Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (2): 311-317.doi: 10.1007/s40242-021-0017-x

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Synthesis of SnS2 Ultrathin Nanosheets as Anode Materials for Potassium Ion Batteries

HU Rong1, FANG Yongzheng1, LIU Xiaoyu2, ZHU Kai1, CAO Dianxue1, YI Jin2, WANG Guiling1   

  1. 1. Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China;
    2. Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai 200444, P. R. China
  • Received:2021-01-12 Online:2021-04-01 Published:2021-02-25
  • Contact: WANG Guiling, YI Jin, ZHU Kai E-mail:wangguiling@hrbeu.edu.cn;jin.yi@shu.edu.cn;kzhu@hrbeu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos.21805182, 22075171) and the Fundamental Research Funds for the Central Universities of China.

Abstract: Potassium(K) ion batteries present their promising application for large-scale energy storage systems with cost-effective characteristic. Unfortunately, the large K ion radius results in sluggish K ion diffusion kinetics and volume expansion of the electrode during the K ion insertion/extraction process. It is a challenge to explore capable anode materials with remarkable K ion storage ability. Herein, we design and prepare SnS2 ultrathin nanosheets via a facile hydrothermal process. When severing as anode materials for K ion batteries with optimized electrolyte, SnS2 presents an improved capacity and rate ability. The capable electrochemical performance is ascribed to the reduced ion diffusion pathway and capacitor-dominated K-ion storage process. In addition, the K ion storage mechanism of SnS2 is investigated by the ex-situ X-ray diffraction technique.

Key words: SnS2, Electrolyte, Potassium ion battery, Anode