Nanocomposite quasi-solid-state electrolyte for high-safety lithium batteries

摘要

Rechargeable lithium batteries are attractive power sources for electronicdevices and are being aggressively developed for vehicular use. Nevertheless,problems with their safety and reliability must be solved for the large-scale useof lithium batteries in transportation and grid-storage applications. In this study,a unique hybrid solid-state electrolyte composed of an ionic liquid electrolyte（LiTFSI/Pyr14TFSI） and BaTiO3 nanosize ceramic particles was prepared withouta polymer. The electrolyte exhibited high thermal stability, a wide electrochemicalwindow, good ionic conductivity of 1.3×10-3 S-cm-1 at 30 ℃, and a remarkably highlithium-ion transference number of 0.35. The solid-state LiFePO4 cell exhibited thebest electrochemical properties among the reported solid-state batteries, along witha reasonable rate capability. Li/LiCoO2 cells prepared using this nanocompositesolid electrolyte exhibited high performance at both room temperature and a hightemperature, confirming their potential as lithium batteries with enhanced safetyand a wide range of oDerating temrperatures.