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

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

H - Electricity

01

M

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

Patent

CA 2668822

A negative electrode for a lithium secondary battery obtained by integrating a mixture of a graphite particle and an organic binder together with a current collector is provided. The graphite particle has an aspect ratio of 1.2 to 5 and a crystallite size Lc in a c-axis direction of crystal (002) of 1,000 to 100,000 .ANG., and the mixture of graphite particle and an organic binder after integration with pressing has a density of 1.5 to 1.9 g/cm3. The lithium secondary battery with the negative electrode is excellent in, for example, but not limited to, rapid charge-discharge characteristics and cycle characteristics.

L'invention concerne un matériau de cathode pour une pile secondaire au lithium, lequel est obtenu en intégrant un mélange de particules de graphite, un liant organique et un collecteur de courant. Les particules de graphite ont un rapport de forme de 1,2 à 5 et une taille de cristallite Lc orientée selon l'axe c du cristal (002) de 1 000 à 100 000 Å; le mélange de particules de graphite et de liant organique intégré par pression a une densité de 1,5 à 1,9 g/cm3. La pile secondaire au lithium munie d'un matériau de cathode est excellente par exemple, mais pas exclusivement, dans les applications à cycles de chargement-déchargement rapide.

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