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

作者：Sun Meiling; Rousse Gwenaelle; Abakumov Artem M; Van Tendeloo Gustaaf; Sougrati Moulay Tahar; Courty Matthieu; Doublet Marie Liesse; Tarascon Jean Marie^*

来源：Journal of the American Chemical Society, 2014, 136(36): 12658-12666.

DOI：10.1021/ja505268y

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 similar to 125 mAh/g. The Li insertiondeinsertion 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.

• 出版日期2014-9-10