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Gel Polymer Electrolytes Containing Anion-Trapping Boron Moieties for Lithium-Ion Battery Applications.
ACS Applied Materials & Interfaces 2016 October 5
Gel polymer electrolytes (GPEs) based on semi-interpenetrating polymer network (IPN) structure for lithium-ion batteries were prepared by mixing boron-containing crosslinker (BC) composed of ion-conducting ethylene oxide (EO) chains, crosslinkable methacrylate group, and anion-trapping boron moiety with poly(vinylidene fluoride) (PVDF) followed by ultraviolet light-induced curing process. Various physical and electrochemical properties of the GPEs were systematically investigated by varying the EO chain length and boron content. Dimensional stability at high temperature without thermal shrinkage, if any, was observed due to the presence of thermally stable PVDF in the GPEs. GPE having 80 wt% of BC and 20 wt% of PVDF exhibited an ionic conductivity of 4.2 mS cm(-1) at 30 (o)C which is one order of magnitude larger than that of the liquid electrolyte system containing the commercial Celgard separator (0.4 mS cm(-1)) owing to the facile electrolyte uptake ability of EO chain and anion-trapping ability of boron moiety. As a result, lithium-ion battery cell prepared using the GPE with BC showed an excellent cycle performance at 1.0 C maintaining 87 % of capacity during 100 cycles.
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