Carbonaceous electrode material for secondary battery

H - Electricity – 01 – M

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Details

H01M 4/66 (2006.01) C01B 31/00 (2006.01) H01M 4/24 (2006.01) H01M 4/58 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2156675

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non- aqueous solvent-type secondary battery, is constituted by a carbonaceous material having a specific microtexture. The carbonaceous material is characterized by an average (002)-plane spacing of at least 0.365 nm according to X-ray diffraction method, and also a ratio ?H/?B of at least 1.15 wherein ?H denotes a density measured by using helium gas as a substitution medium and ?B denotes a density measured by using butanol as a substitution medium.

Cette invention concerne une électrode de carbone caractérisée par une capacité améliorée de dopage et de dédopage d'une substance active telle que du lithium, adaptée pour équiper une batterie secondaire du type à solvant non aqueux et fait d'une matière carbonée à microtexture précise. Elle se caractérise par un espacement moyen d'au moins 0,365 nm dans le plan (002), mesuré par la méthode de diffraction des rayons X et par un rapport ?H/?B d'au moins 1,15, ?H étant une densité mesurée à l'aide d'hélium pris comme matière de substitution et ?B, une densité mesuré avec du butanol comme matière de substitution.

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