Formation of Li1+nV3O8/beta-Li1/3V2O5/C nanocomposites by carboreduction and resulting improvements of the capacity retention

M. Dubarry (1) , Joël Gaubicher (1) , P. Moreau (1) , Dominique Guyomard (1)

1 IMN - Institut des Matériaux Jean Rouxel

The formation of the xerogel precursor of Li1CaV3O8 within a suspension of carbon black allows the synthesis of Li1CaCxV3O8/b-Li1/3V2O5/C nanocomposites upon heating under argon at 350 8C for a few minutes. The intimate contact of the active material with carbon particles ensures a limitation of the particle growth, a reduction–insertion of the pristine Li1CaV3O8 compound along with the formation of b-Li1/3V2O5 and an efficient electronic transport to the active materials. The electrochemical performance of these nanocomposites is significantly better than those of standard Li1CaV3O8.

Domaines: Matériaux; Science des matériaux [cond-mat.mtrl-sci]

M. Dubarry, Joël Gaubicher, P. Moreau, Dominique Guyomard. Formation of Li1+nV3O8/beta-Li1/3V2O5/C nanocomposites by carboreduction and resulting improvements of the capacity retention. Journal of Physics and Chemistry of Solids, 2006, 67, pp.1312. ⟨10.1016/j.jpcs.2006.01.090⟩. ⟨hal-00379697⟩