Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 39, Pages 22248-22256Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta08603j
Keywords
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Funding
- National Natural Science Foundation of China [21573147, 21676165]
- Natural Science Foundation of Shanghai [19ZR 1424600]
- U.S. DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Beijing Institute of Technology Teli Young Fellow Program [3090011181903]
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The microstructure and morphology of the crystal play an important role in the physical and electrochemical properties of electrode materials. Here we report a highly crystalline microcube structure of Na-rich Prussian white Na1.92Mn[Fe(CN)(6)](0.98) for sodium ion battery cathodes. The obtained structure features high crystallinity of the monoclinic structure with an average cubic size of 3-5 mu m. Because of the improvement on microstructural and electrical properties, the cathode design enables promising electrochemical performance. The electrode exhibits an outstanding rate performance with reversible capacities of 152.8 mA h g(-1) (10 mA g(-1)), 128.1 mA h g(-1) (100 mA g(-1)), 118.7 mA h g(-1) (500 mA g(-1)) and 110.3 mA h g(-1) (1000 mA g(-1)). It also exhibits a good cycling performance with a capacity retention of 82% after 500 cycles at 100 mA g(-1). More importantly, the XRD analysis reveals a highly reversible monoclinic-cubic-monoclinic structural evolution of the cathode upon Na+ extraction/insertion. The good rate and cycling performance can be attributed to the robust crystal structure with few defects and fast Na+ transfer kinetics. The high purity single crystal morphology can also reduce the side reactions on the electrode/electrolyte interface.
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