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AssigneesBatscap, Centre National De La Recherche Scientifique
InventorsDominique Guyomard, Joël Gaubicher, Marc Deschamps, Matthieu Dubarry, Philippe Moreau
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The invention relates to a nanostructured material. The material is a nanostructured carbonaceous material composed of agglomerates of small needles of Li1+αV3O8 and of β-LixV2O5 (0.1≦α≦0.25 and 0.03≦x≦0.667) surrounded by a noncontinuous layer of spherical carbon particles. It is obtained by a process consisting in preparing a carbonaceous precursor gel by bringing carbon, α-V2O5 and a Li precursor into contact in amounts such that the ratio of the [V2O5]/[Li] concentrations is between 1.15 and 1.5 and that the (carbon)/(carbon+V2O5+Li precursor) ratio by weight is from 10 to 15 and in subjecting the gel to a heat treatment comprising a 1st stage at 80° C.-150° C. for 3-12 h and a 2nd stage between 300° C. and 350° C. for 10 min to 1 hour, under an nitrogen or argon atmosphere. Applications: positive electrode active material.
A process for the preparation of a carbonaceous material comprising preparing a carbonaceous precursor gel and subjecting said gel to a heat treatment, wherein:
A nanostructured carbonaceous material comprising agglomerates of small needles of Li1+αV3O8 and of β-LixV2O5 (0.1≦α≦0.25 and 0.03≦x≦0.667) surrounded by a noncontinuous layer of spherical carbon particles, wherein
Dependencies are inferred from the claim text.