Anode for lithium ion secondary battery, lithium ion secondary battery, electric tool, battery car, and electric power storage system

摘要

A lithium ion secondary battery having more superior cycle characteristics is provided. The lithium ion secondary battery includes a cathode, an anode, and an electrolyte. The anode has an anode active material layer in which a first layer containing silicon as an anode active material, and a second layer containing silicon and a metal element as an anode active material are alternately layered on an anode current collector. At least one of a lamellar oxide-containing region and a lamellar nitrogen-containing region is inserted in at least one of the first layer and the second layer.

主权项

1. An anode for a lithium ion secondary battery comprising:
an anode active material layer in which a first layer containing silicon as an anode active material; and a second layer containing silicon and a metal element as an anode active material are alternately layered on an anode current collector, wherein the first layer and the second layer each include a first region and a second region, the first and second regions separated by an insertion layer comprising at least one of a lamellar oxide-containing region and a lamellar nitrogen-containing region, the at least one of the lamellar oxygen-containing region and the lamellar nitrogen-containing region extending parallel to the anode current collector, and an atomic ratio of oxygen to silicon in the oxygen-containing region or an atomic ratio of nitrogen to silicon in the nitrogen-containing region ranging from 0.01 to 0.5.