High density lithium cobalt oxide for rechargeable batteries

C - Chemistry – Metallurgy – 01 – G

Patent

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Details

C01G 51/00 (2006.01) H01M 4/02 (2006.01) H01M 4/52 (2010.01)

Patent

CA 2691798

The disclosure relates to positive electrode material used for Li-ion batteries, a precursor and process used for preparing such materials, and Li-ion battery using such material in its positive electrode. The disclosure describes a higher density LiCoO2 positive electrode material for lithium secondary batteries, with a specific surface area (BET) below 0.2 m2/g, and a volumetric median particle size (d50) of more than 15µm. This product has, improved specific capacity and rate-capability. Other embodiments of the disclosure are an aggregated Co (OH)2, which is used as a precursor, the electrode mix and the battery manufactured using abovementioned LiCoO2.

L'invention concerne un matériau d'électrode positive utilisé pour des batteries Li-ion, un précurseur et un procédé utilisés pour la préparation de ces matériaux ainsi qu'une batterie Li-ion dont l'électrode positive est faite dudit matériau. L'invention décrit un matériau d'électrode positive LiCoO2 à densité supérieure pour batteries secondaires au lithium dont la surface spécifique (BET) est inférieure à 0,2 m?/g, et la taille de particule médiane en volume (d50) est supérieure à 15 µm. Ce produit possède une capacité spécifique et des possibilités nominales améliorées. D'autres modes de réalisation de l'invention sont un composé Co(OH)2 agrégé utilisé en tant que précurseur, le mélange d'électrode et la batterie fabriquée à l'aide du LiCoO2 mentionné plus haut.

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