Synthesis, structure and electrochemical properties of LiNaCo0.5Fe0.5PO4F fluoride-phosphate

Stanislav S. Fedotov, Sergey M. Kuzovchikov, Nellie R. Khasanova, Oleg A. Drozhzhin, Dmitriy S. Filimonov, Olesia M. Karakulina, Joke Hadermann, Artem M. Abakumov, Evgeny V. Antipov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

LiNaCo0.5Fe0.5PO4F fluoride-phosphate was synthesized via conventional solid-state and novel freeze-drying routes. The crystal structure was refined based on neutron powder diffraction (NPD) data and validated by electron diffraction (ED) and high-resolution transmission electron microscopy (HRTEM). The alkali ions are ordered in LiNaCo0.5Fe0.5PO4F and the transition metals jointly occupy the same crystallographic sites. The oxidation state and oxygen coordination environment of the Fe atoms were verified by 57Fe Mössbauer spectroscopy. Electrochemical tests of the LiNaCo0.5Fe0.5PO4F cathode material demonstrated a reversible activity of the Fe3+/Fe2+ redox couple at the electrode potential near 3.4 V and minor activity of the Co3+/Co2+ redox couple over 5 V vs Li/Li+. The material exhibited the discharge capacity of more than 82% (theo.) regarding Fe3+/Fe2+ in the 2.4÷4.6 V vs Li/Li+ potential range.

Original languageEnglish
Pages (from-to)70-77
Number of pages8
JournalJournal of Solid State Chemistry
Volume242
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Fluorophosphates
  • High-voltage cathode
  • Li-ion batteries
  • Neutron diffraction

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