Aluminum foil with improved wettability
AssigneeSpeira GmbH
InventorsStephan Draese, Thomas Graf, Oliver Seiferth, Volker Schmitz
Life of this patent
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Abstract
An aluminum foil is formed from an alloy of type AA1xxx, AA3xxx, and/or AA8xxx, which has a cold-solidified state and contains on its surface a rolling oil layer with a polyalkylene glycol or a compound containing a polyalkylene oxide structure. The aluminum foil has a thickness of 4 μm to 100 μm and can be easily coated with an electrode suspension for producing a battery film.
Claims8
An aluminum foil having a thickness of 4 μm to 100 μm formed from an alloy of type AA1xxx, AA3xxx, and/or AA8xxx, which has a cold-solidified state, and which has on its surface a rolling oil layer which contains a polyalkylene glycol and/or a compound containing a polyalkylene oxide structure, wherein the alkylene group in the polyalkylene glycol or polyalkylene oxide is ethylene, propylene or butylene and the polyalkylene glycol or the compound containing a polyalkylene oxide structure is contained on a surface side of the aluminum foil in an amount of 0.01 mg/m2 to 5 mg/m2, and wherein the proportion of the polyalkylene glycol or the compound containing a polyalkylene oxide structure in the rolling oil layer is up to 10 wt. % in relation to the mass of the rolling oil layer.
A method for producing a battery film, comprising:
- subjecting an aluminum strip of an alloy of type AA1xxx, AA3xxx, and/or AA8xxx in the presence of a cooling lubricant to a cold rolling to form an aluminum foil of a thickness of 4 μm to 100 μm, wherein the cooling lubricant is based on a mineral oil or a synthetic oil, polyalkylene glycol and/or a compound containing a polyalkylene oxide structure, wherein the alkylene group in the polyalkylene glycol or polyalkylene oxide is ethylene, propylene or butylene, and contains a fatty acid as lubricating additive in a proportion of at most 0.2 wt. % and a fatty alcohol as lubricating additive in a proportion of at most 0.4 wt. %, in relation to the mass of the cooling lubricant, and
- coating the surface of the aluminum foil with an electrode coating mass,
- wherein the polyalkylene glycol or the compound containing a polyalkylene oxide structure is contained on a surface side of the aluminum foil in an amount of 0.01 mg/m2 to 5 mg/m2, and
- wherein the proportion of the polyalkylene glycol or the compound containing a polyalkylene oxide structure in the cooling lubricant is up to 10 wt. % in relation to the mass of the rolling oil.
Dependencies are inferred from the claim text.