Disclosed is a power storage element including a positive electrode current collector layer and a negative electrode current collector layer which are arranged on the same plane and can be formed through a simple process. The power storage element further includes a positive electrode active material layer on the positive electrode current collector layer; a negative electrode active material layer on the negative electrode current collector layer; and a solid electrolyte layer in contact with at least the positive electrode active material layer and the negative electrode active material layer. The positive electrode active material layer and the negative electrode active material layer are formed by oxidation treatment.

An all-solid-state battery is provided that includes a cathode layer, an anode layer, and a solid electrolyte layer, in which a porosity of the solid electrolyte layer is equal to or less than 10%. Moreover, the batter includes a surface roughness Rz1 of the cathode layer and a surface roughness Rz2 of the anode layer, such that Rz1+Rz2≤25.

An all-solid-state battery is provided that includes a cathode layer, an anode layer, and a solid electrolyte layer, in which a porosity of the solid electrolyte layer is equal to or less than 10%. Moreover, the batter includes a surface roughness Rz1 of the cathode layer and a surface roughness Rz2 of the anode layer, such that Rz1+Rz2≤25.

An electrical double layer capacitor having electrolyte-containing layer between a first polarizable electrode layer and a second polarizable electrode layer. An insulating adhesive portion adheres to a first current collector and a second current collector which at least partially face each other with the electrolyte-containing layer interposed therebetween. The insulating adhesive portion 15 extends around the first and second polarizable electrode layers and the electrolyte-containing layer. A thickness of the electrolyte-containing layer is larger than a difference between a thickness of the insulating adhesive portion and thicknesses of the first and second polarizable electrode layers.

Provided is a solid electrolyte laminated sheet having a self-supporting property and capable of realizing a solid state battery having high output characteristics. A plurality of supports are used, a solid electrolyte is filled in each support to form a self-supporting sheet, and the self-supporting sheets are superimposed to form a solid electrolyte laminated sheet. Specifically, the solid electrolyte laminated sheet is configured by setting a layer of the solid electrolyte laminated sheet in contact with a positive electrode layer being the outermost layer as a self-supporting sheet in which a solid electrolyte resistant to oxidation is filled, and a layer in contact with a negative electrode layer being the opposite outermost layer as a self-supporting sheet in which a solid electrolyte resistant to reduction is filled.

Provided is a solid electrolyte laminated sheet having a self-supporting property and capable of realizing a solid state battery having high output characteristics. A plurality of supports are used, a solid electrolyte is filled in each support to form a self-supporting sheet, and the self-supporting sheets are superimposed to form a solid electrolyte laminated sheet. Specifically, the solid electrolyte laminated sheet is configured by setting a layer of the solid electrolyte laminated sheet in contact with a positive electrode layer being the outermost layer as a self-supporting sheet in which a solid electrolyte resistant to oxidation is filled, and a layer in contact with a negative electrode layer being the opposite outermost layer as a self-supporting sheet in which a solid electrolyte resistant to reduction is filled.

An all solid state battery in which positional displacement of a plurality of cells arranged along a thickness direction can be prevented is provided. The all solid state battery includes a plurality of cells connected in series, wherein the all solid state battery includes a cell unit A and a cell unit B, a first current collector A in the cell A and a second current collector B in the cell B are arranged to face each other, the first current collector A includes a tab A, the second current collector B includes a tab B, and the tab A and the tab B are fixed by a fixing portion.

An all solid state battery in which positional displacement of a plurality of cells arranged along a thickness direction can be prevented is provided. The all solid state battery includes a plurality of cells connected in series, wherein the all solid state battery includes a cell unit A and a cell unit B, a first current collector A in the cell A and a second current collector B in the cell B are arranged to face each other, the first current collector A includes a tab A, the second current collector B includes a tab B, and the tab A and the tab B are fixed by a fixing portion.

Provided is an electrode laminate for all-solid-state batteries, which is configured to suppress the occurrence of short circuits in all-solid-state batteries and/or to suppress a decrease in the durability of all-solid-state batteries, and which is configured to suppress an increase in the resistance value of all-solid-state batteries. Disclosed is an electrode laminate for all-solid-state batteries, comprising: a current collector complex comprising adhesive portions and a current collector portion that comprises at least a current collector, and an active material layer disposed on the current collector complex, wherein an active material layer-side main surface of the current collector portion and active material layer-side main surfaces of the adhesive portions are formed to be one flat surface, and the current collector portion and the active material layer are attached by the adhesive portions.

Provided is an electrode laminate for all-solid-state batteries, which is configured to suppress the occurrence of short circuits in all-solid-state batteries and/or to suppress a decrease in the durability of all-solid-state batteries, and which is configured to suppress an increase in the resistance value of all-solid-state batteries. Disclosed is an electrode laminate for all-solid-state batteries, comprising: a current collector complex comprising adhesive portions and a current collector portion that comprises at least a current collector, and an active material layer disposed on the current collector complex, wherein an active material layer-side main surface of the current collector portion and active material layer-side main surfaces of the adhesive portions are formed to be one flat surface, and the current collector portion and the active material layer are attached by the adhesive portions.