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Lithium battery separator and preparation method and application thereof

A separator and lithium battery technology, applied in the field of electrochemistry, can solve the problem that the airtightness and strength electrochemical performance of cellulose paper cannot meet the separator materials for secondary batteries, etc.

Inactive Publication Date: 2017-12-05
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the airtightness, strength and electrochemical properties of cellulose paper prepared by conventional papermaking processes cannot meet the requirements of separator materials for secondary batteries.

Method used

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  • Lithium battery separator and preparation method and application thereof

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preparation example Construction

[0042] The preparation method of the separator provided by the invention comprises the following steps:

[0043] In the first step, the cellulose slurry, inorganic particles, binder and dispersion liquid are mixed to obtain a mixture;

[0044] In the second step, the mixture is made into paper to obtain a wet separator;

[0045] The third step is to remove moisture from the wet separator and then dry to obtain the separator provided by the present invention.

[0046]In the above-mentioned first step, the cellulose slurry is to soak at least one of cellulose acetate, cellulose nitrate, wood pulp, cotton pulp, hemp pulp, bamboo pulp and their composites in the dispersion Limited to 12-36 hours, preferably 20-30 hours) after high-speed grinding and beating. The speed of so-called high-speed grinding is 500-2000 rpm, preferably 1000-1500 rpm. The wood pulp, cotton pulp, hemp pulp or bamboo pulp can be obtained by conventional methods in the art, such as but not limited to chemi...

Embodiment 1

[0080] Preparation of separator

[0081] Add 1 liter of deionized water to 20g of bamboo pulp, after soaking, grind at a high speed and beating to make a hardwood plant fiber slurry with a concentration of 5wt%, the fiber cross-sectional diameter is 0.8 micron, and 2 grams of particle diameter is 500nm of carbon dioxide Disperse silicon in 100ml of water, add 0.2g of epoxy resin, and fully mix with cellulose slurry, make paper through a semi-automatic paper machine, squeeze the wet paper sheet with a press roller, remove excess water, and dry at 85°C , made of cellulose composite non-woven membrane.

Embodiment 2

[0083] Preparation of separator

[0084] Add 1 liter of deionized water to 20 g of cellulose acetate, after soaking, high-speed grinding and beating to make a cellulose acetate slurry with a concentration of 3 wt%, the cross-sectional diameter of the fiber is 0.6 micron, and 2 grams of trioxide Dialuminum is dispersed in 100 ml of water, 0.2 g of melamine formaldehyde resin is added, and fully mixed with cellulose slurry, paper is made by a semi-automatic paper machine, and the wet paper sheet is squeezed with a press roller to remove excess water. Dry at 85°C to make a cellulose composite nonwoven membrane.

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Abstract

The invention discloses a lithium battery separator and a preparation method and application thereof. Cellulose and inorganic matter particles are contained in raw materials of the separator, wherein the inorganic matter particles are selected from more than one of silicon dioxide, aluminum oxide, boehmite, titanium oxide, zirconium oxide, tin oxide, magnesium oxide and silicon carbide.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a composite cellulose / inorganic particle non-woven isolation membrane, a preparation method and application thereof. Background technique [0002] At present, the lithium-ion battery separator material used on a large scale is polyolefin separator. Although polyolefin has high mechanical strength and excellent electrochemical stability, its disadvantages are also very obvious: poor electrolyte wettability and poor thermal stability. Poor electrolyte wettability will affect the rate performance and long-term cycle performance of lithium batteries. Poor thermal stability will affect the safety performance of the battery. [0003] Cellulose is an abundant natural polymer material in nature, which has good heat resistance and chemical solvent resistance. The paper industry first mixes plant fibers with chemicals, cooks, beats, disperses the cellulose in water, and adds a large amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M2/14H01M2/16H01M50/403H01M50/431H01M50/491
CPCH01M10/0525H01M50/44H01M50/403Y02E60/10
Inventor 程跃邓洪贵王丽华何方波王伟强
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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