Title
An oxysulfate <tex>$Fe_{2}O(SO_{4})_{2}$</tex> electrode for sustainable Li-based batteries An oxysulfate <tex>$Fe_{2}O(SO_{4})_{2}$</tex> electrode for sustainable Li-based batteries
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington, D.C. ,
Subject
Chemistry
Source (journal)
Journal of the American Chemical Society. - Washington, D.C.
Volume/pages
136(2014) :36 , p. 12658-12666
ISSN
0002-7863
ISI
000341544600029
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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 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.
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