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Composite ceramic membrane for lithium ion battery

A technology of lithium-ion batteries and composite ceramics, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., which can solve the problem of reducing the charge and discharge current, hindering the migration of Li ions in the electrolyte solution, and hindering the lithium Ion battery applications and other issues, to achieve the effect of increasing charge and discharge current, improving lithium ion migration ability, and excellent insulation

Inactive Publication Date: 2017-05-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However the coated Al 2 o 3 The coating will hinder the migration of Li ions in the electrolyte solution, resulting in a decrease in charge and discharge current, which seriously hinders the application of lithium-ion batteries in the field of power batteries

Method used

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  • Composite ceramic membrane for lithium ion battery
  • Composite ceramic membrane for lithium ion battery
  • Composite ceramic membrane for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Calculated by weight, get fifteen parts of LISION, 0.3 parts of ammonium polycarboxylate, mix with 84.7 parts of water, and ball mill on a ball mill for 12 hours at a speed of 2000 rpm to prepare LISICON coating solution;

[0024] (2) Take 50 parts of alumina superfine powder, add 2 parts of pyrrolidone and 0.1 part of polyoxyethylene ether, and stir at high speed to obtain an alumina coating solution;

[0025] (3) According to the weight ratio of 1:1, take the LISICON coating solution and alumina, add it into the mixer and stir at high speed to obtain a mixed coating slurry.

[0026] (4) Coat the mixed coating slurry on the surface of a 15-micron PE battery separator by scrape coating, and dry it at 80 degrees to obtain a single-sided coated LISICON&Al2O3 / PE separator, an inorganic layer (including LISICON and Al2O3) The thicknesses are 1.5 microns, 2.5 microns, and 4.0 microns, respectively.

[0027] Then, the separators with thickness ratios of 1.5:15, 2.5:15, a...

Embodiment 2

[0031] (1) Calculated by weight, take ten parts of LISION, 0.5 parts of ammonium polycarboxylate, mix with 89.5 parts of water, and ball mill on a ball mill for 12 hours at a speed of 2000 rpm to prepare LISICON coating solution;

[0032] (2) Take 50 parts of alumina superfine powder, add 2.5 parts of pyrrolidone and 0.2 parts of polyoxyethylene ether, and stir at high speed to obtain an alumina coating solution;

[0033] (3) According to the weight ratio of 2:1, take the LISICON coating solution and the alumina coating solution, add them into the mixer and stir at high speed to obtain a mixed coating slurry.

[0034] (4) Coat the mixed coating slurry on the surface of 15 micron PP battery separator by scrape coating method, and dry it at 100 degrees to obtain LISICON&Al2O3 / PP separator coated on one side, inorganic layer (including LISICON and Al2O3) The thicknesses are 1.5 microns, 2.5 microns, and 4.0 microns, respectively.

[0035] Then, the separators with thickness rati...

Embodiment 3

[0039] (1) Calculated by weight, take 20 parts of Li-NASICON, 0.5 parts of ammonium polycarboxylate, mix with 79.5 parts of water, and ball mill on a ball mill for 24 hours at a speed of 2000 rpm to obtain Li-NASICON coated covering liquid;

[0040] (2) Take 50 parts of alumina superfine powder, add 5 parts of pyrrolidone and 0.5 part of polyoxyethylene ether, and stir at high speed to obtain an alumina coating solution;

[0041] (3) According to the weight ratio of 1:1, take the Li-NASICON coating liquid and alumina, add it into the mixer and stir at high speed to obtain a mixed coating slurry.

[0042] (4) The mixed coating slurry is coated on the surface of the PE battery separator by the scraper coating method, and dried at 90 degrees to obtain a single-sided coated Li-NASICON&Al2O3 / PE separator, an inorganic layer (containing Li-NASICON and Al2O3 ) thicknesses are 1.5 microns, 2.5 microns, and 4.0 microns, respectively.

[0043] Then, the separators with thickness ratio...

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Abstract

The invention relates to a composite ceramic membrane for a lithium ion battery. The composite ceramic membrane is characterized in that ball milling is performed on a lithium ion conductor compound material to form powder with the diameter of 0.5-5 micrometers; the powder is added to a mixed solution consisting of superfine Al2O3, a wetting agent, a binding agent and a solvent to obtain coating slurry; and a base membrane is coated with the slurry by a knife coating method on a coating machine to obtain the composite membrane for the lithium ion battery. The composite membrane keeps the advantages of Al2O3 coated PP (propene polymer) and PE (poly ethylene) membrane materials, namely excellent insulativity, chemical stability, high void ratio, tensile strength and puncture strength, so that the lithium ion migration ability of the membrane for the battery can be effectively improved. Compared with the membrane without the lithium ion conductor material, the prepared composite membrane ensures charging and discharging capacity, and obviously improves charging and discharging current.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragms, in particular to a composite ceramic diaphragm for lithium-ion batteries. Background technique [0002] At present, lithium-ion battery separator materials are mainly polyolefin compounds such as polyethylene and polypropylene, and their properties such as acid and alkali resistance and heat resistance can basically meet the safety requirements of consumer electronics batteries. However, with the rapid development of lithium-ion power battery technology and technology, pure polyolefin materials have been difficult to meet their safety requirements. During the high-current charging process, lithium dendrites are easily precipitated on the surface of the graphite cathode, which will cause a short circuit after piercing the diaphragm, and even a battery explosion in severe cases. In order to prevent lithium dendrites from damaging the battery separator, a layer of Al is generally coate...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/40H01M50/409Y02E60/10
Inventor 黄现礼何建平王涛龚浩宋尚军白耀宗刘杲珺董浩宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS