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Modification method of grid-shaped lithium-ion battery separator with high wettability

A lithium-ion battery and wettability technology, which is applied in the field of lithium-ion battery diaphragm modification, can solve the problems of high processing equipment prices, affecting industrial use, and high raw material costs, and achieves improved electrophilicity, convenient operation, and wettability Good results

Inactive Publication Date: 2018-12-28
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing equipment prices of these methods are relatively high, the procedures are cumbersome and the cost of raw materials is also relatively high, thus affecting its large-scale industrial use

Method used

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  • Modification method of grid-shaped lithium-ion battery separator with high wettability
  • Modification method of grid-shaped lithium-ion battery separator with high wettability
  • Modification method of grid-shaped lithium-ion battery separator with high wettability

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Soak the polypropylene microporous membrane in a mixed solution of nitric acid and potassium permanganate (the mass ratio of nitric acid to potassium permanganate is 60:1, and the mass concentration of nitric acid is 98%), and place it in a room at 25°C after sealing. React in a constant temperature water bath for 12 hours, then clean it with a hydrochloric acid solution with a molar concentration of 3mol / L, use deionized water as a cleaning agent, filter it under a pressure of 0.05MPa, and then dry it naturally. After trimming, place it in a vacuum at 40°C Dry in a drying oven for 24 hours to obtain a highly wettable lithium-ion battery separator.

Embodiment 2

[0014] Soak the polypropylene microporous membrane in a mixed solution of nitric acid and potassium permanganate (the mass ratio of nitric acid to potassium permanganate is 40:1, and the mass concentration of nitric acid is 68%), and place it in a refrigerator at 20°C after sealing. React in a constant temperature water bath for 72 hours, then clean it with a hydrochloric acid solution with a molar concentration of 1mol / L, use absolute ethanol as a cleaning agent, filter it under reduced pressure at 0.08MPa, dry it naturally, and place it in a vacuum at 60°C after trimming Dry in a drying oven for 12 hours to obtain a highly wettable lithium-ion battery separator.

Embodiment 3

[0016] Soak the polypropylene microporous membrane in a mixed solution of nitric acid and potassium persulfate (the mass ratio of nitric acid to potassium persulfate is 40:1, and the mass concentration of nitric acid is 98%), seal it and place it in a constant temperature water bath at 25 °C React in medium for 12 hours, then clean it with a hydrochloric acid solution with a molar concentration of 3mol / L, use deionized water as a cleaning agent, filter it under reduced pressure at 0.05MPa, dry it naturally, and place it in a vacuum drying oven at 40°C after trimming Medium drying for 24 hours to obtain a highly wettable lithium-ion battery separator.

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Abstract

The invention discloses a method for modifying a grid-shaped lithium-ion battery diaphragm with high wettability, and belongs to the technical field of modification of the lithium-ion battery diaphragm. The key points of the technical scheme of the present invention are: soak the lithium-ion battery diaphragm in the mixed solution formed by nitric acid and potassium permanganate, seal it and place it in a constant temperature water bath at 20-60°C for 6-72h, and then use hydrogen peroxide or hydrochloric acid solution After cleaning, decompression and suction filtration, air dry naturally, trim the edges and vacuum dry at 30-60°C for 12-72 hours to obtain a highly wettable grid-shaped lithium-ion battery separator with a thickness of 25-32 μm and a porosity of 40%-70%. . The highly wettable lithium-ion battery diaphragm prepared by the invention has uniform pore size, good wettability and high ion conductivity, which improves the hydrophilicity and electrophilicity of the lithium-ion battery diaphragm, and also improves the charge-discharge capacity of the lithium-ion battery , the prepared highly wettable lithium-ion battery separator is resistant to electrolyte corrosion, has a simple process, strong stability and is easy for industrial application.

Description

technical field [0001] The invention belongs to the technical field of modification of lithium-ion battery diaphragms, and in particular relates to a method for modifying grid-like lithium-ion battery diaphragms with high wettability. Background technique [0002] Lithium-ion batteries are widely used in digital products, electric vehicles and electric vehicles because of their high energy density, high cell voltage, good rate performance, small self-discharge and environmental protection. Most of the separator materials for lithium-ion batteries are prepared by unidirectional or bidirectional stretching of polyolefin materials. Since most of the materials used are polyolefin materials, which are non-polar, their wettability to water and electrolyte is poor, which seriously affects their liquid absorption rate, liquid retention rate and ionic conductivity of the electrolyte. The chemical properties also affect the further modification of the membrane surface. Therefore, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/489H01M50/497
CPCH01M50/403H01M50/411Y02E60/10
Inventor 李苞王新博代冬梅李永君李凡
Owner HENAN NORMAL UNIV
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