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Title:
POLYMER COMPOSITE FILM AND PREPARATION METHOD THEREFOR AND LITHIUM ION BATTERY COMPRISING THE POLYMER COMPOSITE FILM
Document Type and Number:
WIPO Patent Application WO/2018/040904
Kind Code:
A1
Abstract:
A polymer composite film and a preparation method therefor and a lithium ion battery using the polymer composite film. The polymer composite film comprises a porous base film and a heat-resistant fiber layer covering on at least one side surface of the porous base film; the material of the heat-resistant fiber layer contains a first high polymer material and a second high polymer material simultaneously; the first high polymer material is a heat-resistant high polymer material having a melting point higher than 180℃; and the second high polymer material has a melting point lower than that of the first high polymer material, and the second high polymer material, in electrolyte solution at 25℃, has an electrolyte uptake of greater than 40% with an error of ±5%. The first high polymer material and the second high polymer material are used to form the heat-resistant fiber layer, so that transport of lithium ions cannot be blocked; therefore, the ionic conductivity of the polymer composite film is maintained and performances such as the cycle life and the like of the battery are further prolonged to a certain extent.

Inventors:
HU, Jialing (No. 3009, BYD Road Pingsha, Shenzhen Guangdong 8, 518118, CN)
SHAN, Jun (No. 3009, BYD Road Pingsha, Shenzhen Guangdong 8, 518118, CN)
WU, Jinxiang (No. 3009, BYD Road Pingsha, Shenzhen Guangdong 8, 518118, CN)
HE, Long (No. 3009, BYD Road Pingsha, Shenzhen Guangdong 8, 518118, CN)
Application Number:
CN2017/097405
Publication Date:
March 08, 2018
Filing Date:
August 14, 2017
Export Citation:
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Assignee:
BYD COMPANY LIMITED (No. 3009, BYD Road Pingsha, Shenzhen Guangdong 8, 518118, CN)
International Classes:
H01M2/16
Domestic Patent References:
WO2013115594A12013-08-08
Foreign References:
CN102832367A2012-12-19
CN104752660A2015-07-01
CN102668173A2012-09-12
US20100233523A12010-09-16
CN102891334A2013-01-23
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (Room 301 Trade Building, Zhaolanyuan Tsinghua University, Qinghuayuan 4, 100084, CN)
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