Tunable Layered (Na,Mn)V<sub>8</sub>O<sub>20</sub>·<i>n</i>H<sub>2</sub>O Cathode Material for High‐Performance Aqueous Zinc Ion Batteries

  • Min Du
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Chaofeng Liu
    Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA
  • Feng Zhang
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Wentao Dong
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Xiaofei Zhang
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Yuanhua Sang
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Jian‐Jun Wang
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Yu‐Guo Guo
    CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular Sciences Beijing National Laboratory for Molecular Sciences (BNLMS) Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 P. R. China
  • Hong Liu
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China
  • Shuhua Wang
    State Key Laboratory of Crystal Materials Shandong University Jinan 250100 P. R. China

抄録

<jats:title>Abstract</jats:title><jats:p>Rechargeable aqueous zinc‐ion batteries (ZIBs) show promise for use in energy storage. However, the development of ZIBs has been plagued by the limited cathode candidates, which usually show low capacity or poor cycling performance. Here, a reversible Zn//(Na,Mn)V<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub>·<jats:italic>n</jats:italic>H<jats:sub>2</jats:sub>O system is reported, the introduction of manganese (Mn) ions in NaV<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub> to form (Na,Mn)V<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub> exhibits an outstanding electrochemical performance with a capacity of 377 mA h g<jats:sup>−1</jats:sup> at a current density of 0.1 A g<jats:sup>−1</jats:sup>. Through experimental and theoretical results, it is discovered that the outstanding performance of (Na,Mn)V<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub>·<jats:italic>n</jats:italic>H<jats:sub>2</jats:sub>O is ascribed to the Mn<jats:sup>2+</jats:sup>/Mn<jats:sup>3+</jats:sup>‐induced high electrical conductivity and Na<jats:sup>+</jats:sup>‐induced fast migration of Zn<jats:sup>2+</jats:sup>. Other cathode materials derived from (Na,Mn)V<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub>·<jats:italic>n</jats:italic>H<jats:sub>2</jats:sub>O by substituting Mn with Fe, Co, Ni, Ca, and K are explored to confirm the unique advantages of transition metal ions. With an increase in Mn content in NaV<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub>, (Na<jats:sub>0.33</jats:sub>,Mn<jats:sub>0.65</jats:sub>)V<jats:sub>8</jats:sub>O<jats:sub>20</jats:sub> ·<jats:italic>n</jats:italic>H<jats:sub>2</jats:sub>O can deliver a reversible capacity of 150 mA h g<jats:sup>−1</jats:sup> and a capacity retention of 99% after 1000 cycles, which may open new opportunities for the development of high‐performance aqueous ZIBs.</jats:p>

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