多硫化物
电催化剂
化学
锂(药物)
硫黄
路易斯酸
二硫键
氧化还原
电化学
聚合
无机化学
材料科学
化学工程
催化作用
电解质
有机化学
电极
聚合物
物理化学
医学
工程类
内分泌学
生物化学
作者
Xi‐Yao Li,Shuai Feng,Meng Zhao,Zhao Chang-xin,Xiang Chen,Bo‐Quan Li,Jia‐Qi Huang,Qiang Zhang
标识
DOI:10.1002/anie.202114671
摘要
Lithium-sulfur (Li-S) batteries are deemed as future energy storage devices due to ultrahigh theoretical energy density. Cathodic polysulfide electrocatalysts have been widely investigated to promote sluggish sulfur redox kinetics. Probing the surface structure of electrocatalysts is vital to understanding the mechanism of polysulfide electrocatalysis. In this work, we for the first time identify surface gelation on disulfide electrocatalysts. Concretely, the Lewis acid sites on disulfides trigger the ring-opening polymerization of the dioxolane solvent to generate a surface gel layer, covering disulfides and reducing the electrocatalytic activity. Accordingly, a Lewis base triethylamine (TEA) is introduced as a competitive inhibitor. Consequently, Li-S batteries with disulfide electrocatalysts and TEA afford high specific capacity and improved rate responses. This work affords new insights on the actual surface structure of electrocatalysts in Li-S batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI