Three-electron reversible redox for a high-energy fluorophosphate cathode: Na3V2O2(PO4)2F

A three-electron structural reaction for Na3V2O2(PO4)2F (Na3VOPF) in space group I4/mmm shows a priori stabilisation in terms of long-life in the voltage range of 2.0–4.5 V, with embedding of more than one sodium ion to generate Na5VOPF upon discharge to 1.0 V in the first cycle, thereby increasing...

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Published inChemical communications (Cambridge, England) Vol. 55; no. 27; pp. 3979 - 3982
Main Authors Peng, Manhua, Zhang, Dongtang, Wang, Xiayan, Xia, Dingguo, Sun, Yugang, Guo, Guangsheng
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2019
Subjects
Cathodes
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Summary:A three-electron structural reaction for Na3V2O2(PO4)2F (Na3VOPF) in space group I4/mmm shows a priori stabilisation in terms of long-life in the voltage range of 2.0–4.5 V, with embedding of more than one sodium ion to generate Na5VOPF upon discharge to 1.0 V in the first cycle, thereby increasing the specific capacity from ∼170 mA h g−1. The capacity of the crystals was 180 mA h g−1 after 20 cycles. The results provide a probable route to improve fluorophosphate cathode performance.
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ISSN:1359-7345
1364-548X
DOI:10.1039/c9cc00504h