Li6.4la3zr1.4ta0.6o12 Enhanced Pvdf-Hfp/Pes Based Composite Electrolyte with Excellent Wide Temperature Characteristic Performances for Quasi-Solid State Batteries

Solid state lithium-ion batteries with the characteristics of safety and high energy density are considered as one of the promising next generation energy storage devices. However, solid-state lithium-ion batteries face the challenge of performance degradation under wide temperature range conditions. Herein, a solid electrolyte with an inorganic/organic composite structure is proposed to achieve excellent solid-state lithium-ion batteries with wide temperature stability. The polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP) and polyethersulfone(PES) dual-matrix composite polymer electrolyte(DMCPE) via a high efficient polymerization was introduced. The flexible ceramic-polymer composite solid electrolyte(C-PCSE) membrane with Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) and DMCPE was prepared by solution casting method. The C-PCSEM achieved an excellent ionic conductivity (3.81×10 -4 , 3.98×10 -4 , 4.59×10 -4 and 4.84×10 -4 S⋅cm -1 ) at 20°C, 30°C, 40°C and 50°C, respectively. Under the test conditions of 0.2C rate, the LiFePO 4 /C-PCSE/Li batteries using this ceramic-polymer composite solid electrolyte membrane delivered stable charge/discharge profiles, considerable rate capability, and excellent cycling performance at 30°C. After 300 cycles, the capacity decay rate per cycle of batteries is 0.18%, and coulombic efficiency is 99.34%. This work provides an effective strategy for the design and preparation of the solid state lithium-ion batteries.