Carbonaceous electrode material for secondary battery and...

H - Electricity – 01 – M

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H01M 4/38 (2006.01) H01M 4/04 (2006.01) H01M 4/58 (2006.01)

Patent

CA 2131122

A non-aqueous solvent-type secondary battery having a large charge-discharge capacity and exhibiting a high utilization rate of an active substance, such as lithium, and an excellent charge-discharge cycle characteristic, can be constituted by using a carbonaceous electrode material having a specific microtexture. The carbonaceous electrode material is characterized by having an average (002)-plane spacing d002 of 0.336 - 0.375 nm and a crystallite size in c-axis direction Lc(002) of at most 50 nm, respectively, as measured by X-ray diffraction method, and an optically anisotropic texture showing a fine mosaic texture when observed through a polarizing microscope. The carbonaceous material may suitably be produced through a process including the steps of: crosslinking a tar or pitch of a petroleum or coal origin, and carbonizing the crosslinked tar or pitch at a temperature of at least 800 °C under a reduced pressure or in an inert gas atmosphere.

L'invention concerne une batterie secondaire non aqueuse, de type à solvant, ayant une grande capacité de charge/décharge et ayant un taux élevé d'utilisation d'une substance active, comme le lithium, d'excellentes caractéristiques de cycle de charge/décharge, et pouvant être constituée d'une électrode carbonée ayant une microtexture spécifique. Le matériau composant l'électrode se caractérise par un espacement moyen (d002) de plans de 0,336 à 0,375 nm et une taille de cristallite dans la direction Lc(002) de l'axe c d'au plus 50 nm, mesurés par diffraction des rayons X, et une texture optiquement anisotrope indiquant une fine texture mosaïque lorsqu'on l'observe au microscope polarisant. Le matériau carboné peut être produit par un procédé de réticulation d'un goudron ou d'un brai de pétrole ou de charbon et de carbonisation du goudron ou du brai réticulé à une température d'au moins 800 degrés Celsius à une pression réduite ou dans une ambiance de gaz inerte.

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