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Article Dans Une Revue Inorganic Chemistry Année : 2023

Strategies to Achieve Stable Manganese Oxyfluorides by Tuning the Reactivity of Pure Molecular Fluorine

Jérémie Auvergniot
  • Fonction : Auteur
Pierre-Etienne Cabelguen
Fabienne Gschwind
  • Fonction : Auteur
Marc Dubois

Résumé

Thanks to their high initial electrochemical properties and broad compositional flexibility, lithium-rich disordered rocksalt cathode-active materials including high-performance manganese-only materials appear as a potential replacement to the cobalt-based current market leader “NMC” material. The main issue with these materials is their lack of stability. However, recent works have identified bulk fluorination as a potential solution to stabilize these compounds. There is, however, a clear lack of diversity in fluorination agents used to synthesize these disordered rocksalts, as most publications used LiF, a very stable compound. To achieve manganese-only materials, manganese oxyfluorides represent promising precursors, but the literature reports only MnO3F and Mn2O2F9, which are both unstable and hazardous. The present study develops several strategies for synthesis and a tailored characterization methodology to explore the chemical space of direct fluorination of manganese oxide MnO with molecular fluorine and shows how to tune its reactivity to achieve a range of novel, safe, and finely tunable manganese oxyfluorides of general formula MnOFx, with x going from 0 to 1 synthesized via a fluorine insertion mechanism.

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Chimie
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Dates et versions

hal-04438829 , version 1 (05-02-2024)

Identifiants

Citer

Sebastien de Windt, Jérémie Auvergniot, Pierre-Etienne Cabelguen, Fabienne Gschwind, Marc Dubois, et al.. Strategies to Achieve Stable Manganese Oxyfluorides by Tuning the Reactivity of Pure Molecular Fluorine. Inorganic Chemistry, 2023, 62 (48), pp.19612-19621. ⟨10.1021/acs.inorgchem.3c02982⟩. ⟨hal-04438829⟩
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