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Devices for Stationary Electrical Energy Storage Applications

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Devices for Stationary Electrical Energy Storage Applications ( devices-stationary-electrical-energy-storage-applications )

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PRIORITY ACTIVITIES TO ADVANCE POWER TECHNOLOGIES There are a variety of activities and initiatives that could help overcome the current gaps and limitations of high-speed flywheels and electrochemical capacitors in areas such as technology testing and validation, diagnostics and modeling, and system design. For power technologies, activities and initiatives can accelerate progress in the following areas: n ELECTROCHEMICAL CAPACITORS – Testing and demonstrating electrochemical capacitors can help to validate technology lifetime, ramp rates, and other performance characteristics that need to be proven to encourage stakeholder buy-in. Diagnostics and modeling could help provide an understanding of the limitations of current electrochemical capacitor designs and could help to drive the development of high-energy electrodes. n HIGH-SPEED FLYWHEELS – Developing a 1-megawatt motor capable of vacuum operation and superconduction, and developing a hubless flywheel rotor with four times the energy capacity of existing flywheel technologies, can significantly increase the efficiency and reduce the cost of flywheels. A magnet with a higher mechanical strength and continuous operating motors is necessary to help mitigate the challenges derived from increased friction on the flywheel hub. n DEVELOPMENT OF NEW POWER TECHNOLOGIES – New, transformational or complementary power devices beyond electrochemical capacitors and flywheels could play a role in advancing grid-scale storage. Such devices include hybrid capacitors, which combine an electrochemical capacitor electrode with a battery electrode, and large-scale dielectric capacitors, which could be enabled by the development of new materials and production processes. The success of these activities and initiatives will require significant support from DOE. To help DOE better focus its resources over time, Figure 7 divides the solutions by the time frame in which they will impact the market: near term (less than 5 years), mid term (5–10 years), and long term (10–20 years). The bolded activities are high-priority initiatives. 2 X 1-MEGAWATT, 15-MINUTE FLYWHEELS NEW ENGLAND ISO 34 ADVANCED MATERIALS AND DEVICES FOR STATIONARY ELECTRICAL ENERGY STORAGE APPLICATIONS

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