Self-assembly synthesis of solid polymer electrolyte with carbonate terminated poly(ethylene glycol) matrix and its application for solid state lithium battery

Yuan, B (Yuan, Bing)^{[ 1 ]} ; Luo, GM (Luo, Guangmei)^{[ 1 ]} ; Liang, J (Liang, Jing)^{[ 2 ]} ; Cheng, FY (Cheng, Fangyi)^{[ 2 ]} ; Zhang, WQ (Zhang, Wangqing)^{[ 1,3 ]} ; Chen, J (Chen, Jun)^{[ 2 ]}

JOURNAL OF ENERGY CHEMISTRY, 2019, 38: 55-59

DOI: 10.1016/j.jechem.2019.01.004

摘要

A facile one-pot synthesis of solid polymer electrolytes (SPEs), composed of carbonate terminated poly(ethylene glycol) (CH3O-PEG-IC), poly(ethylene glycol)-block-polystyrene (PEG-b-PS) block copolymer nanoparticles containing a conductive PEG corona, fumed SiO2 and LiTFSI salt via polymerization-induced self-assembly is proposed. This method to prepare SPEs has the advantages of one-pot convenient synthesis, avoiding use of organic solvent and conveniently adding inorganic additives. CH3O-PEG-IC combines advantages of PEG and polycarbonate, the in situ synthesized PEG-b-PS nanoparticles containing a rigid polystyrene (PS) core and a PEG corona guarantee continuous lithium ion transport in the synthesized SPEs, and the fumed SiO2 optimizes the interfacial properties and improves the electrochemical stability, all of which afford SPEs a well considerable room temperature ionic conductivity of 1.73 x 10(-4)S/cm, high lithium transference number of 0.53, and wide electrochemical stability window of 5.5 V (vs. Li+/Li). By employing these SPEs, the assembled solid state cells of LiFePO4 vertical bar SPEs vertical bar Li exhibit considerable cell performance. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.