Enhanced Electrochemical Performance of Poly(ethylene oxide) Composite Polymer Electrolyte via Incorporating Lithiated Covalent Organic Framework
Yuan Yao, Yu Cao, Gang Li, Cheng Liu, Zhongyi Jiang, Fusheng Pan, Jie Sun
Abstract
Abstract The lithiated covalent organic framework (named TpPa-SO 3 Li), which was prepared by a mild chemical lithiation strategy, was introduced in poly(ethylene oxide) (PEO) to produce the composite polymer electrolytes (CPEs). Li-ion can transfer along the PEO chain or across the layer of TpPa-SO 3 Li within the nanochannels, resulting in a high Li-ion conductivity of 3.01 × 10 −4 S/cm at 60 °C. When the CPE with 0.75 wt.% TpPa-SO 3 Li was used in the LiFePO 4 ||Li solid-state battery, the cell delivered a stable capacity of 125 mA·h/g after 250 cycles at 0.5 C, 60 °C. In comparison, the cell using the CPE without TpPa-SO 3 Li exhibited a capacity of only 118 mA·h/g.