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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Na0.97KFe(SO4)(2): an iron-based sulfate cathode material with outstanding cyclability and power capability for Na-ion batteries
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Na0.97KFe(SO4)(2): an iron-based sulfate cathode material with outstanding cyclability and power capability for Na-ion batteries

机译：Na0.97KFE（SO4）（2）：一种基于铁的硫酸铁阴极材料，具有出色的Na离子电池的可行性和功率能力

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摘要

In this work, a novel cathode material for Na-ion batteries, Na0.97KFe(SO4)(2), was successfully prepared via slow evaporation and a low-temperature process, and its outstanding electrochemical performance was demonstrated. Based on the structural information of KFe(SO4)(2) obtained from Rietveld refinement of X-ray diffraction data, the possible atomic sites for Na ions entering the structure were verified using bond-valence sum energy maps. Electrochemical measurements and X-ray absorption near-edge structure analyses revealed that approximate to 0.97 mol Na ions can be reversibly (de)intercalated into the structure via the Fe3+/Fe2+ redox reaction. The average redox potential of Na0.97KFe(SO4)(2) was shown to be approximate to 3.27 V (vs. Na+/Na), which is higher than that of other Fe-based phosphates owing to the inductive effect of (SO4)(2-). It was verified that the specific capacity of Na0.97KFe(SO4)(2) at C/10 was approximate to 85 mA h g(-1). At 10C (full charge/discharge in 12 min), approximate to 53% of its capacity measured at C/10 was retained. In addition, up to approximate to 99% of its initial capacity was retained over 200 cycles at 1C with a high coulombic efficiency of 99.3097%, which was attributed to the negligible volume change (approximate to 1.8%) during charge/discharge.
机译：在这项工作中，通过缓慢蒸发和低温工艺成功制备了一种用于Na离子电池的新型阴极材料Na离子电池Na0.97KFE（SO4）（2），并证明了其出色的电化学性能。基于从X射线衍射数据的RIETVELD细化获得的KFE（SO4）（2）的结构信息，使用键合价和能量图验证进入结构的NA离子的可能原子位点。电化学测量和X射线吸收近边缘结构分析显示，近似为0.97mol Na离子，可以通过Fe 3 + / Fe 2 +氧化还原反应可逆地（de）嵌入结构中。 Na0.97KFe（SO 4）（2）的平均氧化还原电位显示为接近3.27（相对于的Na + / NA），其比由于诱导效应其它Fe系磷酸盐的更高（SO4） （2-）。验证了C / 10的Na0.97KFE（SO4）（2）的比容量近似为85 mA H g（-1）。在10℃（12分钟内完全充电/放电），保留了在C / 10处测量的其容量的53％。此外，最高达到其初始容量的99％在1℃下保留超过200周期，高库仑效率为99.3097％，归因于充电/放电期间可忽略的体积变化（约为1.8％）。

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