Patent ID: 9577264
Date: 2017-02-21
CPC Classifications: H01M,Y02E,Y02P,Y02T

Claim:
1. An aluminum base for a current collector, comprising: a surface in which at least two structures selected from the group consisting of a large-wave structure having an average opening size of more than 5 μm but up to 100 μm, a medium-wave structure having an average opening size of more than 0.5 μm but up to 5 μm, and a small-wave structure having an average opening size of more than 0.01 μm but up to 0.5 μm are superimposed on one another, wherein each of the large-wave structure, the medium-wave structure, and the small-wave structure has alternating peaks and valleys of a continuously sinuous curve form and an overall profile of the at least two superimposed wave structures also has a continuously sinuous curve form; and, a maximum peak-to-valley height Pt of a profile curve of the surface is up to 10 μm, wherein a peak-to-valley height is measured as the height from a top of a peak of the continuously sinuous curve form to a bottom of an adjacent valley of the continuously sinuous curve form.