NMR study on the Li diffusion in a cathode material of amorphous vanadium pentoxide-5 mol% phosphorus pentoxide

Takeshi Asai, Shoji Sugimoto, Shichio Kawai, Shigeto Okada, Jun ichi Yamaki

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Diffusion properties of Li ion in a cathode material of amorphous LixV2O5 with 5 mol% P2O5 (x=0.2-2) were studied by means of 7Li NMR. From the relaxation time, T1ρ{variant}, the diffusion coefficient at 25°C was obtained to be 4×10-14cm2s-1 for x=0.2 and 2.8×10-12cm2s-1 for x=2. Both pre-exponential factor, D0, and the activation energy, Ea, of the diffusion coefficient decreased with the increase of x. From the second moment, Li+ ions seemed to occupy sites approximately 2.9 A apart in a large cavity similar to that in the crystalline V2O5. It was suggested that there are three kinds of sites for the Li+ ion in the cavity, and that the ion changes the site of one kind to the others at x{reversed tilde equals}0.6.

Original languageEnglish
Pages (from-to)75-82
Number of pages8
JournalMaterials Research Bulletin
Volume24
Issue number1
DOIs
Publication statusPublished - Jan 1989

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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