Patent ID: 8034483

Claim:
An anode for a lithium-ion secondary battery comprising a current collector, and an active material-containing layer formed on the current collector, wherein the active material-containing layer is comprised of an outermost layer disposed on the farthest side from the current collector, and a lower layer composed of at least one layer disposed between the outermost layer and the current collector, the outermost layer having a structure in which active material particles are bound by a binder and the lower layer having a structure in which active material particles are bound by a binder, and wherein a degree of flexion of the outermost layer is smaller than a degree of flexion of the lower layer, the degree of flexion of the outermost layer and the degree of flexion of the lower layer being defined as a ratio: L′/L, where L is a thickness of a layer, which is any of the outermost layer and the lower layer, obtained by drawing a straight line A perpendicular to the layer, and L′ is a numerical value, in the same unit as L, of a sum of maximum diameters of active material particles crossing the straight line A in a lateral direction perpendicular to the straight line A.