Cation-Disordered Li3VO4: Reversible Li Insertion/Deinsertion Mechanism for Quasi Li-Rich Layered Li1+ x[V1/2Li1/2]O2 (x = 0-1)

Patrick Rozier, Etsuro Iwama, Nagare Nishio, Kazuhisa Baba, Keisuke Matsumura, Kazuaki Kisu, Junichi Miyamoto, Wako Naoi, Yuki Orikasa, Patrice Simon, Katsuhiko Naoi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


The reversible lithiation/delithiation mechanism of the cation-disordered Li3VO4 material was elucidated, including the understanding of structural and electrochemical signature changes during cycling. The initial exchange of two Li induces a progressive and irreversible 7migration of Li and V ions from tetrahedral to octahedral sites, confirmed by the combination of in situ/operando X-ray diffraction and X-ray absorption fine structure analyses. The resulting cation-disordered Li3VO4 can smoothly and reversibly accommodate two Li and shows a Li+ diffusion coefficient larger by 2 orders of magnitude than the one of pristine Li3VO4, leading to improved electrochemical performance. This cation-disordered Li3VO4 negative electrode offers new opportunities for designing high-energy and high-power supercapacitors. Furthermore, it opens new paths for preparing disordered compounds with the general hexagonal close-packing structure, including most polyanionic compounds, whose electrochemical performance can be easily improved by simple cation mixing.

Original languageEnglish
Pages (from-to)4926-4934
Number of pages9
JournalChemistry of Materials
Issue number15
Publication statusPublished - 2018 Aug 14
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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