Résumé
Developing the next generations of Li- and Na-ion batteries relies on designing new sustainable, low-cost and safe electrode materials. In such an attempt, we investigated several series of bimetallic sulfates, among them we identified Na2Fe(SO4)2*4H2O, Na2Fe(SO4)2 and Li2Fe(SO4)2, which present attractive electrochemical properties against both lithium and sodium. With a potential of 3.83 V vs. Li+/Li0, the new lithium iron sulfate Li2Fe(SO4)2 displays indeed the highest potential ever obtained for the Fe3+/Fe2+ redox couple in an iron-based fluorine-free compound. 10.1149/05024.0011ecst ECS Trans. 2013 volume 50, issue 24, 11-19