5 years ago

Activation of Sodium Storage Sites in Prussian Blue Analogues via Surface Etching

Activation of Sodium Storage Sites in Prussian Blue Analogues via Surface Etching
Qi Li, Lei Zhang, Mengyu Yan, Dongna Liu, Liqiang Mai, Mingsheng Qin, Zixuan Zhu, Wenhao Ren
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 FeLS(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.

Publisher URL: http://dx.doi.org/10.1021/acs.nanolett.7b01366

DOI: 10.1021/acs.nanolett.7b01366

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