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

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Star Brush Block Copolymer Electrolytes with High Ambient-Temperature Ionic Conductivity for Quasi-Solid-State Lithium Batteries
ACS Materials Letters ( IF 9.6 ) Pub Date : 2019-10-29 , DOI: 10.1021/acsmaterialslett.9b00423
Tianyun Guan ₁ , Sijia Qian ₁ , Yakun Guo ₁ , Fangyi Cheng ₁ , Wangqing Zhang _{1,

2} , Jun Chen ₃

Affiliation

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 LiFePO₄|SBBCE|Li and Ni-rich LiNi_0.89Co_0.09Mg_0.02O₂|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.

中文翻译：

具有高环境温度离子电导率的星形电刷嵌段共聚物电解质，用于准固态锂电池

我们报告了由[聚[聚（乙二醇）甲基醚丙烯酸酯] -b-聚苯乙烯] ₂的2臂星形聚合物组成的高性能星形刷嵌段共聚物电解质（SBBCE）。物理交联的结构赋予SBBCE优异的热稳定性和可观的机械强度，在28°C时具有2.1×10 ^–4 S cm ^–1的高离子电导率，高达5.6 V的宽电化学稳定性窗口，并且与锂阳极具有良好的界面相容性。组装LiFePO ₄ | SBBCE | Li和富镍LiNi _0.89 Co _0.09 Mg _0.02 O ₂| SBBCE | Li电池可在0.5 C的显着速率下提供出色的环境温度循环性能，高可逆容量，高库仑效率和出色的循环稳定性。使用刷嵌段共聚物的物理交联结构而无任何化学交联剂的这一提议构想可能会拓宽设计高性能聚合物电解质的新方法。

更新日期：2019-10-29

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