Electricity storage device

摘要

An object is to improve characteristics of a power storage device. The present invention relates to an electricity storage device comprising a current collector and a negative electrode-active material layer formed over the current collector. The negative electrode-active material layer includes a negative electrode comprising a first negative electrode layer in contact with the current collector; a second negative electrode layer in contact with the first negative electrode layer, having a smaller capacitance than the first negative electrode layer and containing one material selected from a nitride of lithium and a transition metal represented by LiaMbNz (M is a transition metal, 0.1≦a≦2.8, 0.2≦b≦1 and 0.6≦z≦1.4), a silicon material, and lithium titanate; a positive electrode that is paired with the negative electrode; and a solid electrolyte interposed between the positive electrode and the negative electrode.

主权项

1. An electricity storage device comprising:
a current collector in a plate-like form; and a negative electrode-active material layer formed on the current collector, the negative electrode-active material layer having a laminate structure comprising:
a first negative electrode layer over the current collector, the first negative electrode layer comprising a carbon material or a composite material containing carbon; anda second negative electrode layer over the first negative electrode layer, the second negative electrode layer containing a nitride of lithium and a transition metal represented by LiaMbNz, where M represents the transition metal, a is 0.1 or more and 2.8 or less, b is 0.2 or more and 1.0 or less, and z is 0.6 or more and 1.4 or less, wherein the current collector, the first negative electrode layer and the second negative electrode layer are discretely laminated on one another, and wherein the first negative electrode layer is interposed between the current collector and the second negative electrode layer.