Lithium secondary battery

Details Lithium secondary battery Lithium secondary battery

H - Electricity

01

M

H01M 4/24 (2006.01) H01M 4/02 (2006.01) H01M 4/62 (2006.01) H01M 6/12 (2006.01) H01M 4/58 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2103219

A lithium secondary battery comprises a natural graphite as a negative electrode capable of occluding and discharging lithium ion, in which the natural graphite has been heat treated at a temperature of at least 1,800°C. The heat treatment removes impurities from natural graphite. As a result, the electrolyte solution used for the battery hardly decomposes during charge and discharge and self discharge hardly occurs during storage of the battery.

Batterie secondaire au lithium comportant une électrode négative en graphite naturel capable de retenir et de décharger les ions de lithium, et dans laquelle le graphite naturel a fait l'objet d'un traitement thermique à une température d'au moins 1800 degrés Celsius. Le traitement thermique en question élimine les impuretés présentes dans le graphite naturel, en conséquence de quoi la décomposition de la solution électrolytique utilisée dans la batterie est presque nulle durant le cycle de charge-décharge, et l'autodécharge est presque nulle durant le remisage de la batterie.

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