| 摘要 |
PROBLEM TO BE SOLVED: To supply a collector for electric double layer capacitor excellent in corrosion resistance and fixing properties of electrode active material inexpensively by employing electroless etching in surface roughening. SOLUTION: An aluminum foil having a composition containing 50-500 ppm of Ni and the remainder of 99% or more of Al and unavoidable impurities and containing 10,000-1,000,000 pieces/cm<SP>2</SP>of 1-5μm diameter Al-Ni based intermetallics within the range of down to 5μm from the foil surface in the depth direction is employed. That aluminum foil is obtained by homonizing an ingot having the composition at 500-600°C and then hot rolling the ingot at start temperature of 500-590°C and finish temperature of 250-340°C. Electrode active material can be fixed firmly by performing chemical etching on the aluminum foil while immersing into solution containing nitric acid of 0.5-6 M at 40-80°C for 30-300 sec and a collector stable for electrolyte can be obtained at a low cost. COPYRIGHT: (C)2008,JPO&INPIT
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