C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 31/00 (2006.01)
Patent
CA 2495702
The invention relates to a method of producing a crystalline lithium/vanadium mixed oxide powder having formula Li¿1+x?V¿3?O¿8?, wherein x is between 0 and 0.2. The inventive method comprises the following steps: formation of an aqueous suspension from a NH¿4?VO¿3 ?paste and lithium hydroxide monohydrate powder; continuous dehydration of the aforementioned suspension in a stream of hot gas at a temperature of between 200 and 600 ·C in order to form a dry powder of a precursor, having a particle size of between 10 and 100 ?m; and calcination of said precursor at a temperature of between 380 and 580 ·C into a crystalline powder Li¿1+x?V¿3?O¿8?. The product thus obtained is intended, in particular, for the production of lithium rechargeable batteries and battery electrodes.
L'invention a pour objet un procédé de fabrication d'une poudre cristalline d'oxyde mixte de lithium et vanadium de formule Li1+xV3O8, x étant compris entre 0 et 0,2, comportant: la formation d'une suspension aqueuse à partir d'un pâte de NH4VO3, et de poudre de lithine mono-hydratée, la déshydratation en continu de cette suspension dans un courant de gaz chaud à une température comprise entre 200 et 600 ~C pour former une poudre sèche d'un précurseur de granulométrie comprise entre 10 et 100 µm, la calcination de ce précurseur é une température comprise entre 380 et 580 ~C en une poudre cristalline de Li1+xV3O8. Le produit obtenu est destiné notamment à la fabrication d'électrodes de piles et batteries rechargeables au lithium.
Flacher Pierre
Harabasz Arnaud
Le Mouellic Christian
Pointu Lionel
Mssa
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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