Graphite particles and lithium secondary cell using them as...

C - Chemistry – Metallurgy – 01 – B

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C01B 31/04 (2006.01) H01M 4/02 (2006.01) H01M 4/04 (2006.01) H01M 4/36 (2006.01) H01M 4/62 (2006.01)

Patent

CA 2558717

A graphite particle obtained by assembling or binding together a plurality of flat-shaped particles so that the planes of orientation are not parallel to one another, or a graphite particle in which aspect ratio is 5 or less or specific surface area is 8 m2/g or less or the size of crystallite in the direction of c-axis of the crystal is 500 .ANG. or more and the size of crystallite in the direction of plane is 1,000 .ANG. or less as measured by X ray broad angle diffraction, or a graphite particle in which pore volume of the pores having a size falling in a range of 10 2 to 10 6 .ANG. is 0.4 to 2.0 cc/g per weight of graphite particle or pore volume of the gores having a size falling in a range of 1 × 10 2 to 2 × 10 4 .ANG. is 0.08 to 0.4 cc/g per weight of graphite particle is suitable for production of negative electrode of lithium secondary battery, and a lithium secondary battery obtained therefrom is excellent in rapid charge-discharge characteristics, cycle characteristics, etc.

Une particule de graphite obtenue par assemblage ou par liaison de diverses particules plates de manière à ce que les plans d'orientation ne soient pas parallèles les uns aux autres, ou une particule de graphite dont le rapport de forme est de 5 ou moins, ou dont la surface spécifique est de 8 m2/g ou moins, ou dont la taille de la cristallite dans la direction de l'axe c du cristal est de 500 angström ou moins et dont la taille de la cristallite dans la direction du plan est de 1,000 angström ou moins, d'après des mesures par diffraction des rayons X à grand angle, ou une particule de graphite dans laquelle le volume de vide des pores faisant 102 à 106 angström est de 0,4 à 2,0 cc/g de particule de graphite ou dont le volume de vide des pores faisant 1 x 102 à 2 x 104 angström est de 0,08 à 0,4 cc/g de particule de graphite, convient pour la production de l'électrode négative d'une pile au lithium secondaire, et une pile au lithium secondaire ainsi obtenue possède d'excellentes caractéristiques de charge-décharge rapide, de cycle, etc.

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