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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Preparation of Poly (Dimethylsiloxane) Graft (Poly(Propylene Oxide)-Block-Poly (Ethylene Oxide) Modified PVDF Separator and Its Use in Lithium Ion Batteries
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 1570-1575)
Author(s): Hao Li, Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization(EMC), Zhejiang
Yue-ming Chen, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou, China
Xiao-ting Ma, Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization(EMC), Zhejiang
Bao-ku Zhu, Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization(EMC), Zhejiang
Abstract: Fluoropolymer is a proper matrix material in gel electrolyte membrane for lithium batteries. To improve the property of lithium gel electrolytes, a copolymer of poly(dimethylsiloxane) graft (poly(propylene oxide)-block-poly(ethylene oxide) (PDMS-g-(PPO-PEO) was synthesized and blended into PVDF porous separators via phase inversion route. After being activated with lithium electrolyte solution, the blend separators having proper porous structure were converted into corresponding lithium gel electrolyte membranes. By measuring the stability of electrolyte, electrochemical stability and ionic conductivity etc, the effects of PDMS-g-(PPO-PEO) on properties of lithium gel electrolyte membranes were investigated and discussed. It was found that PDMS-g-(PPO-PEO) could greatly improve the performance of PVDF based separator and gel electrolyte membrane. The ionic conductivity and electrochemical stabile range of blend PVDF/ PDMS-g-(PPO-PEO) lithium gel electrolyte membrane reached as high as 2.2mS/cm and 0-5.0V (vs Li+/Li) respectively. Cells assembled with this membrane exhibited more better cycle performance.
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