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Reversible Calcium Ion Batteries Using a Dehydrated Prussian Blue Analogue Cathode
Ist Teil von
Electrochimica acta, 2016-07, Vol.207, p.22-27
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Prussian blue analogue (KMFe-PBA), KxMFe(CN)6·nH2O, 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 ∼50mAh/g with Coulombic efficiencies of ∼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.