Porous conductor having conductive nanostructure and electricity storage device using same
To provide an electrode for an electricity storage device, which electrode employs a porous conductor having conductive nanostructures formed on its surface and makes it possible to provide a less expensive electricity storage device having a high discharge capacity and high charge/discharge cycle resistance. A porous conductor which is used as an electrode for an electricity storage device has a plurality of conductive nanostructures on a surface of the porous conductor.
1. A porous conductor comprising:
a substrate; and
a plurality of conductive nanostructures present on the substrate,
wherein the substrate is a sintered metal fiber sheet that is formed with metal fibers such that a plurality of holes is formed among the metal fibers, wherein an average diameter of the holes is ranged from 1 to 300 μm, and the average diameter of the holes are calculated using at least fifty of the holes and referring to a longest diameter of each of the holes,
wherein the conductive nanostructures include metal,
wherein the shape of the conductive nanostructures is a dendrite,
wherein the conductive nanostructures are directly attached to the metal fibers included in the metal fiber sheet.
2. The porous conductor according to claim 1 , wherein the metal fiber sheet includes a stainless steel fiber or a copper fiber.
3. The porous conductor according to claim 1 , wherein the metal is at least one or more of silver, copper, and cobalt.
4. An electricity storage device comprising the porous conductor according to claim 1 functioning as an electrode.
5. The electricity storage device according to claim 4 , wherein the electricity storage device is a redox capacitor.