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 

机构地区：[1]College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China [2]School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,United States

出　　处：《Journal of Energy Chemistry》2021年第1期377-384,I0012,共9页能源化学（英文版）

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。

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.

关 键 词：Calcium vanadate hydrates Electrolytes Interfacial stability Zn-ion batteries Aqueous energy storage 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ132.32[化学工程—无机化工]