An oxysulfate Fe2O(SO4)2 electrode for sustainable li-based batteries

Meiling Sun, Gwenaëlle Rousse, Artem M. Abakumov, Gustaaf Van Tendeloo, Moulay Tahar Sougrati, Matthieu Courty, Marie Liesse Doublet, Jean Marie Tarascon

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)12658-12666
Number of pages9
JournalJournal of the American Chemical Society
Volume136
Issue number36
DOIs
Publication statusPublished - 10 Sep 2014
Externally publishedYes

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