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Pàgina inicial > Articles > Articles publicats > Operando Synchrotron X-ray Diffraction in Calcium Batteries : |
Data: | 2021 |
Resum: | 1D CaCoMO (M = Co z = 0, M = Mn z = 1, and M = Fe z = 0. 4) were prepared and tested electrochemically. While the iron-containing phase was not found to be active, the iron- and manganese-containing phases were found to be potentially interesting as positive electrode materials for calcium metal-based high-energy battery technologies and were investigated by operando synchrotron X-ray diffraction. Results indicate that electrochemically driven calcium deintercalation from the crystal structure (ca. 0. 7 mol per formula unit) takes place upon oxidation in both cases. The oxidized phases have incommensurate modulated crystal structures with the space group R 3 m (00γ)0s and a = 9. 127(1) Å, c = 2. 4226(3) Å and c = 4. 1857(3) Å, and γ = 0. 579 (M = Co) and a = 9. 217(1) Å, c = 4. 9076(4) Å and c = 4. 3387(4) Å, and γ = 1. 139 (M = Mn), which exhibit differences due to the presence of manganese and Mn/Co ordering. The degree of calcium re-intercalation within the structure was found to be extremely limited, if any. Complementary experiments carried out in lithium cells did not show any reversibility either, thus pointing at intrinsic structural/migration constraints in the oxidized phase rather than slow kinetics of high desolvation energies associated with divalent ion charge carriers. |
Ajuts: | Agencia Estatal de Investigación CEX2019-000917-S European Commission 743439 European Commission 754397 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Publicat a: | Energy & Fuels, Vol. 35, Issue 13 (June 2021) , p. 10898-10907, ISSN 1520-5029 |
10 p, 7.7 MB |