High Crystalline Prussian White Nanocubes as a Promising Cathode for Sodium-ion Batteries

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Journal Article
Chemistry - An Asian Journal, 2018, 13 (3), pp. 342 - 349
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© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 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 Na2CoFe(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 Na2CoFe(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 Na2CoFe(CN)6 cathode demonstrated an outstanding long-term cycle performance, retaining 78 % of its initial capacity after 500 cycles. Furthermore, the Na2CoFe(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 Na2CoFe(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.
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