Insights into the Storage Mechanism of Layered VS2 Cathode in Alkali Metal-Ion Batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Xiao Zhang
  • Qiu He
  • Xiaoming Xu
  • Zhitong Xiao
  • Jiashen Meng
  • Xuanpeng Wang
  • Lu Wu
  • Jinghui Chen
  • Liqiang Mai

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1904118
Number of pages8
Journal / PublicationAdvanced Energy Materials
Volume10
Issue number22
Online published24 Apr 2020
Publication statusPublished - 9 Jun 2020

Abstract

VS2 is one of the attractive layered cathodes for alkali metal-ion batteries. However, the understanding of the detailed reaction processes and energy storage mechanism is still inadequate. Herein, the Li+/Na+/K+ insertion/extraction mechanisms of VS2 cathode are elucidated on the basis of experimental analyses and theoretical simulations. It is found that the insertion/extraction behavior of Li+ is partially irreversible, while the insertion/extraction behavior of Na+/K+ is completely reversible. The detailed intermediates and final products (Li0.33VS2, LiVS2, Na0.5VS2, NaVS2, K0.6VS2, KzVS2, z > 0.6) during the discharging/charging processes are identified, indicating that VS2 undergoes different phase transitions and solid–solution reactions in different battery systems, which have a great influence on the battery performance. Moreover, the diffusion of Na+ in VS2 cathode is demonstrated to be much slower than that of Li+ and K+. Such mechanistic research provides a reference for in-depth understanding of energy storage in layered transition metal sulfides/selenides.

Research Area(s)

  • alkali metal-ion batteries, layered cathodes, reaction mechanisms, VS2

Citation Format(s)

Insights into the Storage Mechanism of Layered VS2 Cathode in Alkali Metal-Ion Batteries. / Zhang, Xiao; He, Qiu; Xu, Xiaoming; Xiong, Tengfei; Xiao, Zhitong; Meng, Jiashen; Wang, Xuanpeng; Wu, Lu; Chen, Jinghui; Mai, Liqiang.

In: Advanced Energy Materials, Vol. 10, No. 22, 1904118, 09.06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal