Development of High Energy and Power Density Solid State Supercapacitors
Navy SBIR FY2013.1

Sol No.: Navy SBIR FY2013.1
Topic No.: N131-020
Topic Title: Development of High Energy and Power Density Solid State Supercapacitors
Proposal No.: N131-020-0100
Firm: nGimat Co.
1824 Willow Trail Parkway
Norcross, Georgia 30093-2608
Contact: Yongdong Jiang
Phone: (678) 287-2477
Web Site:
Abstract: Many military and commercial applications have turned to power electronics to run a variety of systems efficiently, quietly, cheaply, and precisely. Therefore, there is an urgent need for efficient energy storage systems with both high energy and power densities. Supercapacitors have gained substantial attention for these applications since they offer outstanding advantages over conventional capacitors and batteries such as storing energy longer, discharging faster, longer shelf life, and excellent reversibility. However, current commercially available supercapacitors usually have a specific energy density of less than 10 Wh/kg, which becomes the limiting factor in system design and many applications. nGimat proposes to develop new solid-state supercapacitors based on solid state electrolytes and graphene based electrodes. The graphene will be processed to significantly increase the effective surface area and decorated with oxides to introduce additional psudocapacitance and increase permittivity. These supercapacitors have the advantages of high specific energy density, power density, operating voltage, cycling stability, chemical density, and charge-discharge rate based on the significant enhancement of electric double layer capacitance, psudocapacitance, permittivity, and operation voltage. Therefore, the proposed supercapacitor energy storage devices will enable a significant overall improvement in future power electronics systems enabling new military and commercial capabilities.
Benefits: There is a tremendous commercial and military interest on supercapacitors for various applications. It is predicted that global sales will reach $2 billion soon. Electronics and the automobile industries have been studying supercapacitors for the use in telecommunications devices, stand-by power systems, uninterruptible power supplies, and electric/hybrid vehicles. In recent years, the applications in electric/hybrid automobiles are becoming more and more important. All of these areas represent huge market size. The military will benefit from this dual use technology, which will enable high energy density, low cost, high thermal tolerance, and minimized power electronics devices and systems. The success in this work will enable the U.S. to maintain leadership in the global competition in this area. Capturing even a tiny percentage of this predicted $2 billion market represents a significant opportunity for nGimat.