Abstract
Vanadium oxide fluoride-graphite intercalation compounds, i.e. C x (VOF 3)F with 17.2 ≤ × ≤ 38.8, have been prepared from V 2O 5 and graphite in a fluorine atmosphere at 130°C. The structural characteristics of these compounds have been deduced from X-ray diffraction and X-ray photoelectron spectroscopy measurements. Intercalation of VOF 3 and fluorine was pointed out. The electrochemical insertion of lithium into C 17.7(VOF 3)F was investigated by chronopotentiometry and a.c. impedence spectroscopy in propylene carbonate-1 M LiClO 4. The chemical diffusion coefficient, D Li, was estimated to be close to 4.0 × 10 −10cm 2s −1 for all the values of the intercalation ratio of lithium under study (0 < y < 1.5).
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