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

研究成果: Article査読

17 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)4926-4934
ページ数9
ジャーナルChemistry of Materials
30
15
DOI
出版ステータスPublished - 2018 8月 14
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 材料化学

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