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35. Nitrogen-doped carbon and reduced graphene oxide co-decorated SnS2 nanoplates for high efficiency lithium/sodium ion storage.

Author

Wang, Hua-Ying, Yang, Xiao-Xiao, Gao, Fen, Zhang, Bo-Han, Wen, Wan-Xin, Chen, Jing-Zhou, Hou, Yun-Lei, and Zhao, Dong-Lin

Abstract

Laminated metal sulfide is a unique material with a graphite-like structure and good storage capacity for both lithium and sodium ions. However, the inherent low electrical conductivity and severe volume expansion of SnS2 lead to poor electrochemical properties, further limiting practical applications. In this work, a nitrogen-doped carbon (NC) and reduced graphene oxide (rGO) co-decorated SnS2 nanoplatelets (SnS2/NC-rGO) using dopamine (PDA) and graphene oxide (GO) as carbon sources are cleverly designed. SnS2/NC wrapped with rGO is synthesized via hydrothermal followed by calcination. This design not only increases the electrical conductivity of the composite but also provides more pathways for ions/electrons. Furthermore, the larger specific surface area of the composite allows better contact between the electrolyte and the electrode, which further enhances the redox dynamics of lithium ions/sodium ions. Thanks to this structure, the charge/discharge specific capacity of the SnS2/NC-rGO composite electrode is 1215.8/1220.7 mAh g−1 after 200 cycles at 0.1 A g−1. The superior sodium storage performance has also been demonstrated in sodium-ion batteries, where a high specific capacity of 501.6 mAh g−1 can be achieved after 80 cycles at a current density of 0.1 A g−1. [ABSTRACT FROM AUTHOR]

Published
2023
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