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Condens. Matter 2018, 3(4), 36; https://doi.org/10.3390/condmat3040036

Operando XAFS and XRD Study of a Prussian Blue Analogue Cathode Material: Iron Hexacyanocobaltate

1
Department of Industrial Chemistry “Toso Montanari”, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
2
School of Science, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Macerata, Italy
3
Elettra–Sincrotrone Trieste, ss 14, km 163.5, 34149 Basovizza, Trieste, Italy
4
Institut Charles Gerhardt Montpellier, CNRS UMR 5253, Université de Montpellier, 34090 Montpellier, France
5
Réseau sur le Stockage Electrochimique de l’Energie (RS2E), CNRS FR3459, 80090 Amiens, France
*
Author to whom correspondence should be addressed.
Received: 9 October 2018 / Revised: 18 October 2018 / Accepted: 23 October 2018 / Published: 25 October 2018
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Abstract

The reversible electrochemical lithiation of potassium iron hexacyanocobaltate (FeCo) was studied by operando X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) assisted by chemometric techniques. In this way, it was possible to follow the system dynamics and retrieve structural and electronic transformations along cycling at both Fe and Co sites. These analyses confirmed that FeCo features iron as the main electroactive site. Even though the release of potassium ions causes a local disorder around the iron site, the material exhibits an excellent structural stability during the alkali ion deinsertion/insertion processes. An independent but interrelated analysis approach offers a good strategy for data treatment and provides a time-resolved picture of the studied system. View Full-Text
Keywords: battery; XRD; XAFS; EXAFS; MCR-ALS; operando battery; XRD; XAFS; EXAFS; MCR-ALS; operando
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Mullaliu, A.; Conti, P.; Aquilanti, G.; Plaisier, J.R.; Stievano, L.; Giorgetti, M. Operando XAFS and XRD Study of a Prussian Blue Analogue Cathode Material: Iron Hexacyanocobaltate. Condens. Matter 2018, 3, 36.

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