A low cost composite quasi-solid electrolyte of LATP, TEGDME, and LiTFSI for rechargeable lithium batteries**Project supported by the National Natural Science Foundation of China (Grant Nos. 52315206 and 51502334), the Funds from the Ministry of Science and Technology of China (Grant No. 2016YFB0100100), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09010000), and the Foundation

Abstract

The composite quasi solid state electrolytes (CQSE) is firstly synthesized with quasi solid state electrolytes (QSE) and lithium-ion-conducting material Li1.4Al0.4Ti1.6(PO4)3 (LATP), and the QSE consists of [LiG4][TFSI] with fumed silica nanoparticles. Compared with LATP, CQSE greatly improves the interface conductance of solid electrolytes. In addition,it has lower liquid volume relative to QSE. Although the liquid volume fraction of CQSE is droped to 60%, its conductivity can also reach 1.39×10−4 S/cm at 20 °C. Linear sweep voltammetry (LSV) is conducted on each composite electrolyte. The results show the possibility that CQSE has superior electrochemical stability up to 5.0 V versus Li/Li+1. TG curves also show that composite electrolytes have higher thermal stability. In addition, the performance of Li/QSE/LiMn2O4 and Li/CQSE/LiMn2O4 batteries is evaluated and shows good electrochemical characteristics at 60 °C.