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High Crystalline Prussian White Nanocubes as a Promising Cathode for Sodium‐ion Batteries
Author(s) -
Li Cong,
Zang Rui,
Li Pengxin,
Man Zengming,
Wang Shijian,
Li Xuemei,
Wu Yuhan,
Liu Shuaishuai,
Wang Guoxiu
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201701715
Subject(s) - prussian blue , materials science , cathode , crystallinity , electrochemistry , chemical engineering , ion , sodium , nanotechnology , electrode , inorganic chemistry , chemistry , metallurgy , composite material , organic chemistry , engineering
Prussian blue and its analogues (PBAs) have been recognized as one of the most promising cathode materials for room‐temperature sodium‐ion batteries (SIBs). Herein, we report high crystalline and Na‐rich Prussian white Na 2 CoFe(CN) 6 nanocubes synthesized by an optimized and facile co‐precipitation method. The influence of crystallinity and sodium content on the electrochemical properties was systematically investigated. The optimized Na 2 CoFe(CN) 6 nanocubes exhibited an initial capacity of 151 mA h g −1 , which is close to its theoretical capacity (170 mA h g −1 ). Meanwhile, the Na 2 CoFe(CN) 6 cathode demonstrated an outstanding long‐term cycle performance, retaining 78 % of its initial capacity after 500 cycles. Furthermore, the Na 2 CoFe(CN) 6 Prussian white nanocubes also achieved a superior rate capability (115 mA h g −1 at 400 mA g −1 , 92 mA h g −1 at 800 mA g −1 ). The enhanced performances could be attributed to the robust crystal structure and rapid transport of Na ions through large channels in the open‐framework. Most noteworthy, the as‐prepared Na 2 CoFe(CN) 6 nanocubes are not only low‐cost in raw materials but also contain a rich sodium content (1.87 Na ions per lattice unit cell), which will be favorable for full cell fabrication and large‐scale electric storage applications.