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A kind of preparation method of lithium-ion battery high liquid absorption diaphragm material

A technology for lithium-ion batteries and diaphragm materials, which is applied in the field of preparation of highly liquid-absorbing diaphragm materials for lithium-ion batteries, can solve problems such as backward technology and production methods, difficulty in achieving comprehensive performance of lithium-ion battery diaphragm production and preparation, and improve safety. Performance and capacity, high yield, low closed cell temperature

Active Publication Date: 2019-03-19
浙江锂盾储能材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology and production methods of lithium-ion battery separators are relatively backward, and it is difficult to realize the production and preparation of lithium-ion battery separators with excellent comprehensive performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a lithium-ion battery highly liquid-absorbing diaphragm material, comprising the following steps:

[0021] Step 1. Uniformly mix nylon powder, ethylene-vinyl acetate copolymer powder and nano-ceramic powder, melt and co-extrude, cool, and cut into pellets. The melt-co-extrusion temperature is 260°C, and the nano-ceramic powder The particle size is 10-100nm, the mixing ratio of the nylon powder, ethylene-vinyl acetate copolymer powder, and nano-ceramic powder is 85:5:10, and the nano-ceramic powder material is nano-alumina, nano-di A mixture of silicon oxide, nano-titanium dioxide and nano-calcium oxide;

[0022] Step 2, heating and extruding the pellets through a plasticizer, cooling and forming, and then corona treatment to obtain a nylon film;

[0023] Step 3, soaking the nylon membrane prepared in step 2 in an acid solution with a concentration of 3-35% for 1-5 minutes, the acid solution being a mixture of hydrochloric acid and sulfuric acid;...

Embodiment 2

[0027] A preparation method of a lithium-ion battery highly liquid-absorbing diaphragm material, comprising the following steps:

[0028] Step 1, uniformly mix nylon powder, ethylene-vinyl acetate copolymer powder and nano-ceramic powder, melt and co-extrude, cool and cut into pellets, the melting and co-extrusion temperature is 320°C, and the nano-ceramic powder The particle size is 10-100nm, the mixing ratio of the nylon powder, ethylene-vinyl acetate copolymer powder, and nano-ceramic powder is 85:13:2, and the nano-ceramic powder material is nano-alumina;

[0029] Step 2, heating and extruding the pellets through a plasticizer, cooling and forming, and then corona treatment to obtain a nylon film;

[0030] Step 3, soaking the nylon membrane prepared in step 2 in an acid solution with a concentration of 3-35% for 1-5 minutes, the acid solution being sulfuric acid;

[0031] Step 4, vacuum drying the nylon membrane treated in step 3, the vacuum drying temperature is 80°C, an...

Embodiment 3

[0034] A preparation method of a lithium-ion battery highly liquid-absorbing diaphragm material, comprising the following steps:

[0035] Step 1, uniformly mix nylon powder, ethylene-vinyl acetate copolymer powder and nano-ceramic powder, melt and co-extrude, cool and cut into pellets, the melt-co-extrusion temperature is 280°C, and the nano-ceramic powder The particle size is 10-100nm, the mixing ratio of the nylon powder, ethylene-vinyl acetate copolymer powder, and nano-ceramic powder is 85:7:8, and the nano-ceramic powder material is nano-silicon dioxide and nano-titanium dioxide;

[0036] Step 2, heating and extruding the pellets through a plasticizer, cooling and forming, and then corona treatment to obtain a nylon film;

[0037] Step 3, soaking the nylon membrane prepared in step 2 in an acid solution with a concentration of 3-35% for 1-5 minutes, the acid solution being nitric acid and phosphoric acid;

[0038] Step 4, vacuum drying the nylon membrane treated in step ...

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Abstract

The invention discloses a preparation method of a high liquid-absorbing diaphragm material for a lithium-ion battery. In the method, nylon powder, ethylene-vinyl acetate copolymer powder and nano-ceramic powder are uniformly mixed, melted and co-extruded, and then passed through Film forming, acid treatment, vacuum drying, remote hydrogen peroxide low-temperature plasma treatment and other steps are used to prepare a high liquid-absorbing diaphragm material for lithium-ion batteries. The process of the invention is simple and reasonable, and the yield is high. The diaphragm material formed by blending and blowing nylon, ethylene-vinyl acetate copolymer and nano-ceramic powder has low closed-cell temperature, high membrane rupture temperature and low high-temperature heat yield. And the characteristics of high liquid absorption rate, improve the performance of the diaphragm and the safety and capacity of the battery application.

Description

technical field [0001] The invention relates to the field of lithium ion battery diaphragm production, in particular to a preparation method of a lithium ion battery high liquid absorption diaphragm material. Background technique [0002] Lithium-ion batteries are mainly composed of five materials: positive electrode material, negative electrode material, electrolyte, separator, and outer packaging material. Among them, the diaphragm material, as one of the important components of the lithium-ion battery, has been receiving much attention. The diaphragm is a microporous film placed between the positive and negative electrodes of the battery. Its main function is to separate the positive and negative electrodes of the lithium battery to avoid short circuits, and Provide free passage for lithium ions to achieve a closed loop. In addition, the lithium-ion battery separator is a polymer functional membrane material with nano-scale micropores. It is required that it does not che...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525B82Y30/00H01M50/403
CPCH01M10/0525B82Y30/00H01M50/446H01M50/403Y02E60/10
Inventor 章结兵谢凤秀
Owner 浙江锂盾储能材料技术有限公司
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