Battery including an air gap that is between a collector and solid electrolyte layer and in contact with an insulating layer

1 . A battery comprising:

an electrode layer;

a counter-electrode layer placed opposite to the electrode layer; and

a solid electrolyte layer located between the electrode layer and the counter-electrode layer, wherein the electrode layer, the counter-electrode layer, and the solid electrolyte layer are laminated in a z direction,

and wherein

the electrode layer includes the following components:

a collector,

an electrode active material layer located between the collector and the solid electrolyte layer, and

an insulating layer located between the collector and the solid electrolyte layer and bonded to the collector at ends of the electrode layer,

the electrode active material layer has a region that does not overlap the insulating layer in plan view,

and the electrode active material layer has a region that overlaps the insulating layer in plan view,

wherein the region that overlaps the insulating layer in plan view does not contribute to the charge-discharge performance of the battery,

the battery has an air gap, the air gap being located between the insulating layer and the solid electrolyte layer in the z direction such that a first side of the air gap is in contact with the insulating layer and a second side of the air gap, which is directly opposite to the first side of the air gap, is in contact with the solid electrolyte layer, and

a side surface of the collector, a side surface of the insulating layer, a side surface of the region that overlaps the insulating layer in plan view, a side surface of the solid electrolyte layer, and a side surface of the counter-electrode layer, each located at an end of the battery in a direction perpendicular to the z direction are flush with one another to form a same flat surface.

2 . The battery according to claim 1 , wherein

the electrode layer is a positive-electrode layer, and

the counter-electrode layer is a negative-electrode layer.

3 . The battery according to claim 1 , wherein the air gap is contact with the solid electrolyte layer.

4 . The battery according to claim 3 , wherein the air gap overlaps an inner end of a bonded surface between the insulating layer and the collector in plan view.

5 . The battery according to claim 1 , wherein the insulating layer contains resin.

6 . The battery according to claim 1 , wherein the insulating layer contains an inorganic filler.

7 . The battery according to claim 1 , wherein the insulating layer is higher in coefficient of linear expansion than the electrode active material layer.

8 . The battery according to claim 1 , wherein

an inner side surface of the insulating layer is in direct contact with the region of the electrode active material layer that does not overlap the insulating layer in plan view,

the inner side surface of the insulating layer is located no more than 1 mm from an outer side surface of the insulating layer, and

the outer side surface of the insulating layer is flush with an outer side surface of the collector.

9 . The battery according to claim 1 , wherein a thickness of the insulating layer is greater than or equal to 50% and less than or equal to 100% of a thickness of the electrode active material layer.

10 . The battery according to claim 1 , wherein a side surface of the battery is a cut surface.

11 . The battery according to claim 1 , wherein the insulating layer is in a shape of a frame provided on an outer periphery of the electrode layer in plan view.

12 . The battery according to claim 1 , wherein the solid electrolyte layer contains a solid electrolyte having lithium-ion conductivity.