4 years ago

Hierarchical VS2 Nanosheet Assemblies: A Universal Host Material for the Reversible Storage of Alkali Metal Ions

Hierarchical VS2 Nanosheet Assemblies: A Universal Host Material for the Reversible Storage of Alkali Metal Ions
Na Han, Youyong Li, Yanguang Li, Feipeng Zhao, Fengjiao Chen, Jinghua Wu, Mingye Yang, Wenjing Huang, Junhua Zhou, Hualin Ye, Lu Wang
Reversible electrochemical storage of alkali metal ions is the basis of many secondary batteries. Over years, various electrode materials are developed and optimized for a specific type of alkali metal ions (Li+, Na+, or K+), yet there are very few (if not none) candidates that can serve as a universal host material for all of them. Herein, a facile solvothermal method is developed to prepare VS2 nanosheet assemblies. Individual nanosheets are featured with a few atomic layer thickness, and they are hierarchically arranged with minimized stacking. Electrochemical measurements show that VS2 nanosheet assemblies enable the rapid and durable storage of Li+, Na+, or K+ ions. Most remarkably, the large reversible specific capacity and great cycling stability observed for both Na+ and K+ are extraordinary and superior to most existing electrode materials. The experimental results of this study are further supported by density functional theory calculations showing that the layered structure of VS2 has large adsorption energy and low diffusion barriers for the intercalation of alkali metal ions. Hierarchical VS2 nanosheet assemblies featuring a few atomic-layer nanosheet thickness are prepared by a facile solvothermal method in N-methyl-2-pyrrolidone. They can serve as a universal host material for the reversible electrochemical storage of Li+, Na+, or K+ ions with large capacity, great rate capability, and satisfactory cycling stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201702061

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