Preparation and Performance of Novel Acrylonitrile (AN)-based Copolymer Gel Electrolytes for Lithium Ion Batteries

摘要

A novel acrylonitrile (AN)-based copolymer, P (acrylonitrile (AN) - methyl methacrylate (MMA)-methoxy polyethylene glycol (350) monoacrylate (MPGA)-lithium acrylate (LiAc)) (PAMMGLiAc) gel electrolytes were prepared in this paper. The physical properties of the AN-based copolymer membranes were characterized by IR, NMR, TGA, DSC and tensile test. The electrochemical characteristics of the AN-based gel electrolytes were investigated by electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV). The results show that the gel electrolytes have high ionic conductivity over 2?0~(-3)S/cm at room temperature, good mechanical properties and a sufficient electrochemical stability with a decomposition voltage as high as 6V vs. Li. The Li/gel electrolyte/LiFePO_4 coin cells with the prepared copolymer gel electrolytes also showed a good charge/discharge performance.