Alkaline Electrochemical Capacitor and Electrode Fabrication

摘要

Highly capacitive (high surface area) electrodes that are electrochemically stable in strong alkaline electrolyte will form the basis for a new generation of electrical and electrochemical energy storage and conversion devices. A new type of electrochemical capacitor is described in addition to procedures for making the required electrodes. The subject low cost alkaline electrochemical capacitor designs are based upon titanium nitride electrodes which exhibit 125 mF/sq cm surface capacitance density and remarkable electrochemical stability over a relatively wide (-55 deg C to +100 deg C) temperature range in aqueous potassium hydroxide of approximately 15 pH alkalinity. With energy density in excess of 300 mJ/cc and the potential to exceed a power density of 100 W/cc, the alkaline electrochemical capacitor represents a significant advancement in technology for high power energy storage.