电解质
材料科学
电化学窗口
离子电导率
聚合物
甲基丙烯酸酯
电化学
乙二醇
高分子化学
化学工程
原子转移自由基聚合
锂(药物)
热稳定性
聚合
电极
复合材料
化学
物理化学
内分泌学
工程类
医学
作者
Ailian Wang,Hengyong Xu,Qian Zhou,Xu Liu,Zhengyao Li,Rui Gao,Na Wu,Yu‐Guo Guo,Huayi Li,Liaoyun Zhang
标识
DOI:10.1016/j.electacta.2016.07.003
摘要
A new hyperbranched multi-arm star polymer with hyperbranched polystyrene (HBPS) as core and polymethyl methacrylate-block-poly(ethylene glycol) methyl ether methacrylate(PMMA-b-PPEGMA) as arms was firstly synthesized by atom transfer radical polymerization. The obtained hyperbranched multi-arm star polymer (HBPS-(PMMA-b-PPEGMA)x) exhibited good thermal stability with a thermal decomposition temperature of 372 °C. The transparent, free-standing, flexible polymer electrolyte film of the blending of HBPS-(PMMA-b-PPEGMA)x and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) was successfully fabricated by a solution casting method. The ionic conductivity of the hyperbranched star polymer electrolyte with a molar ratio of [EO]/[Li] of 30 could reach 8.3 × 10−5 S cm−1 at 30 °C (with the content of PPEGMA of 83.7%), and 2.0 × 10−4 S cm−1 at 80 °C (with the content of PPEGMA of 51.6%). The effect of the concentration of lithium salts on ionic conductivity was also investigated. The obtained all-solid-state polymer electrolyte possessed a wide electrochemical stability window of 4.7 V (vs. Li+/Li), and a lithium-ion transference number (tLi+) up to 0.31. The interfacial impedance of the fabricated Li│polymer electrolyte│Li symmetric cell based on hyperbranched star multi-arm polymer electrolyte exhibited good interfacial compatibility between all-solid-state polymer electrolyte and electrodes. The excellent properties of the hyperbranched star polymer electrolyte made it attractive as solid-state polymer electrolyte for lithium-ion batteries.
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