| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum base material for collector which allows for manufacture of a secondary battery excellent in capacity maintenance rate and cycle characteristics, and to provide a collector, a positive electrode, a negative electrode, and a secondary battery using the same.SOLUTION: In an aluminum base material for collector having a surface that is roughened at least partially, the area rate of a surface not subjected to roughening is 20% or less, and the roughened surface has recesses of average opening diameter in the range of 0.5-3.0 μm, at a density of 10 pieces/100 μmor more. |
