Dielectric Materials for Capacitive Energy Storage

Caporus Technologies is applying patent-pending dielectric technology in the development of capacitors for power conversion systems. These dielectrics incorporate porous structures at the nanoscale to enable nature’s ultimate insulator, vacuum, to operate at levels beyond the limits of conventional dielectrics. Caporus’ technology provides performance improvements in energy storage capacity, operating temperature, and stability that translate to more compact devices with higher reliability and efficiency.


Critical need for this Technology

The world is at the beginning stages of a transition in how power is produced and consumed. Centralized power plants based on fossil fuels are now competing with distributed renewable energy sources. In transportation, electric vehicles are gaining significant market share, and drones and other electric aircraft will transform shipping, mobility, and other industries. In all of these areas, capacitors are critical to the power conversion and filtering systems that enable these growing markets.

While these new and growing applications demand capacitors with smaller size and weight, high temperature compatibility, and reliability, existing capacitor technology has reached its limits. Capacitive energy storage depends on electrical insulators (dielectrics), and the solid dielectrics of polymer or ceramic used today operate near their fundamental performance limits. With only marginal improvements possible in solid dielectric performance, capacitors have primarily been limited to manufacturing and packaging advancements. Additionally, since the dielectrics for capacitors are produced by only a small number of manufacturers, there is relatively little differentiation or innovation in materials between capacitor manufacturers.

To meet the performance metrics demanded by many emerging and growing applications, novel materials are required that can go beyond the limits of conventional solid dielectrics.

Potential CO2 Reduction

Currently around 8% of electricity is lost before it reaches end users, and electricity generation accounts for approximately 12,000 MtCO2e of emissions each year. Reducing transmission and distribution losses lowers the amount of energy that must be generated to meet demand, and thereby avoids the emissions that would occur when generating this extra energy. Caporus’ high-power capacitors can be used in power conversion devices to reduce electricity transmission and distribution losses and have the potential to avoid tens of MtCO2e of emissions each year.


  • Polymer dielectric films, including polypropylene, are a common capacitor dielectric manufactured by several corporations that also produce for the plastic film market in packaging and other industries.
  • Capacitor manufacturers are more vertically integrated, producing their own dielectrics, for ceramic capacitors and nanolaminate polymer capacitors.

Potential Markets

While capacitors cover a wide range of applications with a total market of over $20 billion, the corresponding wide range of application requirements enables Caporus Technologies to narrow the initial target markets. The technology is uniquely suited to serve the medium to high voltage markets (> 500 V) that are currently served by polymer film technology with additional overlap with high voltage electrolytic and ceramic technologies.

Caporus is focused on the high performance segments of these industries that demand reliability while decreasing size/weight, increasing temperature capabilities, and maintaining stable operation over a range of conditions. These applications include motor drives in electric vehicles and industrial controls, power converters between distributed energy resources, energy storage systems, and the grid, and specialty applications for high voltage and high power systems. While the serviceable obtainable market is being determined, the market for polymer dielectric films in capacitors alone is more than $1 billion.

Key Innovation

Caporus’ dielectrics provide nanoscale porosity in a unique structure that enable nature’s ultimate insulator, vacuum, to operate at extreme electric field levels beyond the limits of conventional solid, liquid, or gas dielectrics.

R&D Status of Product

Since the beginning of participation in the Chain Reaction Innovations program, Caporus’ dielectric technology has progressed from its theoretical and computation foundation to demonstrated coatings and small-scale capacitors. Recent demonstration of producing the dielectrics with industry-standard equipment for mass production has prepared Caporus to produce and test full-scale capacitor prototypes. The foundational intellectual property has been examined by the USPTO and is allowed for issuance of a patent.

Team Overview

Caporus Technologies is led by its founder, Dr. Kevin O’Connor. The supporting team of Robert Visovsky, Carl Traynor, and Andy Urda provide expertise in business development, strategy, product development, marketing, and sales. Scientific and commercial advisors from Argonne National Laboratory and industry partners inform Caporus’ product and business development decisions. As the internal technical operations team is being expanded in summer 2020, Caporus’ external legal team is coordinating expansion of the intellectual property portfolio.

Technology Profile

Status: Pre-revenue – Technology and business development
Primary industry: Electrical manufacturing
Category: Energy storage; electric transportation; advanced materials

Estimated annual revenue: N/A
Employs: N/A
R&D commercial collaborator: N/A – not public