Original electrochemical mechanisms of CaSnO3 and CaSnSiO5 as anode materials for Li-ion batteries |
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| Authors: | M Mouyane M Womes JC Jumas J Olivier-Fourcade PE Lippens |
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| Institution: | Institut Charles Gerhardt, UMR 5253 CNRS, Equipe Agrégats, Interfaces et Matériaux pour l'Energie, Université Montpellier II, CC 1502, 34095 Montpellier Cedex 5, France |
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| Abstract: | Calcium stannate (CaSnO3) and malayaite (CaSnSiO5) were synthesized by means of a high temperature solid-state reaction. Their crystal structures and morphologies were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy; their electrochemical properties were analyzed by galvanostatic tests. The amorphization of the initial electrode materials was followed by XRD. The first discharge of the oxides CaSnO3 and CaSnSiO5 shows a plateau at low potential, which is due to the progressive formation of Li–Ca–Sn and/or Li–Sn alloys as shown by 119Sn Mössbauer spectroscopy. The results reveal similar electrochemical mechanisms for CaSnO3 and CaSnSiO5 but they completely differ from those related to SnO2. |
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| Keywords: | CaSnO3 CaSnSiO5 Li-ion batteries Anode 119Sn Mö ssbauer spectroscopy |
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