C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 31/02 (2006.01) H01M 4/131 (2010.01) H01M 4/485 (2010.01) H01M 10/056 (2010.01) C01D 15/02 (2006.01) H01M 4/36 (2006.01) H01M 4/40 (2006.01) H01M 4/13 (2010.01) H01M 10/0525 (2010.01) H01M 4/62 (2006.01)
Patent
CA 2464740
The invention relates to a lithium and vanadium oxide having formula Li¿1+x?V¿3?O¿8?, wherein 0.1 <= x <= 0.25. Said oxide has a monoclinic crystalline structure and comprises non-agglomerated grains in the form of moncrystalline pellets having a length L of between 1 and 100µm, a width l such that 4 <L/l <100, and a thickness e such that 4 L/e <100, with e < l, the elongation axis of said pellets being axis b of the monoclinic cell. The inventive oxide is prepared by mixing the Li and V precursors, without grinding or compression, heating said mixture to 565 ·C-585 ·C and de-agglomerating the product obtained. The invention is suitable for use as an active material for the positive electrode of a lithium battery.
L'invention concerne un oxyde de lithium et de vanadium. L'oxyde répond à la formule Li1+xV3O8 dans laquelle 0,1 <= x <= 0,25. Il a une structure cristalline monoclinique, et il est constitué de grains non agglomérés en forme de bâtonnets monocristallins qui ont une longueur L comprise entre 1 et 100 µ, une largeur l telle que 4 <L/e <100, et une épaisseur e telle que 4 L/e <100, avec e <l et dont l'axe d'allongement est l'axe b de la maille monoclinique. L'oxyde est préparé par un mélangeage sans broyage ni compression de précurseurs de Li et de V, chauffage à 565 ~C-585 ~C et désagglomération. Il est utile comme matière active de l'électrode positive d'une batterie au lithium.
Bourgeon Nelly
Deschamps Marc
Guyomard Dominique
Jouanneau Severine
Lascaud Stephane
Centre National de La Recherche Scientifique
Electricite de France
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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