多硫化物
电解质
硫黄
材料科学
溶解
有机硫化合物
电化学
电池(电)
氧化还原
锂(药物)
无机化学
阴极
化学工程
电极
化学
有机化学
冶金
物理化学
物理
工程类
内分泌学
功率(物理)
医学
量子力学
作者
Ke Chen,Ruopian Fang,Zan Lian,Xiaoyin Zhang,Pei Tang,Bo Li,Kuang He,Dawei Wang,Hui‐Ming Cheng,Ze Sun,Feng Li
标识
DOI:10.1016/j.ensm.2021.02.012
摘要
Lithium-sulfur (Li-S) batteries have recently emerged as a promising candidate for next-generation energy storage systems. Yet the polysulfide dissolution and shuttle issues cause severe performance degradation, hindering their practical use. Here, we report an in-situ solidification strategy for efficient polysulfide blocking via nucleophilic substitution reactions triggered by 2, 5-dichloro-1, 4-benzoquinone (DCBQ) in the electrolyte. Polysulfides could be covalently fixed by DCBQ in the form of solid organosulfur to enable effective immobilization of polysulfides within the cathode, contributing to high capacity-retention. Moreover, the benzoquinonyl groups of DCBQ were found able to accelerate the lithium-ion transport and promote the sulfur redox reaction kinetics. Consequently, the Li-S cell with DCBQ exhibited good electrochemical performances. This approach demonstrates a novel avenue for polysulfide blocking to boost Li-S battery performance.
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