Facile topotactic synthesis of tavorite LiFeSO4F using supercritical methanol
- Facile topotactic synthesis of tavorite LiFeSO4F using supercritical methanol
- 조병원; 오시형; 김수진; 이보은; 이관영
- supercritical synthesis; methanol; lithium iron fluorosulfate; tavorite; topotactic reaction; tetraethylene glycol
- Issue Date
- Journal of power sources
- VOL 398-33
- For the first time, tavorite-structured LiFeSO4F is synthesized using supercritical methanol at 300  °C within a short reaction time of 15  min. The synthesis involves topotactic insertion of LiF in the supercritical solution into szomolnokite-type FeSO4⋅ H2O, whose structure is similar to that of the tavorite. The introduction of the co-solvent, tetraethylene glycol, solubilizes LiF partially and significantly promotes the incorporation of LiF into the structure, enabling the synthesis of highly uniform granular particles of the tavorite sized approximately 200  nm, in 15  min. The longer reaction time in supercritical methanol at 300  °C results in reduced reversible Li storage capacity and inferior cycling stability. Furthermore, the increase in the synthesis temperature results in a phase transition to triplite LiFeSO4F, which is a more thermodynamically stable phase in the synthetic temperature ranges considered. This study provides a new insight into the facile synthesis of other related fluorosulfate or fluorophosphate materials using supercritical methanol.
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