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Preparation method of polyvinylidene fluoride/glass fiber/silicon dioxide porous battery separator

A technology of polyvinylidene fluoride and silicon dioxide, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve problems such as lithium batteries cannot be realized, achieve excellent thermal stability and dimensional stability, improve mechanical strength, Avoid the effect of cracking

Active Publication Date: 2020-08-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is that the battery diaphragm made by the prior art cannot realize the application of the lithium battery at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0029] A preparation method of polyvinylidene fluoride / glass fiber / silicon dioxide porous battery diaphragm:

[0030] Dissolving PVDF powder in NMP solution to obtain a transparent solution with a mass concentration of 6%, adding ammonia water with a volume ratio of 2.5% to the transparent solution, and stirring evenly to obtain a casting solution;

[0031] Lay the glass fiber woven fabric on the glass plate, move it at a speed of 20mm / s, and use a scraper at 0.1mL / cm 2 The amount of casting solution evenly coated on the glass fiber woven fabric;

[0032] Transfer the glass fiber woven fabric coated with the casting solution to a tank filled with deionized water, a phase inversion process occurs, and water and NMP are exchanged to form a semi-formed diaphragm in a wet state;

[0033] The semi-formed membrane is transferred under the infrared heater and dried at a temperature of 70°C. Flip the semi-formed diaphragm after drying, with the coated side facing down and the uncoat...

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PUM

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Abstract

The invention discloses a method for preparing a polyvinylidene fluoride / glass fiber / silicon dioxide porous battery diaphragm, which is characterized in that a sandwich structure is prepared by using glass fiber woven fabric as the middle layer and polyvinylidene fluoride film as the upper / lower layer In this process, silica particles are added to the intermediate layer to prepare a battery separator with extremely high dimensional stability, thermal stability, electrolyte affinity and mechanical strength.

Description

technical field [0001] The invention relates to a preparation method of a battery separator, in particular to a preparation method of a polyvinylidene fluoride / glass fiber / silicon dioxide porous battery separator. The prepared battery separator has extremely high electrolyte affinity, size Stability, thermal stability and mechanical strength make it have excellent electrochemical performance. Background technique [0002] As the most popular energy storage system at present, lithium-ion batteries are composed of positive electrode materials, negative electrode materials, diaphragms, electrolytes and packaging materials. The diaphragm has two main functions. One is to separate the positive and negative electrode materials to prevent internal The short circuit occurs, and the second is to provide a channel for the high-speed transmission of lithium ions. [0003] Polyolefin microporous membranes are widely used in lithium-ion battery separators because of their suitable chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411H01M50/44H01M50/446
CPCH01M50/403H01M50/449Y02E60/10
Inventor 黄晨秦颖徐康丽吴海波靳向煜
Owner DONGHUA UNIV