High Performance Flexible Solid Electrolyte was Prepared by Combining Li6.4La3Zr2Ga0.2O12 Particles with PEO
Solid polymer electrolyte has broad application prospects due to the characteristics of good flexibili-ty,low interfacial impedance and easy processing.At present,polymer electrolytes have the problems of diffi-cult ion transport and low ion conductivity at room temperature.In this paper,the solution casting method was used to prepare polyethylene oxide(PEO)/garnet Li6.4La3Zr2Ga0.2O12(LLZGO)composite polymer electrolyte(CPE).By optimizing LLZGO particle size,it is combined with polymer electrolyte to improve the conductivity of polymer electrolyte.It is found that when the particle size of garnet electrolyte powder is 0.5 μm,the CPE prepared has the highest ion migration number of 0.343 and room temperature ion conductivity of 1.5×10-4 S·cm-1,and can cycle stably for 400 h in lithium deposition/peeling test.At 60 ℃,2.7～4.0 V,the assembled Li/CPE/LiFePO4 cells exhibit discharge specific capacity of 141 mAh·g-1 for the first time and 121.4 mAh·g-1 after 60 cycles at 0.5 C,which shows good cycle stability.By optimizing the particle size of LLZGO powder,the compos-ite polymer electrolyte provides a feasible method to improve the interfacial performance and optimize the me-chanical and electrochemical properties of CPE and develop high performance solid lithium metal batteries.
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