Anode active material, its producing process, and lithium...

Details Anode active material, its producing process, and lithium... Anode active material, its producing process, and lithium...

H - Electricity

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H01M 4/02 (2006.01) H01M 4/04 (2006.01) H01M 4/58 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01) H01M 4/52 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2247350

A process for producing anode active material with uniform composition easily with high mass-productivity, an anode active material produced by the method, and a lithium ion secondary cell are disclosed. Aqueous solutions of lithium nitrate, cobalt nitrate and tartaric acid are prepared. After the aqueous solutions are mixed at a stoichiometric ratio of the active material, moisture is removed from the mixture by spray-drying to obtain a precursor. The precursor is baked. By using the obtained anode active material layer for an anode, a high performance lithium ion secondary cell can be obtained.

Procédé servant à fabriquer un matériau anodique actif présentant une composition uniforme, avec un rendement élevé, matériau anodique actif fabriqué au moyen de ce procédé et pile secondaire aux ions lithium. On prépare des solutions aqueuses de nitrate de lithium, de nitrate de cobalt et d'acide tartarique. Après mélange de ces solutions aqueuses selon un rapport stoechiométrique du matériau actif, on supprime l'humidité du mélange au moyen d'un séchage par pulvérisation afin d'obtenir un précurseur. On cuit ce précurseur. L'utilisation d'une couche de ce matériau anodique actif permet de préparer une pile secondaire au lithium à capacité élevée.

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