Method for improvement of performance of si thin film anode...

H - Electricity – 01 – M

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H01M 4/04 (2006.01)

Patent

CA 2579377

The present invention relates to a method for improving charge/discharge cycle characteristics of a lithium secondary battery using a Si based anode active material, the method comprising surface-treating a surface of an anode current collector to have specific morphology, and preferably vapor-depositing a silicon film, as the anode active material by sputtering under application of bias voltage to the surface-treated anode current collector, and/or disposing an adhesive layer between the surface-treated anode current collector and silicon film, so as to reinforce bondability between the anode current collector and active material, ultimately leading to improvement of charge/discharge characteristics of the battery.

La présente invention a trait à un procédé pour l'amélioration de caractéristiques de cycles de charge/décharge d'une batterie secondaire au lithium utilisant un matériau actif d'anode à base de silicium, le procédé comprenant le traitement de surface d'une surface d'un collecteur de courant anodique pour lui procurer une morphologie spécifique, et de préférence le dépôt en phase vapeur d'un film de silicium, comme matériau actif de l'anode par la pulvérisation cathodique sous l'application d'une tension de polarisation au collecteur de courant anodique à surface traitée, et/ou le placement d'une couche adhésive entre le collecteur de courant anodique à surface traitée et le film de silicium, en vue de renforcer l'adhérence entre le collecteur de courant anodique et le matériau actif, entraînant finalement l'amélioration des caractéristiques de charge/décharge de la batterie.

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