An Oxysulfate Fe2O(SO4)2 Electrode for Sustainable Li-Based Batteries
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- 作者：Meiling Sun ; Gwena毛lle Rousse ; Artem M. Abakumov ; Gustaaf Van Tendeloo ; Moulay-Tahar Sougrati ; Matthieu Courty ; Marie-Liesse Doublet ; Jean-Marie Tarascon
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：September 10, 2014
- 年：2014
- 卷：136
- 期：36
- 页码：12658-12666
- 全文大小：680K
- ISSN：1520-5126
文摘
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 鈮?25 mAh/g. The Li insertion鈥揹einsertion 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.