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Preparation method of aramid fiber coated lithium battery diaphragm

A lithium battery separator and aramid technology, which is applied in the field of preparation of aramid-coated lithium battery separator, can solve the problems of battery explosion, battery positive and negative short circuit, inability to effectively solve high temperature short circuit, etc., and achieves improved quality and good heat resistance. performance, improve overall performance

Inactive Publication Date: 2019-10-29
高芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Separator is the key core material to block the short circuit of the positive and negative electrodes of lithium-ion batteries. The existing preparation technology of separator materials is mainly based on wet process, and the main materials are polyolefin materials such as polyethylene and polypropylene. Polymer organic films are easily Combustion occurs, causing the positive and negative electrodes of the battery to short circuit, thereby causing serious safety accidents such as battery explosion. The existing technical solution is to apply a certain thickness of inorganic coating on the surface of the organic separator to improve the temperature resistance of the separator.
With the continuous improvement of battery energy density, the requirements for the thickness and strength of battery separators are getting higher and higher. Conventional organic separators or inorganic coatings on the surface of organic separators cannot effectively solve the problem of high temperature short circuit. Therefore, the development of Ultra-thin, high-temperature-resistant diaphragm material is an urgent need for the development of lithium-ion battery diaphragm material technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of aramid fiber coating lithium battery diaphragm, comprises the following steps:

[0024] Step 1, mixing the high temperature resistant adhesive with aramid fiber and pore forming agent to form a mixed suspending emulsion;

[0025] Step 2, spraying the mixed suspoemulsion obtained in step 1 on the surface of a conventional polyolefin diaphragm by spraying;

[0026] Step 3. Put the polyolefin separator sprayed in step 2 under the protection of nitrogen for low-temperature stress relief treatment to obtain the aramid-coated lithium battery separator.

[0027] The high-temperature adhesive is composed of PVDF as a film-forming substance, and alumina, zirconia, and magnesium oxide are added as fillers, and the high-temperature adhesive accounts for 5 parts by mass in the mixed suspoemulsion.

[0028] The aramid includes isophthalic acid.

[0029] The particle size of the aramid fiber is 10-nm.

[0030] The aramid fiber accounts for 80 parts ...

Embodiment 2

[0037] A kind of preparation method of aramid fiber coating lithium battery diaphragm, comprises the following steps:

[0038] Step 1, mixing the high temperature resistant adhesive with aramid fiber and pore forming agent to form a mixed suspending emulsion;

[0039] Step 2, spraying the mixed suspoemulsion obtained in step 1 on the surface of a conventional polyolefin diaphragm by spraying;

[0040] Step 3. Put the polyolefin separator sprayed in step 2 under the protection of nitrogen for low-temperature stress relief treatment to obtain the aramid-coated lithium battery separator.

[0041] The high-temperature adhesive is composed of PVDF as a film-forming substance, and alumina, zirconia, and magnesium oxide are added as fillers, and the high-temperature adhesive accounts for 10 parts by mass in the mixed suspoemulsion.

[0042] The aramid fiber includes m-phenylenediamine.

[0043] The particle size of the aramid fiber is 30nm.

[0044] The aramid fibers in the mixed ...

Embodiment 3

[0051] A kind of preparation method of aramid fiber coating lithium battery diaphragm, comprises the following steps:

[0052] Step 1, mixing the high temperature resistant adhesive with aramid fiber and pore forming agent to form a mixed suspending emulsion;

[0053] Step 2, spraying the mixed suspoemulsion obtained in step 1 on the surface of a conventional polyolefin diaphragm by spraying;

[0054] Step 3. Put the polyolefin separator sprayed in step 2 under the protection of nitrogen for low-temperature stress relief treatment to obtain the aramid-coated lithium battery separator.

[0055] The high-temperature adhesive is composed of PVDF as a film-forming substance, and alumina, zirconia, and magnesium oxide are added as fillers. The high-temperature adhesive accounts for 15 parts by mass in the mixed suspoemulsion.

[0056] The aramid fibers include isophthalic acid and m-phenylenediamine.

[0057] The particle size of the aramid fiber is 50nm.

[0058] The aramid fib...

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Abstract

The invention discloses a preparation method of an aramid fiber coated lithium battery diaphragm, belonging to the technical field of lithium batteries. The preparation method of the aramid fiber coated lithium battery diaphragm comprises the following steps of: the step 1, mixing a high-temperature-resistant adhesive with aramid fiber and a pore-forming agent to form a mixed suspension emulsion;the step 2, spraying the mixed suspension emulsion obtained in the step 1 on the surface of a conventional polyolefin diaphragm in a spraying manner; and the step 3, placing the polyolefin diaphragm sprayed in the step 2 under the protection of nitrogen for the low-temperature stress relief treatment to obtain the aramid fiber coated lithium battery diaphragm. Compared with the prior art, the aramid fiber coating diaphragm prepared by the invention has the better heat resistance, stability, electrical insulation and flame retardant property on the whole.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a preparation method of an aramid-coated lithium battery diaphragm. Background technique [0002] Separator is the key core material to block the short circuit of the positive and negative electrodes of lithium-ion batteries. The existing preparation technology of separator materials is mainly based on wet process, and the main materials are polyolefin materials such as polyethylene and polypropylene. Polymer organic films are easily Combustion occurs, causing the positive and negative electrodes of the battery to short circuit, thereby causing serious safety accidents such as battery explosion. The existing technical solution is to apply a certain thickness of inorganic coating on the surface of the organic separator to improve the temperature resistance of the separator. With the continuous improvement of battery energy density, the requirements for the thickness an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/411Y02E60/10
Inventor 高保清舒均国陈立新高芳
Owner 高芳