The diffusion coefficient of Li+ in the γ-lithium vanadium bronze (Li1+xV3O8) has been measured with the long-pulse galvanostatic technique. Values ranging from 1.7×10-7 cm2s-1, at x=0.3, to 2.2×10-8 cm2s-1, at x= 1.4, have been measured. The thermodynamic factors, d ln a/d ln c, determined from the OCV/x curve and from voltage relaxation after the current pulse, have a mean value of ∼15. The pseudo two-phase region observed in the OCV/x curve at high Li+ concentrations seems attributable to ordering of Li+ in specific sites and to alteration of the unit cell. This process is reversible as shown by X-ray diffractometry. Finally, from OCV/t plots at different x, the partial molar entropy of Li+ was determined. The values, on account of the large dE(x)/dt measured, are higher than those found for V6O13 or TiS2. © 1987.

Pistoia, G., DI VONA, M.l., Tagliatesta, P. (1987). Transport and equilibrium characteristics of γ-lithium vanadium bronze. SOLID STATE IONICS, 24(2), 103-109.

Transport and equilibrium characteristics of γ-lithium vanadium bronze

DI VONA, MARIA LUISA;TAGLIATESTA, PIETRO
1987-01-01

Abstract

The diffusion coefficient of Li+ in the γ-lithium vanadium bronze (Li1+xV3O8) has been measured with the long-pulse galvanostatic technique. Values ranging from 1.7×10-7 cm2s-1, at x=0.3, to 2.2×10-8 cm2s-1, at x= 1.4, have been measured. The thermodynamic factors, d ln a/d ln c, determined from the OCV/x curve and from voltage relaxation after the current pulse, have a mean value of ∼15. The pseudo two-phase region observed in the OCV/x curve at high Li+ concentrations seems attributable to ordering of Li+ in specific sites and to alteration of the unit cell. This process is reversible as shown by X-ray diffractometry. Finally, from OCV/t plots at different x, the partial molar entropy of Li+ was determined. The values, on account of the large dE(x)/dt measured, are higher than those found for V6O13 or TiS2. © 1987.
1987
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/03 - CHIMICA GENERALE E INORGANICA
English
Con Impact Factor ISI
ELECTRIC BATTERIES, SECONDARY - Electrodes; IONS - Diffusion; LITHIUM COMPOUNDS - Electric Conductivity; SALTS - Thermodynamic Properties; COULOMETRIC TITRATION CURVE; LITHIUM VANADIUM BRONZE; LONG-PULSE GALVANOSTATIC TECHNIQUE; ELECTRODES, ELECTROCHEMICAL
Pistoia, G., DI VONA, M.l., Tagliatesta, P. (1987). Transport and equilibrium characteristics of γ-lithium vanadium bronze. SOLID STATE IONICS, 24(2), 103-109.
Pistoia, G; DI VONA, Ml; Tagliatesta, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/54174
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