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首页> 外文期刊>Advanced Functional Materials >High-Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium-Ion Batteries
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High-Performance Manganese Hexacyanoferrate with Cubic Structure as Superior Cathode Material for Sodium-Ion Batteries

机译：具有立方结构的高性能六氰合高锰酸锰作为钠离子电池的优质阴极材料

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摘要

Sodium manganese hexacyanoferrate (NaxMnFe(CN)(6)) is one of the most promising cathode materials for sodium-ion batteries (SIBs) due to the high voltage and low cost. However, its cycling performance is limited by the multiple phase transitions during Na+ insertion/extraction. In this work, a facile strategy is developed to synthesize cubic and monoclinic structured NaxMnFe(CN)(6), and their structure evolutions are investigated through in situ X-ray diffraction (XRD), ex situ Raman, and X-ray photoelectron spectroscopy (XPS) characterizations. It is revealed that the monoclinic phase undergoes undesirable multiple two-phase reactions (monoclinic <-> cubic <-> tetragonal) due to the large lattice distortions caused by the Jahn-Teller effects of Mn3+, resulting in poor cycling performances with 38% capacity retention. The cubic NaxMnFe(CN)(6) with high structural symmetry maintains the structural stability during the repeated Na+ insertion/extraction process, demonstrating impressive electrochemical performances with specific capacity of approximate to 120 mAh g(-1) at 3.5 V (vs Na/Na+), capacity retention of approximate to 70% over 500 cycles at 200 mA g(-1). In addition, the TiO2//C-MnHCF full battery is fabricated with an energy density of 111 Wh kg(-1), suggesting the great potential of cubic NaxMnFe(CN)(6) for practical energy storage applications.
机译：六氰合铁酸锰钠（NaxMnFe（CN）（6））由于高电压和低成本而成为最有希望的钠离子电池（SIB）阴极材料之一。但是，其循环性能受到Na +插入/萃取过程中的多个相变的限制。在这项工作中，开发了一种简便的策略来合成立方和单斜晶结构的NaxMnFe（CN）（6），并通过原位X射线衍射（XRD），非原位拉曼光谱和X射线光电子能谱研究了它们的结构演变。 （XPS）表征。结果表明，由于Mn3 +的Jahn-Teller效应引起的大晶格畸变，单斜晶相经历了不希望的多个两相反应（单斜晶立方和四方晶），导致循环性能差，容量为38％保留。具有高结构对称性的立方NaxMnFe（CN）（6）在重复的Na +插入/萃取过程中保持结构稳定性，显示出令人印象深刻的电化学性能，在3.5 V（vs Na /时的比容量约为120 mAh g（-1） Na +），在200 mA g（-1）下500个循环中的容量保持率大约为70％。此外，TiO2 // C-MnHCF充满电池的能量密度为111 Wh kg（-1），表明立方NaxMnFe（CN）（6）在实际的储能应用中具有巨大的潜力。

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  • 来源
    《Advanced Functional Materials》 |2020年第10期|1908754.1-1908754.9|共9页
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    Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Sch Elect & Elect Engn Wuhan 430074 Hubei Peoples R China|Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol Sch Mat Sci & Engn Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Mat Proc & Die & Mould Technol Sch Mat Sci & Engn Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Sch Elect & Elect Engn Wuhan 430074 Hubei Peoples R China;

    Ctr Excellence Transportat Electrificat & Energy 806 Blvd Lionel Roulet Varennes PQ J3X 1S1 Canada;

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  • 关键词

    cubic; manganese hexacyanoferrate; monoclinic; structure evolution;

    机译：立方体;六氰合铁酸锰;单斜结构演变;

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