Electric double layer capacitor, lithium ion capacitor, and charging device

A device comprising:

• an electric double layer capacitor;
• a solar cell;
• and
• wirings electrically connected to the electric double layer capacitor,
• wherein the electric double layer capacitor comprises:
• a first substrate and a second substrate facing each other, wherein each of the first substrate and the second substrate is transparent to visible light;
• a pair of current collectors between the first substrate and the second substrate, wherein the pair of current collectors are provided so as to be perpendicular to the first substrate and the second substrate;
• a first active material layer provided on a plane of one of the pair of current collectors and a second active material layer provided on a plane of the other of the pair of current collectors, wherein the planes face each other;
• and
• an electrolyte provided in a region surrounded by the first substrate, the second substrate, the first active material layer, and the second active material layer,
• wherein the solar cell comprises, over a third substrate which is transparent to visible light, a first conductive film which is transparent to visible light, a photoelectric conversion layer provided in contact with the first conductive film, and a second conductive film which is transparent to visible light and provided in contact with the photoelectric conversion layer, and
• wherein the electric double layer capacitor and the solar cell are electrically connected to each other through the wirings, the first conductive film, and the second conductive film.

A lithium ion capacitor comprising:

• a first substrate and a second substrate facing each other, wherein each of the first substrate and the second substrate is transparent to visible light;
• a positive electrode comprising a positive electrode current collector and a positive electrode active material layer and a negative electrode comprising a negative electrode current collector and a negative electrode active material layer between the first substrate and the second substrate, wherein the positive electrode and the negative electrode are provided so as to be perpendicular to the first substrate and the second substrate;
• and
• an electrolyte provided in a region surrounded by the first substrate, the second substrate, the positive electrode active material layer, and the negative electrode active material layer.

A device comprising:

• a lithium ion capacitor;
• a solar cell;
• and
• wirings electrically connected to the lithium ion capacitor,
• wherein the lithium ion capacitor comprises:
• a first substrate and a second substrate facing each other, wherein each of the first substrate and the second substrate is transparent to visible light;
• a positive electrode comprising a positive electrode current collector and a positive electrode active material layer and a negative electrode comprising a negative electrode current collector and a negative electrode active material layer between the first substrate and the second substrate, wherein the positive electrode and the negative electrode are provided so as to be perpendicular to the first substrate and the second substrate;
• and
• an electrolyte provided in a region surrounded by the first substrate, the second substrate, the positive electrode active material layer, and the negative electrode active material layer, and
• wherein the solar cell comprises, over a third substrate which is transparent to visible light, a first conductive film which is transparent to visible light, a photoelectric conversion layer provided in contact with the first conductive film, and a second conductive film which is transparent to visible light and provided in contact with the photoelectric conversion layer, and
• wherein the lithium ion capacitor and the solar cell are electrically connected to each other through the wirings, the first conductive film, and the second conductive film.