Solid state synthesis of lithium-nickel-cobalt-manganese...

C - Chemistry – Metallurgy – 01 – G

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C01G 53/00 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2546889

Single-phase lithium-transition metal oxide compounds containing cobalt, manganese and nickel can be prepared by wet milling cobalt-, manganese-, nickel- and lithium-containing oxides or oxide precursors to form a finely- divided slurry containing well-distributed cobalt, manganese, nickel and lithium, and heating the slurry to provide a lithium-transition metal oxide compound containing cobalt, manganese and nickel and having a substantially single-phase O3 crystal structure. Wet milling provides significantly shorter milling times than dry milling and appears to promote formation of single- phase lithium-transition metal oxide compounds. The time savings in the wet milling step more than offsets the time that may be required to dry the slurry during the heating step.

L'invention concerne des composés d'oxyde de métal de transition à base de lithium à phase unique contenant du cobalt, du manganèse et du nickel, pouvant être préparés selon un procédé consistant à soumettre des oxydes ou des précurseurs d'oxydes contenant du cobalt, du manganèse, du nickel et du lithium à une mouture humide, pour former une suspension épaisse finement divisée contenant du cobalt, du manganèse, du nickel et du lithium bien distribués, puis à chauffer la suspension épaisse, pour obtenir un composé d'oxyde de métal de transition à base de lithium contenant du cobalt, du manganèse et du nickel et ayant une structure cristalline O3 sensiblement à phase unique. La mouture humide permet de réduire sensiblement le temps de mouture par rapport à la mouture sèche et favorise la formation de composés d'oxyde de métal de transition à base de lithium à phase unique. Ce gain de temps dans l'étape de mouture humide permet de compenser largement le temps nécessaire pour sécher la suspension épaisse durant l'étape de chauffage.

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