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首页> 外文期刊>Advanced energy materials >Stress Distortion Restraint to Boost the Sodium Ion Storage Performance of a Novel Binary Hexacyanoferrate
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Stress Distortion Restraint to Boost the Sodium Ion Storage Performance of a Novel Binary Hexacyanoferrate

机译：应力畸变抑制可提高新型二元六氰合铁酸盐的钠离子存储性能

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Mn-based hexacyanoferrate NaxMnFe(CN)(6) (NMHFC) has been attracting more attention as a promising cathode material for sodium ion storage owing to its low cost, environmental friendliness, and its high voltage plateau of 3.6 V, which comes from the Mn2+/Mn3+ redox couple. In particular, the Na-rich NMHFC (x > 1.40) with trigonal phase is considered an attractive candidate due to its large capacity of approximate to 130 mAh g(-1), delivering high energy density. Its unstable cycle life, however, is holding back its practical application due to the dissolution of Mn2+ and the trigonal-cubic phase transition during the charge-discharge process. Here, a novel hexacyanoferrate (Na1.60Mn0.833Fe0.167[Fe(CN)(6)], NMFHFC-1) with Na-rich cubic structure and dual-metal active redox couples is developed for the first time. Through multiple structural modulation, the stress distortion is minimized by restraining Mn2+ dissolution and the trigonal-cubic phase transition, which are common issues in manganese-based hexacyanoferrate. Moreover, NMFHFC-1 simultaneously retains an abundance of Na ions in the framework. As a result, Na1.60Mn0.833Fe0.167[Fe(CN)(6)] electrode delivers high energy density (436 Wh kg(-1)) and excellent cycle life (80.2% capacity retention over 300 cycles), paving the way for the development of novel commercial cathode materials for sodium ion storage.
机译：锰基六氰合铁酸盐NaxMnFe（CN）（6）（NMHFC）作为低成本的钠离子存储正极材料，由于其低成本，环境友好以及其3.6 V的高压平稳性而受到了越来越多的关注。 Mn2 + / Mn3 +氧化还原对。特别是，具有三角相的富钠NMHFC（x> 1.40）被认为是有吸引力的候选物，因为它的大容量约为130 mAh g（-1），可提供高能量密度。但是，由于在放电过程中Mn2 +的溶解和三角形-立方相变，其不稳定的循环寿命使它的实际应用受到了限制。在这里，首次开发了具有富钠立方结构和双金属活性氧化还原对的新型六氰基高铁酸盐（Na1.60Mn0.833Fe0.167 [Fe（CN）（6）]，NMFHFC-1）。通过多重结构调制，通过限制锰基六氰合铁酸盐中常见的Mn2 +溶解和三角形-立方相变，将应力变形最小化。此外，NMFHFC-1同时在框架中保留了大量的Na离子。结果，Na1.60Mn0.833Fe0.167 [Fe（CN）（6）]电极可提供高能量密度（436 Wh kg（-1））和出色的循环寿命（在300个循环中保持80.2％的容量），为开发用于钠离子存储的新型商业阴极材料的方法。

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