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Lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and separator technology, which is used in secondary batteries, battery pack components, and secondary battery repair/maintenance, etc., can solve hidden dangers and other problems, achieve good protection and improve safety

Inactive Publication Date: 2021-07-13
湖南博盛新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing battery separators directly use polypropylene or polyethylene as the separator. During long-term use, the metal surface of the negative electrode of the battery will contact with lithium ions to form crystals during long-term use. The length of crystals accumulated for a long time will pierce Diaphragm, most of the existing battery diaphragms directly use polypropylene or polyethylene, which cannot effectively prevent the diaphragm from being penetrated, so there are certain hidden dangers in the use process. Therefore, a lithium-ion battery diaphragm and its preparation are proposed method

Method used

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  • Lithium ion battery diaphragm and preparation method thereof

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Embodiment 1

[0023] see figure 1 with 2 , the present invention provides a technical solution: a lithium-ion battery separator, including a microporous membrane 1, the outer two walls of the microporous membrane 1 are coated with a silicon dioxide coating 2, and the outer side walls of the silicon dioxide coating 2 The aramid fiber layer 3 is bonded, and the outer wall of the aramid fiber layer 3 is coated with a ceramic coating 4 .

[0024] A preparation method of a lithium-ion battery diaphragm, comprising the following steps:

[0025] S1. Add polyethylene raw materials, pore-forming agents and additives into a heating container at 85°C and heat. After heating for 1 hour, a lamella structure is formed under tensile stress during extrusion, and a hard and elastic polymer film is obtained by heat-treating the lamella structure. , and then stretch the polymer film at a temperature of 60°C, the polymer film forms slit-like micropores, and the microporous film is obtained after heat setting...

Embodiment 2

[0037] see figure 1 with 2 , the present invention provides a technical solution: a lithium-ion battery separator, including a microporous membrane 1, the outer two walls of the microporous membrane 1 are coated with a silicon dioxide coating 2, and the outer side walls of the silicon dioxide coating 2 The aramid fiber layer 3 is bonded, and the outer wall of the aramid fiber layer 3 is coated with a ceramic coating 4 .

[0038] A preparation method of a lithium-ion battery diaphragm, comprising the following steps:

[0039] S1. Add polyethylene raw materials, pore-forming agents and additives into a heating container at 90°C and heat. After heating for 0.7h, a lamellar structure is formed under tensile stress during extrusion, and a hard and elastic polymer is obtained by heat-treating the lamellar structure. film, and then stretch the polymer film at a temperature of 35°C, the polymer film forms slit-like micropores, and the microporous film is obtained after heat setting;...

Embodiment 3

[0051] see figure 1 and 2 , the present invention provides a technical solution: a lithium-ion battery separator, including a microporous membrane 1, the outer two walls of the microporous membrane 1 are coated with a silicon dioxide coating 2, and the outer side walls of the silicon dioxide coating 2 The aramid fiber layer 3 is bonded, and the outer wall of the aramid fiber layer 3 is coated with a ceramic coating 4 .

[0052] A preparation method of a lithium-ion battery diaphragm, comprising the following steps:

[0053] S1. Add polyethylene raw materials, pore-forming agents and additives into a heating container at 90°C and heat. After heating for 0.8h, a lamella structure is formed under tensile stress during extrusion, and a hard elastic polymer is obtained by heat-treating the lamella structure. Film, and then stretch the polymer film at a temperature of 70°C, the polymer film forms slit-like micropores, and the microporous film is obtained after heat setting;

[00...

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Abstract

The invention discloses a lithium ion battery diaphragm which comprises a microporous membrane. The two walls at the outer side of the microporous membrane are both coated with silicon dioxide coatings, the outer side walls of the silicon dioxide coatings are bonded with aramid fiber layers, and the outer side walls of the aramid fiber layers are coated with ceramic coatings. The preparation method of the lithium ion battery diaphragm comprises the following steps of S1, adding a polyethylene raw material, a pore-forming agent and an additive into a heating container at the temperature of 85-110 DEG C to be heated, bonding an aramid fiber layer to the outer side wall of the silicon dioxide coating, then coating the outer side wall of the aramid fiber layer with the ceramic coating. The ceramic coating can prevent lithium crystals from penetrating through the polyethylene diaphragm of a lithium battery, and the better protection effect is achieved. The aramid fiber layer can play a role in secondary protection and can also play a role in preventing static electricity from influencing the lithium battery, so that the problem that certain hidden dangers exist in the use process due to the fact that the polyethylene diaphragm is easy to penetrate is solved, and the use safety of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery separators, in particular to a lithium-ion battery separator and a preparation method thereof. Background technique [0002] With the development of lithium-ion batteries to power fields such as electric vehicles, aerospace, large-scale instruments and meters, and energy storage, higher requirements are put forward for the comprehensive performance of batteries. The safety of lithium-ion batteries is particularly important, especially for batteries. Internal short circuit problem. The application of separator materials for batteries in the fields of lithium batteries, vanadium batteries, and lithium-sulfur batteries is becoming more and more extensive. As a result, the demand for separator materials for batteries has greatly increased. At the same time, due to the changing working environment and differences in performance requirements, special batteries The demand for diaphragm mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/44H01M50/431H01M50/434H01M50/403H01M50/414H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 张羽标叶淼
Owner 湖南博盛新能源技术有限公司
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