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Three Electron Reversible Redox Reaction in Sodium Vanadium Chromium Phosphate as a High‐Energy‐Density Cathode for Sodium‐Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-01-17 , DOI: 10.1002/adfm.201908680 Yongjie Zhao 1, 2 , Xiangwen Gao 2 , Hongcai Gao 2 , Haibo Jin 1 , John B. Goodenough 2
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-01-17 , DOI: 10.1002/adfm.201908680 Yongjie Zhao 1, 2 , Xiangwen Gao 2 , Hongcai Gao 2 , Haibo Jin 1 , John B. Goodenough 2
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A sodium‐ion battery operating at room temperature is of great interest for large‐scale stationary energy storage because of its intrinsic cost advantage. However, the development of a high capacity cathode with high energy density remains a great challenge. In this work, sodium super ionic conductor‐structured Na3V2−xCrx(PO4)3 is achieved through the sol–gel method; Na3V1.5Cr0.5(PO4)3 is demonstrated to have a capacity of 150 mAh g−1 with reversible three‐electron redox reactions after insertion of a Na+, consistent with the redox couples of V2+/3+, V3+/4+, and V4+/5+. Moreover, a symmetric sodium‐ion full cell utilizing Na3V1.5Cr0.5(PO4)3 as both the cathode and anode exhibits an excellent rate capability and cyclability with a capacity of 70 mAh g−1 at 1 A g−1. Ex situ X‐ray diffraction analysis and in situ impedance measurements are performed to reveal the sodium storage mechanism and the structural evolution during cycling.
中文翻译：
磷酸钒铬钠作为钠离子电池的高能量密度阴极中的三电子可逆氧化还原反应
在室温下工作的钠离子电池因其固有的成本优势而对于大规模固定式能量存储非常感兴趣。然而，开发具有高能量密度的高容量阴极仍然是巨大的挑战。在这项工作中，通过溶胶-凝胶法获得了钠超离子导体结构的Na 3 V 2- x Cr x（PO 4）3。Na 3 V 1.5 Cr 0.5（PO 4）3被证明具有150 mAh g -1的容量，插入Na +后可逆的三电子氧化还原反应，与V 2+ / 3+，V 3+ / 4+和V 4+ / 5+的氧化还原对一致。此外，利用对称钠离子全电池的Na 3 V 1.5铬0.5（PO 4）3作为阴极和阳极都表现出优异的倍率性能和循环性能为70毫安g的容量-1 1个A G -1。进行了异位X射线衍射分析和原位阻抗测量，以揭示循环过程中钠的储存机理和结构演变。
更新日期：2020-03-03
中文翻译：
磷酸钒铬钠作为钠离子电池的高能量密度阴极中的三电子可逆氧化还原反应
在室温下工作的钠离子电池因其固有的成本优势而对于大规模固定式能量存储非常感兴趣。然而，开发具有高能量密度的高容量阴极仍然是巨大的挑战。在这项工作中，通过溶胶-凝胶法获得了钠超离子导体结构的Na 3 V 2- x Cr x（PO 4）3。Na 3 V 1.5 Cr 0.5（PO 4）3被证明具有150 mAh g -1的容量，插入Na +后可逆的三电子氧化还原反应，与V 2+ / 3+，V 3+ / 4+和V 4+ / 5+的氧化还原对一致。此外，利用对称钠离子全电池的Na 3 V 1.5铬0.5（PO 4）3作为阴极和阳极都表现出优异的倍率性能和循环性能为70毫安g的容量-1 1个A G -1。进行了异位X射线衍射分析和原位阻抗测量，以揭示循环过程中钠的储存机理和结构演变。
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