新型炭材料2023，Vol.38Issue(2)：337-346,10.DOI:10.1016/S1872-5805(23)60713-9
原位化学转化法封装硫于分级微-纳炭/碳化钼用于高性能锂硫电池
Encapsulation of sulfur inside micro-nano carbon/molybdenum carbide by in-situ chemical transformation for high-performance Li-S batteries
摘要
Abstract
In lithium-sulfur (Li-S) batteries, the electrochemical properties of the sulfur cathode are determined by the sulfur host, and this controls the shuttle effect and the kinetics, two of the major problems in these batteries. We confined the S in hollow thin-wall C/Mo2C particles smaller than 7 nm across that clustered together to form micrometer-size particles. The conducting network of C/Mo2C shells facilitates lithium-ion and electron transport while acting as a barrier to the outward diffusion of polysulfides. They also improve the redox kinetics because of the catalytic conversion of polysulfides to sulfur. As a result of these features the material achieved a high reversible capacity of 1210 mAh g?1 at 0.5 C with a low capacity fade rate of 0.127％ per cycle over 300 cycles and a high rate performance (780 mAh g?1 at 3.0 C). It is expected that this work will help in the design of sulfur hosts for Li-S batteries with a high rate performance and high cycling stability.关键词
锂硫电池/C/Mo2C反应器/空心结构/催化作用/原位限域Key words
Lithium-sulfur batteries/C/Mo2C reactor/Hollow structure/Catalysts/In-situ confined分类
通用工业技术引用本文复制引用
陈新荣,郁晓菲,何斌,李文翠..原位化学转化法封装硫于分级微-纳炭/碳化钼用于高性能锂硫电池[J].新型炭材料,2023,38(2):337-346,10.基金项目
The authors are grateful to the financial support by National Natural Science Foundation of China (No.21875028).基金项目:中国国家自然科学基金项目(21875028). （No.21875028）
