Synthesis of functionalized copolymer electrolytes based on polysiloxane and analysis of their conductivity |
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| Authors: | Fu-Ming Wang Chi-Chao Wan Yung-Yun Wang |
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| Affiliation: | (1) Department of Chemical Engineering, National Tsing Hua University, 101 Section 2, Kuang Fu Road, Hsinchu, 300, Taiwan;(2) Materials and Chemical Research Laboratories, Industrial Technology Research Institute, Rm. 405, Bldg. 77, 195 Sec. 4, Chung Hsing Rd., Chutung, Hsinchu, 310, Taiwan |
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| Abstract: | Functionalized siloxane-based solid polymer electrolytes were synthesized using a platinum-catalyzed silylation reaction.
The ionic conductivities of these solid polymer electrolytes were measured as a function of the concentration of lithium bis(trifluoromethylsulfonyl)imide
(LiTFSi) salt. The highest ionic conductivity and lowest activation energy of solid polymer electrolytes were observed to
be 1.15 × 10−4 S cm−1 (25 °C) and 3.85 kJ mol−1, respectively. The interface property between electrolyte and electrode and thermal stability of the polymer electrolytes
were found to enhance after they were functionalized with acrylate, and the functionalized electrolytes were observed to maintain
a glass transition temperature as low as that of other siloxane compounds. Thus, modifications involving acrylate with ethylene
oxide group substitution provide a route for carrier ions and enhance both the ionic conductivity and mechanical properties
of the siloxane structure. |
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| Keywords: | Solid polymer electrolyte Polysiloxane Interface improvement Ethylene oxide |
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