Journal
NANO RESEARCH
Volume 11, Issue 8, Pages 3979-3990Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-1979-y
Keywords
sodium-rich; sodium iron hexacyanoferrate; hollow nanospheres; cathode; sodium-ion batteries
Categories
Funding
- Australian Renewable Energy Agency (ARENA) project [ARENA 2014/RND106]
- Australian Research Council (ARC) [DP170100436]
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Recently, Prussian blue and its analogues (PBAs) have attracted tremendous attention as cathode materials for sodium-ion batteries because of their good cycling performance, low cost, and environmental friendliness. However, they still suffer from kinetic problems associated with the solid-state diffusion of sodium ions during charge and discharge processes, which leads to low specific capacity and poor rate performances. In this work, novel sodium iron hexacyanoferrate nanospheres with a hierarchical hollow architecture have been fabricated as cathode material for sodium-ion batteries by a facile template method. Due to the unique hollow sphere morphology, sodium iron hexacyanoferrate nanospheres can provide large numbers of active sites and high diffusion dynamics for sodium ions, thus delivering a high specific capacity (142 mAh/g), a superior rate capability, and an excellent cycling stability. Furthermore, the sodium insertion/extraction mechanism has been studied by in situ X-ray diffraction, which provides further insight into the crystal structure change of the sodium iron hexacyanoferrate nanosphere cathode material during charge and discharge processes.
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