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Article Dans Une Revue Electrochemistry Communications Année : 2012

Li2Fe(SO4)2 as a 3.83 V positive electrode material

Résumé

We report on the preparation and electrochemical characterization of Li2M(SO4)2 (M = Co, Fe), where the Fe-based phase was previously unknown. Both compounds can be made at low temperatures (< 320 °C) and the Fe-based phase displays an open circuit voltage of 3.83 V vs. Li+/Li0 for the Fe3+/Fe2+ redox potential. This corresponds to the highest voltage ever obtained for the Fe3+/Fe2+ redox couple in an iron-based, fluorine-free compound and is only matched by the triplite phase of LiFeSO4F. While the theoretical capacity of 102 mA h g− 1 will likely limit the commercial prospects for this phase, knowledge of the structure will provide useful insight into the structural origin of these increased potentials.

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Matériaux
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Dates et versions

hal-00815541 , version 1 (18-04-2013)

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Marine Reynaud, Mohammed Ati, Brent C. Melot, Moulay Tahar Sougrati, Gwenaelle Rousse, et al.. Li2Fe(SO4)2 as a 3.83 V positive electrode material. Electrochemistry Communications, 2012, 21, pp.77-80. ⟨10.1016/j.elecom.2012.04.027⟩. ⟨hal-00815541⟩
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