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Patent Searching and Data


Title:
METHOD FOR PREPARING LITHIUM ION BATTERY SEPARATOR WITH HIGH TEMPERATURE RESISTANCE AND LOW ELECTRICAL RESISTIVITY
Document Type and Number:
WIPO Patent Application WO/2018/068745
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of battery separators, and relates to a method for preparing a lithium ion battery separator with a high temperature resistance and low electrical resistivity. The battery separator comprises a base film and a coating slurry layer coated on one or both of the end surfaces of the base film, wherein the material of the coating slurry layer is a ceramic slurry or a graphene-modified ceramic slurry, and the material of the coating slurry layer on at least one of the two end surfaces of the base film is a graphene-modified ceramic slurry. The steps for the preparation of the separator comprise preparing the graphene-modified ceramic slurry, pre-treating the base film, and coating and drying, wherein in the preparation of the graphene-modified ceramic slurry, a dispersant, a stabilizer, graphene, an aqueous acrylic latex and a sodium carboxymethylcellulose solution are sequentially added, the resulting slurry has a stable performance, and further has the advantages of ceramic slurries and graphene materials. The battery separator formed by coating the base film with the slurry has a low shrinkage rate at high temperature and a high safety, allows for a high battery charging rate, and is suitable for high-temperature operations for electromobiles, etc. and industries requiring fast-charging batteries, etc.

Inventors:
XU FENG (CN)
YUAN HAICHAO (CN)
DENG YUNFEI (CN)
MA WENXIAN (CN)
Application Number:
PCT/CN2017/105853
Publication Date:
April 19, 2018
Filing Date:
October 12, 2017
Export Citation:
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Assignee:
HEBEI GELLEC NEW ENERGY MATERIAL SCIENCE & TECH CO LTD (CN)
International Classes:
H01M10/0525; H01M50/403; H01M50/431; H01M50/434; H01M50/449; H01M50/451; H01M50/457; H01M50/491
Foreign References:
CN106299208A2017-01-04
CN104183805A2014-12-03
CN105006591A2015-10-28
CN104446515A2015-03-25
Attorney, Agent or Firm:
RUNPING & PARTNERS (CN)
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