Scalable synthesis of Na 2 MVF 7 (M = Mn, Fe, and Co) as high-performance cathode materials for sodium-ion batteries

We demonstrate an economical polytetrafluoroethylene-assisted fluorination method to synthesize three binary sodium-rich fluorides Na 2 MVF 7 (M = Mn, Fe, and Co). The optimal Na 2 FeVF 7 cathode delivers a high reversible capacity of 146.5 mA h g −1 based on active Fe 2+ /Fe 3+ and V 3+ /V 4+ redox...

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Published inChemical communications (Cambridge, England) Vol. 57; no. 87; pp. 11497 - 11500
Main Authors Liao, Jiaying, Han, Jingchen, Xu, Jianzhi, Du, Yichen, Sun, Yingying, Duan, Liping, Zhou, Xiaosi
Format Journal Article
LanguageEnglish
Published 02.11.2021
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Summary:We demonstrate an economical polytetrafluoroethylene-assisted fluorination method to synthesize three binary sodium-rich fluorides Na 2 MVF 7 (M = Mn, Fe, and Co). The optimal Na 2 FeVF 7 cathode delivers a high reversible capacity of 146.5 mA h g −1 based on active Fe 2+ /Fe 3+ and V 3+ /V 4+ redox reactions in sodium-ion batteries. A steady cycling performance with a high capacity retention of 95% over 200 cycles is achieved owing to the negligible structural change during Na + insertion/extraction.
ISSN:1359-7345
1364-548X
DOI:10.1039/D1CC04449D