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

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

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

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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.

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《天然气化学（英文版）》 |2021年第1期|377-384|共8页
作者
Weijun Zhou; Minfeng Chen; Anran Wang; Aixiang Huang; Jizhang Chen; Xinwu Xu; Ching-Ping Wong;
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作者单位

College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 Jiangsu China;

College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 Jiangsu China;

College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 Jiangsu China;

College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 Jiangsu China;

College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 Jiangsu China;

College of Materials Science and Engineering Nanjing Forestry University Nanjing 210037 Jiangsu China;

School of Materials Science and Engineering Georgia Institute of Technology Atlanta United States;

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

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