Carbon fibre containing negative electrode for lithium battery

H - Electricity – 01 – M

Patent

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Details

H01M 4/62 (2006.01) H01M 4/66 (2006.01) H01M 4/58 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2438131

The invention basically comprises the addition of a small amount of manometer sized carbon tubes or fibres grown by high temperature . vapour deposition to a meso-phase graphite mixture used for a negative electrode (anode) for a lithium battery. These are referred to herein as "carbon namo-fibres". According to one embodiment of the present invention, in an anode for a lithium battery having a conductive substrate coated with a pressed compact of spherical graphite and an ion-conducting polymeric binder, an amount of from 1.5 to 15% by weight of carbon namo-fibres is added. The carbon namo-fibres may have an average diameter of around 0.2mm (200 x 10-9m) a length of from 10 to 20mm and an inner core diameter of from 65-70nm. The spherical graphite may be meso-phase graphite and more preferably, the carbon namo-fibres are included in amount of from 2 to 9% by weight.

La présente invention concerne principalement l'ajout d'une faible quantité de tubes ou de fibres de carbone de taille nanométrique qu'on a fait croître par métallisation sous vide à haute température, à un mélange de graphite mésophase utilisé pour une électrode négative (anode) dans un accumulateur au lithium. Ces tubes ou fibres sont appelés 'nanofibres de carbone''. Selon une forme de réalisation de la présente invention, dans une anode d'un accumulateur au lithium comprenant un substrat conducteur recouvert d'une couche compacte comprimée de graphite sphérique et d'un liant polymère conducteur d'ions, on ajoute une quantité de nanofibres de carbone comprise entre 1,5 et 15 % en poids. Ces nanofibres de carbone peuvent présenter un diamètre moyen voisin de 0,2 mm (200 x 10-9m), une longueur comprise entre 10 et 20 mm et un diamètre de noyau interne compris entre 65 et 70 nm. Le graphite sphérique peut être un graphite mésophase et plus préférablement, la quantité de nanofibres de carbone ajoutée est comprise entre 2 et 9 % en poids.

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