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Article Dans Une Revue Journal of Power Sources Année : 2007

Vanadium diphosphides as negative electrodes for secondary Li-ion batteries

Résumé

We report on the Li electrochemical reactivity of amorphous and crystalline VP2, synthesized by ball-milling and by 600 °C heat treatment of a ball-milled sample, respectively. The amorphous sample can reversibly react with 3.5 Li per formula unit as compared to solely 2.5 for the crystalline one. However in both cases there is a rapid capacity decay upon cycling that is more pronounced in the case of the crystalline sample. Complementary X-rays, HTREM and NMR tend to show that the Li reactivity mechanism differs from the classical conversion reactions since neither V nanoparticles nor the formation of Li3P were detected, as opposed to some of the other MP2 compounds (M = Ni or Cu). Besides structural phase variations within the 3d metal-based binary phosphide series, the possibility of a change in the nature of the redox centre upon lithiation from cation (M) to anion (P) is evoked.

Domaines

Matériaux

Dates et versions

hal-00182414 , version 1 (25-10-2007)

Identifiants

Citer

F. Gillot, Michel Ménétrier, Emilie Bekaert, L. Dupont, Mathieu Morcrette, et al.. Vanadium diphosphides as negative electrodes for secondary Li-ion batteries. Journal of Power Sources, 2007, 172 (2), pp.877-885. ⟨10.1016/j.jpowsour.2007.05.043⟩. ⟨hal-00182414⟩
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