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

doi:10.1016/0025-5408(89)90011-1

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 journal › Article › peer-review

11 Citations (Scopus)

Abstract

Diffusion properties of Li ion in a cathode material of amorphous Li_xV₂O₅ with 5 mol% P₂O₅ (x=0.2-2) were studied by means of ⁷Li NMR. From the relaxation time, T_1ρ{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, E_a, 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 language	English
Pages (from-to)	75-82
Number of pages	8
Journal	Materials Research Bulletin
Volume	24
Issue number	1
DOIs	https://doi.org/10.1016/0025-5408(89)90011-1
Publication status	Published - Jan 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.1016/0025-5408(89)90011-1

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

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.",

author = "Takeshi Asai and Shoji Sugimoto and Shichio Kawai and Shigeto Okada and Yamaki, {Jun ichi}",

year = "1989",

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doi = "10.1016/0025-5408(89)90011-1",

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T1 - NMR study on the Li diffusion in a cathode material of amorphous vanadium pentoxide-5 mol% phosphorus pentoxide

AU - Asai, Takeshi

AU - Sugimoto, Shoji

AU - Kawai, Shichio

AU - Okada, Shigeto

AU - Yamaki, Jun ichi

PY - 1989/1

Y1 - 1989/1

N2 - 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.

AB - 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.

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JO - Materials Research Bulletin

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ER -

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

Abstract

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