Reversible Calcium Ion Batteries Using a Dehydrated Prussian Blue Analogue Cathode

Prussian blue analogue (KMFe-PBA), KxMFe(CN)(6)center dot nH(2)O, was investigated as a new cathode material to insert/extract Ca2+ reversibly using a Ca-based organic electrolyte. A dehydrated KNiFe-PBA (i.e. KxNiFe(CN)(6)) electrode with a high electro-conductive additive demonstrated reversible capacities of similar to 50 mAh/g with Coulombic efficiencies of similar to 92% even though the decomposed capacity of the electrolyte was indicated at the discharge. During the 1st discharge and discharge-charge, a detailed structural characterization was performed using an ex-situ X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). XRD patterns and XPS spectra on the discharged and discharged-charged cathodes indicate that Ca2+ is inserted and extracted into and from the interstitial sites of KNiFe-PBA without destruction of the open framework structure. (C) 2016 Elsevier Ltd. All rights reserved.

普鲁士蓝类似物（KMFe - PBA），KxMFe(CN)₆·nH₂O，作为一种新型正极材料被研究，该材料可使用钙基有机电解质可逆地嵌入/脱嵌Ca²⁺。一种含有高导电添加剂的脱水KNiFe - PBA（即KxNiFe(CN)₆）电极表现出约50 mAh/g的可逆容量，库仑效率约为92%，尽管在放电时显示出电解质有分解容量。在首次放电以及放电 - 充电过程中，利用非原位X射线衍射（XRD）、能量色散X射线光谱（EDX）和X射线光电子能谱（XPS）进行了详细的结构表征。放电态和放电 - 充电态正极的XRD图谱和XPS光谱表明，Ca²⁺可嵌入KNiFe - PBA的间隙位置并从中脱嵌，且开放框架结构未被破坏。© 2016 Elsevier Ltd.保留所有权利。