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Lithium ion battery composite diaphragm and preparation method thereof

A lithium-ion battery and composite diaphragm technology, which is applied in the field of battery diaphragm manufacturing, can solve the problems of large pores in polyester fiber non-woven fabrics and increase the ionic impedance of the diaphragm, and achieve energy saving for refining, lower ionic impedance, and small pore size. Effect

Pending Publication Date: 2022-07-29
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent No. CN108075090A proposes to use polyolefin microporous membrane and polyester fiber non-woven fabric to prepare composite diaphragm, which improves the heat resistance of the diaphragm. Compounding requires the use of more ceramic particles and binders, which will greatly increase the ionic impedance of the diaphragm

Method used

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  • Lithium ion battery composite diaphragm and preparation method thereof
  • Lithium ion battery composite diaphragm and preparation method thereof
  • Lithium ion battery composite diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A lithium-ion battery composite separator is prepared by the following method:

[0034] (1) Control the Tencel chopped fiber (length 4mm, diameter 12μm) at a concentration of 4%, use three disc refiner refining equipment for refining treatment, and the refining power is 180kw to obtain a beating degree of 40°SR. Slurry 1;

[0035] (2) Dilute the concentration of slurry 1 to 0.03% for screening treatment, and pass through three screening machines in turn. The screen meshes of the three screening machines are 100 mesh, 200 mesh and 300 mesh in turn, and the screen meshes of the three screening machines are intercepted. The slurry was mixed together to obtain slurry 2; then the slurry 2 was diluted to a concentration of 20%, treated with three disc refiners, and the refining power was 180kw to obtain slurry 3 with a beating degree of 70°SR; then Mixing slurry 3 and slurry 1 to form a closed sieving-refining circulation system, until all the slurry passes through a 300-mes...

Embodiment 2

[0040] A lithium-ion battery composite separator is prepared by the following method:

[0041] (1) Control the Tencel chopped fiber (length 4mm, diameter 12μm) at a concentration of 4%, use three disc refiner refining equipment for refining treatment, and the refining power is 180kw to obtain a beating degree of 40°SR. Slurry 1;

[0042] (2) Dilute the concentration of slurry 1 to 0.03% for screening treatment, and pass through three screening machines in turn. The screens of the three screening machines are 100 meshes, 200 meshes and 300 meshes in turn, and the screen meshes of the three screening machines are intercepted. The slurries were mixed together to obtain Slurry 2; then the Slurry 2 was diluted to a concentration of 20%, treated with three disc refiners, and the refining power was 180kw to obtain Slurry 3 with a beating degree of 70°SR; then Mix slurry 3 and slurry 1 to form a closed sieving-refining circulation system, until all the slurry passes through a 300-mes...

Embodiment 3

[0047] A lithium-ion battery composite separator is prepared by the following method:

[0048] (1) Control the Tencel chopped fiber (length 4mm, diameter 12μm) at a concentration of 4%, use three disc refiner refining equipment for refining treatment, and the refining power is 180kw to obtain a beating degree of 40°SR. Slurry 1;

[0049] (2) Dilute the concentration of slurry 1 to 0.03% for screening treatment, and pass through three screening machines in turn. The screen meshes of the three screening machines are 100 mesh, 200 mesh and 300 mesh in turn, and the screen meshes of the three screening machines are intercepted. The slurry was mixed together to obtain slurry 2; then the slurry 2 was diluted to a concentration of 20%, treated with three disc refiners, and the refining power was 180kw to obtain slurry 3 with a beating degree of 70°SR; then Mix slurry 3 and slurry 1 to form a closed sieving-refining circulation system, until all the slurry passes through a 300-mesh s...

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Abstract

The invention provides a preparation method of a lithium ion battery composite diaphragm, which comprises the following steps: S1, grinding tencel chopped fibers by using grinding equipment to obtain slurry 1; s2, the pulp 1 passes through a screening-pulp grinding circulation system, and tencel fibrillated fibers with the maximum diameter smaller than 2.5 micrometers are obtained through screening; s3, polyester fibers, tencel fibrillated fibers and a PAE auxiliary agent are mixed uniformly and then fed into a fourdrinier to be dewatered and formed to obtain wet paper sheets, and the wet paper sheets are squeezed and dried in a Yankee cylinder to obtain dry paper sheets; s4, carrying out soft calendering treatment on the obtained dry paper sheet to obtain superfine fiber paper; s5, superfine fiber paper is atomized and wetted through water vapor and then compounded with the polyolefin microporous membrane through rolling, and then the compounded membrane is obtained after the compounded membrane and the polyolefin microporous membrane are fed into a hot air drying box to be dried. The composite diaphragm prepared by the method has excellent heat resistance and isolation performance, is formed by atomizing and wetting water vapor and then rolling and compounding, does not need to use a binder, and can reduce the ion impedance and thermal shrinkage rate of the diaphragm.

Description

technical field [0001] The invention relates to the technical field of battery diaphragm manufacturing, in particular to a lithium ion battery composite diaphragm and a preparation method thereof. Background technique [0002] Due to its high energy density and wide temperature range, lithium-ion batteries are widely used in consumer electronics, electric vehicles, energy storage power stations, and 5G base stations. However, with the frequent occurrence of spontaneous combustion accidents in recent years, the safety of battery products has become more and more important. Diaphragm breakage is the direct cause of battery thermal runaway. Polyolefin microporous membranes have excellent mechanical properties, chemical stability and relatively uniform pore structure, and are currently the mainstream membranes in the market. However, the polyolefin microporous membrane has a low heat resistance temperature, and generates more heat in the case of high current charge-discharge o...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/44H01M50/403H01M50/417H01M50/491H01M50/497H01M10/0525D21H13/02D21H13/24D21D1/20D21D5/02
CPCH01M50/449H01M50/44H01M50/417H01M50/491H01M50/497H01M50/403H01M10/0525D21H13/02D21H13/24D21D1/20D21D5/02
Inventor 黄晶晶汪洋云娜曾林浩黄志环翁心慧高海彬刘华涛吴佳曼
Owner GUANGDONG IND TECHN COLLEGE
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