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High ionic transfer of a hyperbranched-network gel copolymer electrolyte for potential electric vehicle (EV) application

2009; Elsevier BV; Volume: 54; Issue: 14 Linguagem: Inglês

10.1016/j.electacta.2009.01.072

1873-3859

Fu‐Ming Wang, Hung‐Chun Wu, Chin-Shu Cheng, Cheng‐Liang Huang, Chang-Rung Yang,

Fuel Cells and Related Materials

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.