone, di-n-butyl phthalate, diphenyl One or a mixture of more than one of ketones.

[0040] The method for preparing porous polyvinylidene fluoride lithium-ion battery diaphragm, the specific steps are as follows:

[0041] Step 1: Pretreatment of raw materials: Weigh at least two or more polyvinylidene fluoride resins 20-70 parts and diluent 30-80 parts by weight, and then change the physical state of the diluent into that of the polyvinylidene fluoride resin. The physical state is the same, the polyvinylidene fluoride resin has a molecular we...

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Abstract

The invention discloses a porous polyvinylidene fluoride diaphragm used for a lithium ion battery and a preparation method thereof. The porous polyvinylidene fluoride lithium ion battery diaphragm comprises the following components in parts by weight: 20-70 parts of one type of polyvinylidene fluoride resin or at least more than two of a polyvinylidene fluoride resin mixture, and 30-80 parts of adiluent. The preparation method comprises the following steps: 1) raw material pretreatment; 2) mixing; 3) granulation; 4) drying; 5) dried particles casting through a casting line for film forming; 6) transverse stretching or vertical stretching or transverse and vertical stretching on a film; and 7) extraction on the stretched film through an extractant to obtain the porous polyvinylidene fluoride lithium ion battery diaphragm. The porous polyvinylidene fluoride lithium ion battery diaphragm can resist acid-base solutions with pH values from 1 to 14, and cannot be dissolved in an organic solvent such as alcohol, aldehyde and benzene; wettability of an electrolyte is good, and thermal contraction resistance is good. The preparation method has the advantages of simple process, environmental protection, and high production efficiency.

Description

technical field [0001] The invention relates to a porous polyvinylidene fluoride lithium ion battery diaphragm and a preparation method. Background technique [0002] With the development of science and technology and the improvement of the level of intelligence in life, various smart devices and new energy vehicles have become more and more popular. Lithium-ion batteries have begun to be widely used in these fields due to their high energy density, low energy attenuation, and no memory attributes. Show your skills. As one of the core technologies of lithium-ion batteries, its separator technology is being paid more and more attention, and the traditional polyolefin lithium-ion battery separators have begun to encounter technical bottlenecks. The existing polyolefin lithium-ion battery diaphragm electrolyte has poor wettability and poor heat resistance, especially in the working environment where the battery is exposed to high temperature for a long time, it will accelerate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/489
CPCH01M10/0525H01M50/409H01M50/403Y02E60/10
Inventor 胡琴陈超吾良福徐诚赵俊华许锡均胡松林周力丰
Owner ZHEJIANG GREEN NEW MATERIALS
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