Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 16, Issue 5, Pages 1743-1751Publisher
SPRINGER
DOI: 10.1007/s10008-011-1598-y
Keywords
Conductivity; Fluorosulphates; Ionic liquid grafting; Solid electrolyte
Categories
Funding
- ALISTORE-ERI
- Japan Society for the Promotion of Science at University of Tokyo
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Recently unveiled 'alkali metal fluorosulphate (AMSO(4)F)' 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 a parts per thousand currency sign 300 A degrees 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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