Optimizing the electrolyte salt of aqueous zinc-ion batteries based on a high-performance calcium vanadate hydrate cathode material

作     者：Weijun Zhou Minfeng Chen Anran Wang Aixiang Huang Jizhang Chen Xinwu Xu Ching-Ping Wong Weijun Zhou;Minfeng Chen;Anran Wang;Aixiang Huang;Jizhang Chen;Xinwu Xu;Ching-Ping Wong

作者机构：College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037JiangsuChina School of Materials Science and EngineeringGeorgia Institute of TechnologyAtlantaUnited States 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第1期

页      面：377-384,I0012页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：the financial support from the National Natural Science Foundation of China (No. 51902165) the Natural Science Foundation of Jiangsu Province (No. BK20170917) the Scientific Research Foundation for High-Level Talents of Nanjing Forestry University (No. GXL2016023) the Program of High-Level Talents in Six Industries of Jiangsu Province (No. XCL-040) the Jiangsu Specially-Appointed Professor Program。 

主　　题：Calcium vanadate hydrates Electrolytes Interfacial stability Zn-ion batteries Aqueous energy storage 

摘      要：It is urgent to develop high-performance cathode materials for the emerging aqueous zinc-ion batteries with a facile strategy and optimize the related components.Herein,a Ca0.23V2O5·0.95 H2O nanobelt cathode material with a rather large interlayer spacing of 13.0 A is prepared via a one-step hydrothermal approach.The battery with this cathode material and 3 M Zn(CF3SO3)2 electrolyte displays high specific capacity(355.2 mAh g^(-1) at 0.2 A g^(-1)),great rate capability(240.8 mAh g^(-1) at 5 A g^(-1)),and excellent cyclability(97.7% capacity retention over 2000 cycles).Such superior performances are ascribed to fast electrochemical kinetics,outstanding electrode/electrolyte interface stability,and nearly dendrite-free characteristic.Instead,when ZnSO4 or Zn(ClO4)2 is used to replace Zn(CF3SO3)2,the electrochemical performances become much inferior,due to the slow electrochemical kinetics,inhomogeneous Zn stripping/plating process,and the formation of large dendrites and byproducts.This work not only discloses a high-performance cathode material for aqueous zinc-ion batteries but also offers a reference for the choice of electrolyte salt.