High ionic transfer of a hyperbranched-network gel copolymer electrolyte for potential electric vehicle (EV) application |
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Authors: | Fu-Ming Wang Hung-Chun Wu Cheng-Liang Huang |
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Affiliation: | a Material and Chemical Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan b Department of Chemical Engineering, National Tsing Hua University, 101 Section 2, Kuang Fu Road, Hsinchu 300, Taiwan |
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Abstract: | Hyperbranched network-based gel copolymer electrolytes are synthesized by in situ free radical polymerization. This research is separated into two parts: the first is an investigation of modified bismaleimide oligomer (MBMI) as a free volume additive, and the second investigates the salt concentration effect on high power application. A polymer electrolyte with MBMI additive provided more free volume space, and the ionic conductivity of gel copolymer electrolytes was measured as a function of the salt concentration of lithium hexafluorophosphate (LiPF6). The highest ionic conductivity and the lowest activation energy of hyperbranched-network gel copolymer electrolytes were determined to be 7.72 × 10−3 S/cm at 23 °C and 5.41 kJ/mol, respectively. Furthermore, the MBMI additive and the optimal concentration of lithium salt increased the free space for carrier ions and contributed to increasing capacity and working voltage at a high rate discharge (8C). The reliability and cycling ability of lithium polymer batteries are as good as lithium ion batteries for potential electric vehicle (EV) application. |
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Keywords: | Gel polymer electrolyte Lithium polymer batteries In situ polymerization Hyperbranched EV Free volume |
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