Centre National De La Recherche Scientifique

Batscap

Umicore

Philippe Moreau

Marc Deschamps

Dominique Guyomard

Stijn Put

Bernard Lestriez

Joël Gaubicher

Matthieu Dubarry

Nathalie Delpuech

Nicolas Dupre

Jean-Sébastien Bridel

The invention relates to a nanostructured material. The material is a nanostructured carbonaceous material composed of agglomerates of small needles of LiVOand of &#x3b2;-LiVO(0.1&#x2266;&#x3b1;&#x2266;0.25 and 0.03&#x2266;x&#x2266;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, &#x3b1;-VOand a Li precursor into contact in amounts such that the ratio of the [VO]/[Li] concentrations is between 1.15 and 1.5 and that the (carbon)/(carbon+VO+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&#xb0; C.-150&#xb0; C. for 3-12 h and a 2nd stage between 300&#xb0; C. and 350&#xb0; C. for 10 min to 1 hour, under an nitrogen or argon atmosphere. Applications: positive electrode active material.

Nanostructure material, method for the preparation thereof

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Saint Mars du Désert, France

Philippe Moreau