Crystallographic and magnetic study of new potassium-based fluorosulfates for Li-ion batteries
We have recently discovered a new family of positive electrode material for Li-ion batteries: iron fluorosulfates. Among them KFeSO4F crystallises in the KTiOPO4 (KTP) structure, and one can remove K electrochemically and chemically, leading to KTP-like FeSO4F, into which we could further re-insert some other alkaline ions (Na, Li) at an attractive redox potential. We would like to measure this sample, the colbalt analog and the iron K-depleted one, plus the Na and Li reinserted samples to precisely locate the alkaline ions within the framework. Moreover, our previous Synchrotron experiments indicate that two space groups are possible : Pna21 and Pnna, and we are confident that NPD can solve this issue. Secondly, these samples are antiferromagnetic and Squid measurements indicate a long range magnetic order below 25K. We would like to study the magnetic structures of all these new compounds in order to get a detailed view on the iono-covalency of these compounds, which dictates both the redox potential of the battery and the magnetic structure which develops at low temperature.
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ROUSSE Gwenaelle; BARNARD Arthur; CHOTARD Jean Noel; Thomas C. Hansen; Marine REYNAUD; RODRIGUEZ-CARVAJAL Juan; TARASCON Jean-Marie and VENKATA SUBBAN Chinmayee. (2013). Crystallographic and magnetic study of new potassium-based fluorosulfates for Li-ion batteries. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2289
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