期刊
JOURNAL OF MEMBRANE SCIENCE
卷 379, 期 1-2, 页码 397-402出版社
ELSEVIER
DOI: 10.1016/j.memsci.2011.06.008
关键词
Poly(vinylidene fluoride); Poly(dimethyl siloxane); Porous separator; Lithium battery; Ion conductivity
资金
- National 973 Program [2009CB623402]
- Natural Science Foundation Committee [20974094]
- Science Foundation of Chinese University [KYJD09011]
This work explores the active separator that can be activated into gel or polymer electrolyte membrane. The active nature and easier processing property make the separator more applicable in assembling batteries. To improve the activeness of PVDF based separators, the poly(dimethylsiloxane) (PDMS) was blended into porous PVDF membrane matrix via a typical phase inversion route. By measuring the composition, morphology, ion conductivity, and so on, the work studies the influence of PDMS on structure and properties of blending separators. Compared with pure PVDF membrane having comparable porous structure, the adoption of PDMS not only decreases the crystallinity and increases the breaking elongation efficiently, but also enhances the stability of entrapped liquid electrolyte and ion conductivity. For separators with PVDF/PDMS mass ratio in 7/3, the liquid electrolyte uptake reached 250 wt% and ion conductivity of formed gel electrolyte membrane was 1.17 x 10(-3) S cm(-1), which was acceptable for high voltage lithium ion batteries. (C) 2011 Elsevier B.V. All rights reserved.
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