Synthesis of lithium nickel cobalt dioxide

C - Chemistry – Metallurgy – 01 – G

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C01G 53/04 (2006.01) C01G 51/04 (2006.01) C01G 53/00 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2262521

A single calcination stage process for the synthesis of homogeneous crystalline lithium nickel cobalt dioxide from either a mechanical mixture of nickel and cobalt oxides, hydroxide or oxyhydroxide or a chemical precipitation of a homogeneous nickel cobalt hydroxide or cobalt nickel cobalt oxyhydroxide is provided. The reactants are calcined in the presence of lithium hydroxide and an alkali metal hydroxide under predetermined oxygen partial pressure and temperature conditions. The products of the process are characterized in having a lithium to transition metal ratio closely approximating to the desired theoretical value.

L'invention porte sur un procédé de calcination en une seule étape aux fins de la synthèse de lithium-nickel-cobalt, que ce soit à partir d'un mélange mécanique d'oxydes, d'hydroxyde ou d'oxyhydroxyde de nickel et de cobalt ou par précipitation chimique d'un hydroxyde homogène de nickel-cobalt ou d'un oxyhydroxyde de cobalt-nickel-cobalt. On calcine les substances réagissantes en présence d'hydroxyde de lithium et d'un hydroxyde de métal alcalin sous une pression partielle d'oxygène et à une température prédéfinies. Les produits obtenus grâce à ce procédé se caractérisent par le fait que la valeur du rapport lithium métal de transition est très proche de la valeur théorique désirée.

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