期刊
SMALL
卷 14, 期 28, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801246
关键词
cathodes; core-shell structures; hollow structures; Prussian blue analogs; sodium-ion batteries
类别
资金
- National Key Research and Development Program [2016YFB0901501]
- National Natural Science Foundation of China [51772030]
- Joint Funds of the National Natural Science Foundation of China [U1564206]
- Major achievements Transformation Project for Central University in Beijing
- Science and Technology Project of State Grid Corporation of China [15-JS-191]
- Graduated Technological Innovation Project of Beijing Institute of Technology
Prussian blue and its analogs are regarded as the promising cathodes for sodium-ion batteries (SIBs). Recently, various special structures are constructed to improve the electrochemical properties of these materials. In this study, a novel architecture of Prussian blue analogs with large cavity and multilayer shells is investigated as cathode material for SIBs. Because the hollow structure can relieve volume expansion and core-shell heterostructure can optimize interfacial properties, the complex structure materials exhibited a highly initial capacity of 123 mA h g(-1) and a long cycle life. After 600 cycles, the reversible capacity of the electrode still maintains at 102 mA h g(-1) without significant voltage decay, indicating a superior structure stability and sodium storage kinetics. Even at high current density of 3200 mA g(-1), the electrode still delivers a considerable capacity above 52 mA h g(-1). According to the electrochemical analysis and ex-situ measurements, it can be inferred that the enhanced apparent diffusion coefficient and improved insertion/extraction performance of electrode have been obtained by building this new morphology.
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