Star Brush Block Copolymer Electrolytes with High Ambient-Temperature Ionic Conductivity for Quasi-Solid-State Lithium Batteries

作者：Tianyun Guan, Sijia Qian, Yakun Guo, Fangyi Cheng, Wangqing Zhang, Jun Chen · 发表于：ACS Materials Letters · 年份：2019 · DOI：10.1021/acsmaterialslett.9b00423 · 被引用次数：42 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

We report high-performance star brush block copolymer electrolytes (SBBCEs) composed of 2-arm star polymer of [poly[poly(ethylene glycol) methyl ether acrylate]- b -polystyrene] 2 . The physically crosslinked structure endows SBBCEs with excellent thermal stability and considerable mechanical strength, high ionic conductivity of 2.1 × 10 –4 S cm –1 at 28 °C, wide electrochemical stability window up to 5.6 V, and good interfacial compatibility with lithium anode. Assembled LiFePO 4 |SBBCE|Li and Ni-rich LiNi 0.89 Co 0.09 Mg 0.02 O 2 |SBBCE|Li cells deliver superior ambient-temperature cycling performance with high reversible capacities, high Coulombic efficiency, and outstanding cyclic stability at considerable rate of 0.5 C. This proposed idea of employing physically crosslinked structure of brush block copolymer without any chemical crosslinker may broaden a new way to design high-performance polymer electrolytes.