电解质
阳极
材料科学
化学工程
锂(药物)
涂层
微型多孔材料
离子电导率
电极
极化(电化学)
金属
金属锂
分离器(采油)
聚乙烯
纳米技术
化学
复合材料
冶金
物理化学
内分泌学
工程类
物理
热力学
医学
作者
Yanan Wang,Liyi Shi,Hualan Zhou,Zhuyi Wang,Rui Li,Jiefang Zhu,Zhengfu Qiu,Yin Zhao,Meihong Zhang,Shuai Yuan
标识
DOI:10.1016/j.electacta.2017.10.120
摘要
Poor stability of lithium metal anodes in liquid electrolytes hinders its practical application in rechargeable batteries with very high energy density. Herein, we present an approach to tackle the intrinsic problems of Li metal anodes from the standpoint of separators. By a facile and versatile method based on mussel-inspired surface chemistry, a hybrid polydopamine/octaammonium POSS (PDA/POSS) coating was spontaneously formed on the surface of PE separators through the self-polymerization and strong adhesion feature of dopamine. This ultrathin PDA/POSS coating endows PE separators with different surface characteristics while keeping its microporous structure almost unchanged. The altered surface characteristics influence the separator/electrolyte interaction, and lead to remarkable enhanced ionic conductivity (from 0.36 mS cm−1 to 0.45 mS cm−1) and Li+ ion transference number (from 0.37 to 0.47) of PE separators as well as the improved stability of lithium/electrolyte interface, which effectively decreases the electrode polarization and suppresses the lithium dendrites formation, contributing to superior C-rates capability and cycling performance of cells.
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