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Hierarchical VS 2 Nanosheet Assemblies: A Universal Host Material for the Reversible Storage of Alkali Metal Ions
Author(s) -
Zhou Junhua,
Wang Lu,
Yang Mingye,
Wu Jinghua,
Chen Fengjiao,
Huang Wenjing,
Han Na,
Ye Hualin,
Zhao Feipeng,
Li Youyong,
Li Yanguang
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201702061
Subject(s) - nanosheet , materials science , intercalation (chemistry) , alkali metal , electrochemical energy storage , electrochemistry , ion , nanotechnology , electrode , stacking , energy storage , metal ions in aqueous solution , metal , chemical engineering , inorganic chemistry , supercapacitor , chemistry , metallurgy , organic chemistry , power (physics) , physics , quantum mechanics , engineering
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 VS 2 nanosheet assemblies. Individual nanosheets are featured with a few atomic layer thickness, and they are hierarchically arranged with minimized stacking. Electrochemical measurements show that VS 2 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 VS 2 has large adsorption energy and low diffusion barriers for the intercalation of alkali metal ions.