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High-performance Electrochemical Capacitors

Nanoscale metal oxide coatings on 3D carbon nanoarchitectures

Naval Research Laboratory

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PDF Document PublicationENE05FactSheet (310 KB)

Technology Marketing Summary

A capacitor comprising an anode, cathode, and an electrolyte, wherein the anode, the cathode, or both comprise a composite of porous carbon structure with a coating on the surface of MnO2, and a current collector in electrical contact with the composite

DescriptionNRL has developed scalable, solution-based benchtop methods to generate conformal ultrathin (<20-nm thick) metal oxides on the high-surface-area walls of carbon nanofoam papers (0.1–0.3 mm thick).  The resulting ultrathin oxides of manganese (Mn) or iron (Fe) rapidly take up and release electrons and ions, thereby storing energy at 300–600Farads per gram of oxide (with typical oxide loadings of up to 50 wt. %), while the carbon nanofoam paper serves as a 3-dimensional current collector and defines a pre-selected porous electrode architecture.  The high surface-to-volume ratio of oxide-painted carbon nanofoam enables footprint-normalized capacitances of 1–10Fcm-2 addressable within tens of seconds, a time scale of relevance for hybrid EVs.  Pairing MnOx–carbon nanofoam with FeOx–carbon nanofoam yields an energy-storage device with an extended operating voltage in mild aqueous electrolytes (~2V) that provides technologically relevant energy and power density while also being low cost, safe to operate, and environmentally benign.Benefits

Device-ready electrode structures that exhibit up to 10-fold increased electrochemical charge storage.

The combination of high-performance electrode materials and aqueous electrolytes results in energy-storage devices that are:

  • Low Cost
  • Safe to Operate
  • Environmentally Benign
  • Relevant energy and power density
Applications and Industries
  • Hybrid-electric systems
  • Bridge/back-up power
  • Energy recovery
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated

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To: Cameron Childs<>