Patent ID: 7524585
Filing Date: 2009-04-28
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. An anode, comprising: an anode current collector; and an anode active material layer which is provided on the anode current collector and comprised of a first main layer formed on the anode current collector and a second main layer formed on the first main layer, wherein the anode active material layer contains tin (Sn) in the first main layer of the anode active material, and an element other than tin is a major component of the second main layer of the anode active material and which is capable of electrochemically inserting and extracting lithium (Li), and wherein said second main layer has a thickness of 2.5% - 50% relative to the thickness of the first main layer, and further wherein a concentration of tin and the element other than tin varies in the thickness direction throughout the respective layers.