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Potassium Prussian Blue Nanoparticles: A Low-Cost Cathode Material for Potassium-Ion Batteries

机译：钾普鲁士蓝纳米粒子：钾离子电池的低成本阴极材料

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摘要

Potassium-ion batteries (KIBs) in organic electrolytes hold great promise as an electrochemical energy storage technology owing to the abundance of potassium, close redox potential to lithium, and similar electrochemistry with lithium system. Although carbon materials have been studied as KIB anodes, investigations on KIB cathodes have been scarcely reported. A comprehensive study on potassium Prussian blue K0.220Fe[Fe(CN)(6)](0.805)4.01H(2)O nanoparticles as a potential cathode material is for the first time reported. The cathode exhibits a high discharge voltage of 3.1-3.4 V, a high reversible capacity of 73.2 mAh g(-1), and great cyclability at both low and high rates with a very small capacity decay rate of approximate to 0.09% per cycle. Electrochemical reaction mechanism analysis identifies the carbon-coordinated Fe-III/Fe-II couple as redox-active site and proves structural stability of the cathode during charge/discharge. Furthermore, for the first time, a KIB full-cell is presented by coupling the nanoparticles with commercial carbon materials. The full-cell delivers a capacity of 68.5 mAh g(-1) at 100 mA g(-1) and retains 93.4% of the capacity after 50 cycles. Considering the low cost and material sustainability as well as the great electrochemical performances, this work may pave the way toward more studies on KIB cathodes and trigger future attention on rechargeable KIBs.
机译：有机电解质中的钾离子电池（KIBs）作为一种电化学储能技术，由于钾含量高，与锂具有接近的氧化还原电势以及与锂系统相似的电化学性能，具有广阔的前景。尽管已经对碳材料作为KIB阳极进行了研究，但几乎没有关于KIB阴极的研究报道。首次报道了普鲁士蓝钾K0.220Fe [Fe（CN）（6）]（0.805）4.01H（2）O纳米粒子作为潜在阴极材料的综合研究。阴极表现出3.1-3.4 V的高放电电压，73.2 mAh g（-1）的高可逆容量，以及在低速和高倍率下均具有出色的可循环性，每循环的容量衰减率非常小，约为0.09％。电化学反应机理分析确定了碳配位的Fe-III / Fe-II对为氧化还原活性位点，并证明了充电/放电过程中阴极的结构稳定性。此外，这是首次通过将纳米颗粒与商业碳材料偶联而呈现出KIB全细胞。全电池在100 mA g（-1）时提供68.5 mAh g（-1）的容量，并在50个循环后保留93.4％的容量。考虑到低成本和材料可持续性以及出色的电化学性能，这项工作可能为进一步研究KIB阴极铺平了道路，并引发了对可再充电KIB的未来关注。

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  • 来源
    《Advanced Functional Materials》 |2017年第4期|1604307.1-1604307.8|共8页
  • 作者

    Zhang Chenglin; Xu Yang; Zhou Min; Liang Liying; Dong Huishuang; Wu Minghong; Yang Yi; Lei Yong;

  • 作者单位

    Shanghai Univ, Sch Environm & Chem Engn, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China;

    Tech Univ Ilmenau, Inst Phys & IMN MacroNano ZIK, D-98693 Ilmenau, Germany;

    Tech Univ Ilmenau, Inst Phys & IMN MacroNano ZIK, D-98693 Ilmenau, Germany;

    Tech Univ Ilmenau, Inst Phys & IMN MacroNano ZIK, D-98693 Ilmenau, Germany;

    Shanghai Univ, Sch Environm & Chem Engn, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Sch Environm & Chem Engn, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Sch Environm & Chem Engn, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China;

    Shanghai Univ, Sch Environm & Chem Engn, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China|Tech Univ Ilmenau, Inst Phys & IMN MacroNano ZIK, D-98693 Ilmenau, Germany;

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  • 关键词

    cathodes; full-cells; nanoparticles; potassium-ion batteries; Prussian blue;

    机译：阴极;全电池;纳米粒子;钾离子电池;普鲁士蓝;

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