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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.

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Inventors:
HU JIALING (CN)
SHAN JUN (CN)
WU JINXIANG (CN)
HE LONG (CN)
Application Number:
PCT/CN2017/097405
Publication Date:
March 08, 2018
Filing Date:
August 14, 2017
Export Citation:
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Assignee:
BYD CO LTD (CN)
International Classes:
H01M50/403; H01M50/414; H01M50/417; H01M50/42; H01M50/423; H01M50/426; H01M50/434; H01M50/44; H01M50/449; H01M50/451; H01M50/454; H01M50/457; H01M50/491
Domestic Patent References:
WO2013115594A12013-08-08
Foreign References:
CN102832367A2012-12-19
CN104752660A2015-07-01
CN102668173A2012-09-12
US20100233523A12010-09-16
CN102891334A2013-01-23
Other References:
See also references of EP 3493297A4
Attorney, Agent or Firm:
TSINGYIHUA INTELLECTUAL PROPERTY LLC (CN)
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