普鲁士蓝
钠
阴极
材料科学
离子
扩散
电化学
化学工程
纳米技术
无机化学
电极
化学
冶金
有机化学
工程类
物理化学
物理
热力学
作者
Xiao Tang,Hao Líu,Dawei Su,Peter Notten,Guoxiu Wang
出处
期刊:Nano Research
[Springer Nature]
日期:2018-01-25
卷期号:11 (8): 3979-3990
被引量:90
标识
DOI:10.1007/s12274-018-1979-y
摘要
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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