氧化还原
多硫化物
法拉第效率
锂(药物)
溶解
硫黄
电解质
动力学
化学
纳米技术
材料科学
化学工程
无机化学
电极
有机化学
物理化学
内分泌学
工程类
物理
医学
量子力学
作者
Cheng Jiang,Lulu Li,Qingqing Jia,Mi Tang,Kebin Fan,Yuan Chen,Chenyang Zhang,Minglei Mao,Jing Ma,Wenping Hu,Chengliang Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-05-23
卷期号:16 (6): 9163-9171
被引量:10
标识
DOI:10.1021/acsnano.2c01390
摘要
Li-S batteries have been regarded as one of the most promising alternatives of the next-generation Li batteries. However, the dissolution and shuttling of lithium polysulfides lead to low cycle stability and low Coulombic efficiency, which intensively hinder the practical application of Li-S batteries. Herein, we propose a strategy to simultaneously promote the redox kinetics and inhibit the shuttle of lithium polysulfides, through in situ synthesis of insoluble organopolysulfides by adding a special additive. Attractively, the thus-formed insoluble organopolysulfides in the form of nanoparticle aggregates are also capable of adsorbing unconverted lithium polysulfides and hence effectively spatially suppress the shuttle effect. Furthermore, the organopolysulfides served as active redox mediators, showing faster redox kinetics of S chemistry than that of lithium polysulfides. As a result, the Li-S batteries showed impressive capacity, improved rate performance, and long cycling stability even under lean-electrolyte and high sulfur loading conditions.
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