Polymeric Gel Electrolyte Based on P(VdF-HFP) for Polyacene Anode

Polymeric gel electrolytes have been prepared by a thermal casting method, which consist of poly(vinylidene fluoride-co-hexafluoropropylene) [P(VdF-HFP)] as a host polymer, propylene carbonate (PC) or a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC) as a plasticizer, and LiX (X = ClO4 or (C2F5SO2)2N) as a carrier salt. The ionic conductivity and the mechanical properties of the polymeric gel electrolyte were varied with the combination of the lithium salt and the plasticizer solvent. The electrode performance of polyacene (PAS) in the gel electrolyte was briefly examined to discuss the applicability of the gel electrolyte to lithium ion battery systems. A half cell assembled with the gel film containing 1.0 mol dm−3 Li(C2F5SO2)2N/(EC + DEC) showed discharge capacity of about 600 Ah kg−1 (with respect to mass of PAS), which was equivalent to that observed for PAS in conventional liquid electrolytes.