NANOSTRUCTURE MATERIAL, METHOD FOR THE PREPARATION THEREOF

摘要

The invention relates to a nanostructured material. Said material is a nanostructured carbon material consisting of agglomerates of small needles of Li₁+aV₃O₈ and ßLi_xV₂O₅ (0,l= a = 0,25 et 0,03 = x = 0,667 surrounded by a discontinuous coating of spherical carbon particles. It is obtained by means of a process consisting in preparing a carbon precursor gel by bringing carbon, V2O₅- a an a Li precursor into contact with each other, the amounts thereof being such that the ratio of concentrations [V₂O₅]/[Li] ranges from 1.15 to 1.5, and the mass ratio (carbon)/ (carbon + V₂O₅+ Li precursor) is 10 to 15, and in subjecting the gel to heat treatment including a first stage at 8O0C - 15O0C pendant 3-12 h, and a second stage between 3000C and 35O0C, during 10 mins to 1 hour, in a nitrogen or argon atmosphere. n. Applications: positive-electrode active material.