摘要
Conductive carbon structure has been considered as a promising sulfur-hosting material as the cathode of lithium-sulfur batteries.However, the issue of polysulfide shuttling requires an additional component to help restrict and convert sulfur substances.Herein, in this work, hollow and porous carbon nanospheres(HCS) are synthesized by a template method and a high-temperature carbonization treatment. A thin layer of ZnS coating is then deposited on the HCS-based sulfur(ZnS@HCS/S) cathode with controlled thickness, and the overall electrochemical properties are systematically evaluated. Results show that with 30 nm-thick ZnS coating, the cathode reveals an improved capacity of 1411 m A h g^(-1), and higher capacities from 0.2 to 3 C rate compared with bare HCS/S cathode. Moreover, the ZnS coating also enhances the cycling stability of ZnS@HCS/S cathode over 280 cycles at 0.5 C, with only 0.2% capacity decay per cycle. This work demonstrates potential applications for high-performance lithiumsulfur batteries.
基金
supported by the National Key Research and Development Program of China(Grant No.2016YFA0203301)
the Natural Science Foundation of Jiangxi Province and Anhui Province(Grant Nos.20202BAB204007&1808085QE140)
the National Natural Science Foundation of China(Grant Nos.52102040 and U1832136)
the Fundamental Research Funds for the Central Universities(Grant No.PA2021GDGP0059)。
