Journal
NANO LETTERS
Volume 17, Issue 8, Pages 4713-4718Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b01366
Keywords
Activation; Prussian blue analogues; etching; sodium ion batteries; solid-state diffusion
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Funding
- National Key Research and Development Program of China [2016YFA0202603]
- National Basic Research Program of China [2013CB934103]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- National Natural Science Foundation of China [51521001]
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- Fundamental Research Funds for the Central Universities [WUT: 2016III001, 2017IVA100]
- project of Innovative Group for Low Cost and Long Cycle Life Na-ion Batteries R&D and industrialization of Guangdong Province [2014ZT05N013]
- China Scholarship Council [201606955096]
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Sodium-ion battery technologies are known to suffer from kinetic problems associated with the solid-state diffusion of Na+ in intercalation electrodes, which results in suppressed specific capacity and degraded rate performance. Here, a controllable selective etching approach is developed for the synthesis of Prussian blue analogue (PBA) with enhanced sodium storage activity. On the basis of time dependent experiments, a defect-induced morphological evolution mechanism from nanocube to nanoflower structure is proposed. Through in situ X-ray diffraction measurement and computational analysis, this unique structure is revealed to provide higher Na+ diffusion dynamics and negligible volume change during the sodiation/desodiation processes. As a sodium ion battery cathode, the PBA exhibits a discharge capacity of 90 mA h g(-1), which is in good agreement with the complete low spin Fe-LS(C) redox reaction. It also demonstrates an outstanding rate capability of 71.0 mA h g(-1) at 44.4 C, as well as an unprecedented cycling reversibility over 5000 times.
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