GILLOT, F.; MÉNÉTRIER, Michel; BEKAERT, Emilie; DUPONT, L.; MORCRETTE, Mathieu; MONCONDUIT, Laure; TARASCON, Jean‐marie

doi:10.1016/j.jpowsour.2007.05.043

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GILLOT, F.
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]

MÉNÉTRIER, Michel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BEKAERT, Emilie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Power Sources. 2007, vol. 172, n° 2, p. 877-885

Elsevier

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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.< Réduire

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Ball-milling

Capacity retention

Lithium ion batteries

Vanadium diphosphides

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Vanadium diphosphides as negative electrodes for secondary Li-ion batteries

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