Patent ID: 9059452
Filing Date: 2015-06-16
Classification: H01M,Y02E,Y02T

Abstract:
1. An anode for a lithium ion secondary battery comprising: an anode active material layer in which a first layer and a second layer each consisting essentially of silicon and a metal element as an anode active material are alternately layered on an anode current collector, the first and second layers each having different compositions of the metal element, wherein conditional expression 1 is satisfied: where A represents a silicon content ratio in the anode active material in the first layer, and B represents a silicon content ratio in the anode active material in the second layer, wherein the silicon is contained in the anode active material in a form selected from the group consisting of: elemental silicon, a silicon compound, an alloy of silicon and mixtures thereof, and wherein the metal element is selected from the group consisting of nickel, cobalt, iron, manganese, chromium, aluminum, magnesium, molybdenum, and combinations thereof.