Supercapacitor Devices Having Composite Electrodes Formed By Depositing Metal Oxide Pseudocapacitor Materials Onto Carbon Substrates

摘要

Supercapacitors have composite electrodes that include a porous carbonaceous material such as graphene onto which a metal oxide pseudocapacitor material is deposited in the form of nano-scale particles or a nano-scale film. The composite electrodes exhibit excellent specific capacitance, even at high scan rates.

主权项

1. A supercapacitor comprising at least two electrodes, each electrode being in electrical contact with an electrically conductive current collector, said electrodes being spaced apart and having an electrolyte interposed between and in contact with each of said electrodes, wherein at least one of the electrodes is a composite of a porous carbonaceous material having a metal oxide pseudocapacitor material deposited thereon and chemically bonded to the carbonaceous material, the metal oxide pseudocapacitor material being in the form of a continuous, conformal film having a thickness of from 0.5 nm to 25 nm and constituting 25 to 95% of the weight of the composite, and wherein the composite has a surface area of at least 25 m2/g.