Furukawa-Sky Review No.5 (April 2009)

  • ツイートする
  • facebookでシェアする


Aluminum Foil for Lithium-Ion Battery

Full Text PDF(PDFファイルを開きます909KB)

  • 芦澤 公一
    Koichi Ashizawa
  • 山本 兼滋
    Kenji Yamamoto


Aluminum foil is the one and only, irreplaceable material for the positive electrode collector of lithium-ion batteries, where it serves to retain positive electrode active materials and to supply electric current to the positive electrode materials. This article describes the reasons why this familiar material of aluminum foil can be used as a constituting material of lithium-ion batteries. Firstly, an aluminum foil is never doped with lithium ions when used as a positive electrode collector. If it were doped, it would become too brittle to function as a current collector. Although aluminum itself allows easy doping with lithium ions, it is never doped in the potential range in use as a positive electrode collector. Second, aluminum is corrosion-resistant. While the surface of aluminum is covered with a corrosion-resistant film of natural oxide, an aluminum fluoride of higher corrosion resistance is additionally formed during the time of the first battery charging. Third, the surface of an aluminum foil is electrically conductive. This means that, whether the electric conductivity is attributable to the theory of surface defect or to the theory of tunneling effect, there exists on the surface of an aluminum foil a film having characteristics capable of supplying a large electric current.

Get Adobe Reader

PDFをお読みいただくにはAdobe Readerが必要です。