Patent ID: 9105402
Filing Date: 2015-08-11
Classification: H01G,H01M,Y02E

Abstract:
1. A method of storing charge comprising the steps of: providing a capacitor comprising an anode, a cathode, and an electrolyte, wherein the electrolyte comprises a nonaqueous liquid to dissociate salts soluble in the nonaqueous liquid, and wherein the anode, the cathode, or both comprise: a composite comprising a prefabricated porous carbon electrode structure or a carbon foam substrate that is a prefabricated paper structure comprising a surface and pores wherein the pores have an average diameter that ranges from about 2 nm to about 1 μm; and a coating deposited by infiltrating the structure with iron oxide via self-limiting electroless deposition on the surface; wherein the coating does not completely fill the pores; wherein the coating comprising iron oxide covers the interior and exterior surfaces of the porous carbon electrode structure and is continuous over the surface and is deposited in a homogenous form and is evenly distributed throughout the thickness of the carbon foam substrate that is a prefabricated paper; wherein the modifying coating of iron oxide is achieved by infiltrating the prefabricated porous carbon electrode structure that is a macroscopically thick monolithic porous electrode structure of greater than about 5 μm with an aqueous K wherein the coating has a thickness of less than about 50 nm; wherein the prefabricated porous carbon electrode structure or carbon foam substrate that is a prefabricated paper is used directly as an electrode without requiring additional conductive additives or binders to be processed into a device-suitable electrode; and a current collector in electrical contact with the composite; and charging the capacitor.