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Aqueous Batteries Based on Mixed Monovalence Metal Ions: A New Battery Family

Authors

  • Dr. Liang Chen,

    1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (P.R. China)
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    • These authors contributed equally to this work.

  • Leyuan Zhang,

    1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (P.R. China)
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    • These authors contributed equally to this work.

  • Prof. Xufeng Zhou,

    Corresponding author
    1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (P.R. China)
    • Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (P.R. China)===

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  • Prof. Zhaoping Liu

    Corresponding author
    1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (P.R. China)
    • Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201 (P.R. China)===

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Abstract

As existing battery technologies struggle to meet the requirements for widespread use in the field of large-scale energy storage, new concepts are urgently needed to build batteries with high energy density, low cost, and good safety. Here, we demonstrate two new aqueous batteries based on two monovalence metal ions (Li+/K+ and Na+/K+) as charge-transfer ions, Ni1Zn1HCF/TiP2O7 and Ni1Zn1HCF/NaTi2(PO4)3. These new batteries are unlike the conventional “rocking-chair” aqueous metal-ion batteries based on the migration of one type of shuttle ion between cathode and anode. They can deliver specific energy of 46 Wh kg−1 and 53 Wh kg−1 based on the total mass of active materials; this is superior to current aqueous battery systems based on sodium-ion and/or potassium-ion technologies. These two new batteries together with the previously developed Li+/Na+ mixed-ion battery not only constitute a new battery family for energy storage, but also greatly broaden our horizons for battery research.

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