POROUS COLLECTOR AND ELECTRODE FOR NONAQUEOUS SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To further enhance capacity of a nonaqueous secondary battery and suppress reduction in capacity when repeating a charging/discharging cycle. SOLUTION: A fine pore having an uneven diameter of 30 nm-50 μm is formed throughout on an aluminum having a thickness ranging 10-40 μm used as a positive electrode collector for a nonaqueous secondary battery. The percentage of void representing a ratio of the volume occupied by the space including the fine pores is 15% or more to 40% or under; air permeability is 0.2 sec/100 cc to 100 sec/100cc.