期刊
APPLIED SURFACE SCIENCE
卷 536, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147832
关键词
Potassium ion batteries; SnS anode; Grapheme; Potential range; Cycling stability
类别
资金
- National Natural Science Foundation of China [51702063]
- Natural Science Foundation of Heilongjiang [LC2018004]
- China Postdoctoral Science Foundation [2018M630340, 2019T120254]
- Fundamental Research Funds for the Central University
This study focuses on designing and synthesizing carbon-coated SnS nanosheets and reduced graphene oxide (SnS@C/rGO) composite to enhance the rate performance of SnS, a critical issue in achieving high-performance PIBs. By optimizing the voltage window and investigating K ions storage mechanism and electrochemical kinetics, the study highlights the important effect of dual-carbon modification and adjusting the potassiation stage on K ion storage.
Potassium ion batteries (PIBs) have attracted lots of attention due to its abundant resources. Exploring capable anode materials becomes one of the critical issues to achieve high-performance PIBs. Herein, carbon-coated SnS nanosheets and reduced graphene oxide (SnS@C/rGO) composite are designed and synthesized by a solvothermal reaction and heat treatment. The strategy of double carbon modification enhances the rate performance of SnS. Meanwhile, the cycling stability of SnS@C/rGO can be further improved by optimizing the voltage window, which can achieve the potassiation stage adjustment. K ions storage mechanism of SnS@C/rGO is investigated under different voltage windows. The deep alloying reaction occurs under low potential and is harmful to cycling performance. Moreover, the electrochemical kinetics of K ions storage is investigated by quantitative kinetics analysis. This work highlights the important effect of dual-carbon modification and adjusting the potassiation stage on the K ion storage.
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