Electrochemical characteristics of multi-functional polymer electrolyte based on dual-layer membrane for lithium metal polymer battery

A novel dual-layer type polymer electrolyte was prepared by impregnating the interconnected pores with an ethylene carbonate(EC)/dimethyl carbonate(DMC)/lithium hexafluorophosphate(LiPF6) solution. An incompatible layer is based on a micro-porous polyethylene(PE) and a compatible layer, based on a poly(vinylidenefluoride-co-hexafluoropropylene)(P(VdF-co-HFP)), is submicro-porous and compatible with an electrolyte solution. To enhance the ionic conductivity in the compatible layer, inorganic type Li+ single ion conductor particle based on hydrophilic silica has been synthesized. The maximum apparent ionic conductivity of the dual-layer polymer electrolyte is 7.7 × 10−3 S/cm at the ambient temperature. High rate capability of the Li/the dual-layer polymer electrolytes/Li[Ni0.15Li0.23Mn0.62]O2 cell was significantly improved as the incompatible layer thickness decreases.