Method for preparing a lithium and vanadium oxide of the...

C - Chemistry – Metallurgy – 01 – G

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C01G 31/00 (2006.01)

Patent

CA 2553821

The invention relates to a method for preparing a lithium and vanadium oxide and the thus obtained products consisting in preparing a precursor gel by reacting hydrogen peroxide with V2O5-.alpha. in an aqueous medium in the presence of a lithium precursor and in exposing said gel to a heat treatment in an oxidant atmosphere at a temperature ranging from 260 °C to 580 °C. A compound of a formula Li1+.alpha. V3O8, (0,1=.alpha.= 0,25) consists of needle-shaped grains having a bimodal distribution, wherein the length (L) of the first distribution needles ranges from 10 to 50 µm and the length (L) of the second distribution needles ranges from 1 to 10 µm. When l is the grain width, L the length and e the thickness thereof, said dimensions are such as 4<L/l<100 et 4<L/e<100.

La présente invention concerne un procédé de préparation d'un oxyde de lithium et de vanadium, ainsi que le produit obtenu. Le procédé consiste à préparer un gel précurseur par réaction de peroxyde d'hydrogène avec V2O5-.alpha. en milieu aqueux, en présence d'un précurseur de lithium, puis à soumettre ledit gel à un traitement thermique sous atmosphère oxydante à une température entre 260~C et 580~C. Le composé répondant à la formule Li1+.alpha. V3O8, (0,1<=.alpha.<= 0,25) est constitué de grains en forme d'aiguilles présentant une répartition bimodale, les aiguilles d'un premier mode ayant une longueur L de 10 à 50 ~m, les aiguilles d'un second mode ayant une longueur L de 1 à 10 ~m. Si l est la largeur des grains, L leur longueur et e leur épaisseur, ces dimensions sont telles que 4<L/l<100 et 4<L/e<100.

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