IONova Technologies Awarded Phase II STTR Grant From U.S. Department Of Energy To Continue Development of 3-D Nanofilm™ Asymmetric Ultracapacitor

Asymmetric ultracapacitors achieve greater energy density versus today’s Electric Double Layer Capacitors (EDLCs) by combining one activated carbon EDLC ion adsorption electrode with one ion insertion (battery-like) electrode. Asymmetric ultracapacitors based on non-aqueous electrolytes provide improvements in energy density but they typically do so at the expense of power density while providing no improvement in cost, safety or in environmental impact. Alternatively, aqueous (water-based) asymmetric ultracapacitors can provide improvements not only in cost, safety and in some cases, environmental impact, but can also provide greater energy and power densities than the non-aqueous approach.

Under this grant, Ionova has partnered with Dr. Jim P. Zheng of Florida State University to further develop an asymmetric ultracapacitor with water-based electrolytes, based on a 3-dimensional (3-D) mixed-oxide nanofilm cathode investigated during the preceeding Phase I program. The high surface area 3-D Nanofilm™ approach decreases resistances in solvated ion transport, in solid-state ion diffusion and in electron transport thereby maximizing power density and efficiency while decreasing heat and rate-induced capacitance fade. This approach also improves the utilization of the active material resulting in increases in energy density while improving cost, safety and environmental impact. In the course of this program, the 3-D Nanofilm™ ultracapacitor is scaled up for HEV and PHEV applications.

The 3-D Nanofilm™ ultracapacitor is safe, cost-effective and environmentally benign with increased usable energy suitable for electric vehicle, hybrid electric vehicle and plug-in hybrid electric vehicle use. Due to the unique characteristics of this chemistry, the 3-D Nanofilm™ ultracapacitor can be constructed of multiple stacked cells in a single package allowing greater voltage scalability for applications including electric grid, UPS/power conditioning, mobile computing and communications, power tools, military and industrial applications.