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Enabling the Li-ion conductivity of Li-metal fluorosulphates by ionic liquid grafting

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Abstract

Recently unveiled ‘alkali metal fluorosulphate (AMSO4F)’ class of compounds offers promising electrochemical and transport properties. Registering conductivity value as high as 10−7 S cm−1 in NaMSO4F phases, we explored the fluorosulphate group to design novel compounds with high Li-ion conductivity suitable for solid electrolyte applications. In the process, we produced sillimanite-structured LiZnSO4F by low temperature synthesis (T ≤ 300 °C). Examining this phase, we accidentally discovered the possibility of improving the ionic conductivity of poor conductors by forming a monolayer of ionic liquid at their particle surface. This phenomenon was studied by solid-state NMR, XPS and AC impedance spectroscopy techniques. Further, similar trends were noticed in other fluorosulphate materials like tavorite LiCoSO4F and triplite LiMnSO4F. With this study, we propose ‘ionic liquid grafting’ as an interfacial route to enable good Li-ion conductivity in otherwise poor conducting ceramics.

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Acknowledgements

The scientific assistance of Dominique Massiot (Orleans) and Danielle Gonbeau (Pau) is acknowledged. We thank ALISTORE-ERI for the financial support. The first author (PB) is grateful to the Japan Society for the Promotion of Science for a JSPS Fellowship at the University of Tokyo.

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Authors and Affiliations

  1. Laboratoire de Réactivité et Chimie des Solides, CNRS UMR 6007, Université de Picardie Jules Verne, 33, Rue Saint Leu, Amiens Cedex, 80039, France

    Prabeer Barpanda, Charles Delacourt, Marine Reynaud & Jean-Marie Tarascon

  2. Department of Chemical System Engineering, The University of Tokyo, Building 5-607, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Prabeer Barpanda & Atsuo Yamada

  3. IPREM-ECP, University of Pau, Hélioparc Pau Pyrénées, 2 av. Pierre Angot, 64000, Pau, France

    Rémi Dedryvère

  4. Cenre de Recherches sur les Materiaux a Hautes Temperatures, CNRS UPR 3079, 1D Avenue de la Recherche Scientifique, Orléans Cedex, 45071, France

    Michael Deschamps

  5. Collège de France, 11 Place Marcelin Berthelot, Paris, 745005, France

    Jean-Marie Tarascon

Authors
  1. Prabeer Barpanda
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  2. Rémi Dedryvère
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  3. Michael Deschamps
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  4. Charles Delacourt
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  5. Marine Reynaud
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  6. Atsuo Yamada
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  7. Jean-Marie Tarascon
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Corresponding author

Correspondence to Prabeer Barpanda.

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Barpanda, P., Dedryvère, R., Deschamps, M. et al. Enabling the Li-ion conductivity of Li-metal fluorosulphates by ionic liquid grafting. J Solid State Electrochem 16, 1743–1751 (2012). https://doi.org/10.1007/s10008-011-1598-y

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  • DOI: https://doi.org/10.1007/s10008-011-1598-y

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