Electrochemical properties of nanofibers a-MoO3 as cathode materials for Li batteries

A.M. Hashem (1, 2) , H. Groult (1) , A. Mauger (3) , K. Zaghib (4) , C.M. Julien (1)

1 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques
2 National Research Centre, Inorganic Chemistry Department
3 IMPMC - Institut de minéralogie et de physique des milieux condensés
4 IREQ - Institut de Recherche d'Hydro-Québec [Varennes]

MoO3 nanofibers have been synthesized by hydrothermal reaction from acidified ammonium heptamolybdate tetrahydrate precursor. Characterization included X-ray diffraction (XRD), scanning electron microscopy (SEM), SQUID magnetometry and Raman scattering (RS) spectroscopy. Structural analysis shows that MoO3 nanofibers 50e80 nm in diameter and a several micrometers in length are grown in the orthorhombic system (Pbnm S.G.). The composition MoO2.9975 was determined by Rietveld refinement and magnetic susceptibility measurements. The electrochemical performance of Li//MoO3 cells with nanofibers deliver a better discharge capacity after 40 cycles than MoO3 bulk. Raman spectroscopy studies revealed the structural modulation upon Li intercalation in MoO3 nanofibers. The possible mechanism of intercalation is discussed.

Mots clés: Nanomaterials; Molybdenum trioxide; Cathodes; Lithium batteries; Raman spectroscopy

Domaines: Physique Quantique [quant-ph]

A.M. Hashem, H. Groult, A. Mauger, K. Zaghib, C.M. Julien. Electrochemical properties of nanofibers a-MoO3 as cathode materials for Li batteries. Journal of Power Sources, 2012, 219, pp.126-132. ⟨10.1016/j.jpowsour.2012.06.093⟩. ⟨hal-00750700⟩