An Oxysulfate Fe2O(SO4)2 Electrode for Sustainable Li-Based Batteries

Meiling Sun , Gwenaëlle Rousse (1, 2) , Artem M. Abakumov , Gustaaf Van Tendeloo , Moulay Tahar Sougrati (3, 1) , Matthieu Courty , Marie-Liesse Doublet (3, 1) , Jean‐marie Tarascon (4, 1)

1 RS2E - Réseau sur le stockage électrochimique de l'énergie
2 UPMC - Université Pierre et Marie Curie - Paris 6
3 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
4 Collège de France - Chaire Chimie du solide et énergie

High-performing Fe-based electrodes for Li-based batteries are eagerly pursued because of the abundance and environmental benignity of iron, with especially great interest in polyanionic compounds because of their flexibility in tuning the Fe3+/Fe2+ redox potential. We report herein the synthesis and structure of a new Fe-based oxysulfate phase, Fe2O(SO4)2, made at low temperature from abundant elements, which electrochemically reacts with nearly 1.6 Li atoms at an average voltage of 3.0 V versus Li+/Li, leading to a sustained reversible capacity of ≈125 mAh/g. The Li insertion–deinsertion process, the first ever reported in any oxysulfate, entails complex phase transformations associated with the position of iron within the FeO6 octahedra. This finding opens a new path worth exploring in the quest for new positive electrode materials.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Meiling Sun, Gwenaëlle Rousse, Artem M. Abakumov, Gustaaf Van Tendeloo, Moulay Tahar Sougrati, et al.. An Oxysulfate Fe2O(SO4)2 Electrode for Sustainable Li-Based Batteries. Journal of the American Chemical Society, 2014, 136 (36), pp.12658-12666. ⟨10.1021/ja505268y⟩. ⟨hal-01075348⟩