多硫化物
材料科学
介孔材料
钴
化学工程
吸附
电解质
碳纳米管
分离器(采油)
催化作用
纳米技术
电极
化学
有机化学
热力学
物理
物理化学
工程类
冶金
作者
Yuemin Li,Xinlong Bao,Xinwei Wang,Jianxun Zhao,Peng Chen,Heng Liu,Huan Wang,Lianshan Sun,Wanqiang Liu
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-10-09
卷期号:6 (20): 18780-18789
被引量:1
标识
DOI:10.1021/acsanm.3c02763
摘要
The shuttling effect of polysulfide and its sluggish reaction kinetics are the primary issues with lithium–sulfur (Li–S) batteries. In this work, an improved coimpregnation technique was used to add cobalt atoms to nitrogen-doped carbon nanotubes (Co-NCNTs) and compound them onto mesoporous silicon (SiO2). Co-NCNTs/SiO2 composites were then used as modification materials for Li–S battery separators, which were capable of physical and chemical adsorption of lithium polysulfide (LiPSs). Between silica and LiPSs, there is chemical as well as physical adsorption in the mesoporous structure of the mesoporous silica. Cobalt has a significant capacity for adsorbing LiPSs, and the cobalt site possesses catalytic activity that can promote the redox kinetics of LiPSs. NCNTs have better electrical conductivity and a dense network structure, which facilitates electrolyte penetration and Li+ transfer. As a result, Li–S batteries built with a modified separator made of Co-NCNTs/SiO2 exhibit good capacity, cycle performance, and multiplier performance, with a 1314 mA h g–1 initial capacity at 0.2 C. After 200 cycles at 1 C, the capacity is 448 mA h g–1. This work proved that Co-NCNTs/SiO2 can efficiently adsorb LiPSs and accelerate their transformation, which slows down polysulfides’ shuttle effect and speeds up their slow kinetics.
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