Kim, Su Jin Lee, Boeun Lee, Kwan-Young Cho, Byung Won Oh, Si Hyoung 2024-01-19T22:00:23Z 2024-01-19T22:00:23Z 2021-09-03 2018-09-15 0378-7753 https://pubs.kist.re.kr/handle/201004/120910 For the first time, tavorite-structured LiFeSO4F is synthesized using supercritical methanol at 300 degrees C within a short reaction time of 15 min. The synthesis involves topotactic insertion of LiF in the supercritical solution into szomolnokite-type FeSO4 center dot 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 degrees 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. English ELSEVIER SCIENCE BV LITHIUM-ION BATTERIES ENHANCED ELECTROCHEMICAL PERFORMANCE MESOPOROUS LI4TI5O12 MICROSPHERES REDUCED GRAPHENE OXIDE CATHODE MATERIALS NANOSTRUCTURED MATERIALS POSITIVE ELECTRODES TRIPLITE STRUCTURE NANOPARTICLES LI Facile topotactic synthesis of tavorite LiFeSO4F using supercritical methanol Article 10.1016/j.jpowsour.2018.07.047 1 JOURNAL OF POWER SOURCES, v.398, pp.27 - 33 JOURNAL OF POWER SOURCES 398 27 33 scie scopus 000442056800003 2-s2.0-85049779953 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article LITHIUM-ION BATTERIES ENHANCED ELECTROCHEMICAL PERFORMANCE MESOPOROUS LI4TI5O12 MICROSPHERES REDUCED GRAPHENE OXIDE CATHODE MATERIALS NANOSTRUCTURED MATERIALS POSITIVE ELECTRODES TRIPLITE STRUCTURE NANOPARTICLES LI Supercritical synthesis Methanol Lithium iron fluorosulfate Tavorite Topotactic reaction Tetraethylene glycol