多硫化物
硫黄
材料科学
兴奋剂
催化作用
电催化剂
阴极
碳纤维
储能
无机化学
锂(药物)
化学工程
电解质
冶金
电化学
电极
有机化学
物理化学
化学
光电子学
功率(物理)
量子力学
复合数
复合材料
医学
内分泌学
工程类
物理
作者
Hang Zhao,Bingbing Tian,Chenliang Su,Ying Li
标识
DOI:10.1021/acsami.0c20446
摘要
Lithium–sulfur (Li–S) batteries are regarded as promising secondary energy storage devices for their high energy density and low cost. The electrochemical performance of Li–S batteries is mainly determined by the efficient and reversible conversion of lithium-polysulfides to Li2S when discharging and to S when charging. Herein, a catalytic strategy is proposed to accelerate the reversible conversion of S and the discharge products in Li–S batteries. This reversible transformation is achieved with active sites of single-atom iron on nitrogen- and sulfur-doped porous carbon (FeNSC). We prove that the synergy between atomically dispersed iron and doped sulfur accelerates the reversible electrochemical conversion reactions in Li–S batteries. The FeNSC/S hybrid cathode exhibits superior long-term cycling stability even at a high current density of 1C, with only 0.047% capacity decay per cycle over 1000 cycles. This study demonstrates a novel method for improving the conversion of polysulfides based on electrocatalysis strategies to ultimately obtain high-performance Li–S batteries.
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