期刊
JOURNAL OF MEMBRANE SCIENCE
卷 429, 期 -, 页码 355-363出版社
ELSEVIER
DOI: 10.1016/j.memsci.2012.11.055
关键词
Polyethylene; Poly(ethylene-block-ethylene glycol)copolymer; Blend porous separator; Thermally-induced phase separation; Lithium ion battery
资金
- Natural Science Foundation Committee [20974094, U1134002]
Porous high density polyethylene (HDPE) membrane is an important type of separator for lithium ion batteries (LIBs). To improve the electrochemical performances of HDPE-based separators, a copolymer of poly(ethylene-block-ethylene glycol) (PE-b-PEG) was blended into porous HDPE separators via TIPS process. By measuring the composition, morphology and crystallinity, etc., the phase behavior and surface enrichment behavior of the HDPE/PE-b-PEG/LP system were studied. Compared with pure HDPE separators, surface enrichment of PE-b-PEG chains enhanced the compatibility between separators and liquid electrolyte and electrodes. The ionic conductivity of liquid electrolyte soaked blend separator was up to 1.24 x 10(-3) S cm(-1) at 25 degrees C. Furthermore, the interface resistance between separator and electrode was effectively reduced by the surface enriched polyether chains. All the results indicated that PE-b-PEG could be a promising blend substance to improve the electrochemical performances of HDPE separators prepared via TIPS process. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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