ALUMINUM ALLOY FOIL FOR LITHIUM ION BATTERY ELECTRODE CHARGE COLLECTOR

• Main Authors: HIBINO ATSUSHI, TAKIGUCHI KOICHIRO
• Format: Patent
• Language: English
• Published: 08.07.2010
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide an aluminum foil for a lithium ion battery electrode charge collector which has sufficient tensile strength upon the application of an active material, drying and rolling upon electrode production, and, by performing heat treatment at a relatively low temperature of ≤200°C after that, has sufficient elongation upon coiling of a positive electrode and a negative electrode and when being assembled into a battery as an electrode, and can prevent deterioration and fracture of the positive electrode even upon repetition of charging-discharging as a battery. SOLUTION: The aluminum alloy foil has a composition containing 0.8 to 2.0% Fe and ≤0.02% Ti, wherein, as impurities, the content of Si is regulated to ≤0.15% and the content of Cu is regulated to ≤0.05%, and the balance Al with the other inevitable impurities, wherein the tensile strength is ≥160 MPa, and the electric resistance measured in liquid nitrogen by a double bridge process is ≤0.55 μΩcm. COPYRIGHT: (C)2010,JPO&INPIT