Sodium iron hexacyanoferrate with high Na content as a Na-rich cathode material for Na-ion batteries  

作　　者：Ya You Xiqian Yu Yaxia Yin Kyung-Wan Nam Yu-Guo Guo 

机构地区：[1]CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, Chino [2]Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA [3]Department of Energy and Materials Engineering, Dongguk University, Seoul 100-715, Republic of Korea

出　　处：《Nano Research》2015年第1期117-128,共12页纳米研究（英文版）

摘　　要：Owing to the worldwide abundance and low-cost of Na, room-temperature Na-ion batteries are emerging as attractive energy storage systems for large- scale grids. Increasing the Na content in cathode materials is one of the effective ways to achieve high energy density. Prussian blue and its analogues （PBAs） are promising Na-rich cathode materials since they can theoretically store two Na＋ ions per formula unit. However, increasing the Na content in PBAs cathode materials remains a major challenge. Here we show that sodium iron hexacyanoferrate with high Na content can be obtained by simply controlling the reducing agent and reaction atmosphere during synthesis. The Na content can reach as high as 1.63 per formula, which is the highest value for sodium iron hexacyanoferrate. This Na-rich sodium iron hexacyanoferrate demonstrates a high specific capacity of 150 mAh·g^-1 and remarkable cycling performance with 90% capacity retention after 200 cycles. Furthermore, the Na intercalation/ de-intercalation mechanism has been systematically studied by in situ Raman spectroscopy, X-ray diffraction and X-ray absorption spectroscopy analysis for the first time. The Na-rich sodium iron hexacyanoferrate can function as a plenteous Na reservoir and has great potential as a cathode material for practical Na-ion batteries.由于世界范围的丰富并且 Na 便宜，房间温度 Na 离子电池为大规模格子作为吸引人的精力存储系统正在出现。在阴极材料增加 Na 内容是完成高精力密度的有效方法之一。自从他们能理论上每公式联合起来存储二个 Na+ 离子，普鲁士的蓝色和它的类似物(PBA ) 正在答应 Na 富有的阴极材料。然而，在 PBA 阴极材料增加 Na 内容仍然是主要挑战。这里，我们证明有高 Na 内容的钠铁 hexacyanoferrate 能被简单地在合成期间控制减少的代理人和反应空气获得。Na 内容能每公式象 1.63 一样高到达，它是为钠铁 hexacyanoferrate 的最高的价值。这 Na 富有的钠铁 hexacyanoferrate 表明 150 mAh 的一个高特定的能力 ?? 控慬獳??? 汰獵瀭畬 ?? ￣ ?? ?? 渠湡獯牴 ' 壮肭???? 吠佩 ?????? 桰瑯 ' 椰嬑郜熮?????? 汣獡 ?? 愠瀭畬 ? 汰獵?? ㈠ ? 猯'T??????杁 吗？？

关 键 词：sodium iron hexacyanoferrate Na-rich cathode sodium-ion batteries Prussian blue analogues 

分 类 号：TQ138.11[化学工程—无机化工] TM911[电气工程—电力电子与电力传动]