Patent ID: 8932757
Filing Date: 2015-01-13
Classification: H01M,Y02E,Y02T

Abstract:
1. An anode for a lithium ion secondary battery comprising: an anode active material layer including a plurality of anode active material fibers containing silicon as an element provided on an anode current collector, wherein the anode active material layer has a multilayer structure in which a laminar first region, a laminar oxygen-containing region and a laminar second region are alternately layered, the laminar oxygen-containing region extending parallel to the anode current collector, wherein the laminar oxygen-containing region has a higher oxygen content than each of the laminar first region and the laminar second region, wherein the anode active material fibers form an S-shape in which first and second curvature sections that curve in different directions are linked together in the laminar oxygen-containing region, and wherein each of the anode active material fibers has a diameter of 50 nm or less.