A Chemical Precipitation Method Preparing Hollow-Core-Shell Heterostructures Based on the Prussian Blue Analogs as Cathode for Sodium-Ion Batteries

作者：Huang, Yongxin; Xie, Man; Wang, Ziheng; Jiang, Ying; Yao, Ying; Li, Shuaijie; Li, Zehua; Li, Li; Wu, Feng; Chen, Renjie^*

来源：Small, 2018, 14(28): 1801246.

DOI：10.1002/smll.201801246

• cathodes
• core-shell structures
• hollow structures
• Prussian blue analogs
• sodium-ion batteries

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.

• 出版日期2018-7-12
• 单位北京理工大学