摘要
Solid-state batteries have been considered as a good choice for substituting traditional batteries with liquid electrolytes because of their high energy density and safe property.However,a little amount of flammable non-aqueous liquid electrolyte or polymer electrolyte is usually required to improve the interfacial contact,which is adverse to safety.Here,a nonflammable gel is prepared by hydrogen-bond interaction and applied as an interfacial layer to improve the performance of solid-state batteries.The prepared multilayer hybrid electrolyte(MHE)composed of gel and CPE shows a wide electrochemical window(5.3 V vs Li/Li+),high ionic transference number(0.57),and ionic conductivity(7.18×10^(−4) S cm^(−1))at room temperature.Thus,the assembled Li symmetric cell with MHE can cycle over 650 h at 0.5 mA cm^(−2) with a lower overpotential of~61 mV.The LiFePO_(4)|MHE|Li cell exhibits a higher discharge capacity of 107.8 mAh g−1 even cycled at 5 C.It also shows superior capacity retention of 96.4%after 1000 cycles at 0.5 C.This work provides a promising strategy for designing high-performance solid-state batteries.
基金
The authors acknowledge the financial support of China University of Mining&Technology(Beijing),Beijing National Laboratory for Condensed Matter Physics
the National Natural Science Founda-tion of China(Nos.51672029 and 51372271).
