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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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EMERGING TECHNOLOGIES The potential for stationary energy storage to transform the electric power industry is driving the development of many emerging storage technologies, including metal-air batteries, regenerative fuel cells, liquid-metal systems, and adiabatic compressed-air energy storage. While these technologies are in their infancy, they have the potential to improve the stability and resiliency of the electric grid in the long term, following extensive testing and demonstration. CURRENT PERCEIVED LIMITATIONS OF EMERGING TECHNOLOGIES Emerging technologies can also contribute to the commercialization of grid-scale storage. Metal-air batteries, regenerative fuel cells, liquid-metal systems, and compressed-air energy storage (CAES) are among the technologies with the highest potential. Yet, these technologies have their own set of limitations and gaps preventing them from having a significant impact: n METAL-AIR BATTERIES ARE NOT YET RECHARGEABLE. To be truly sustainable and cost-effective when implemented, metal-air batteries must be able to recharge. n CONTAMINANT CONTROL FOR METAL-AIR BATTERIES IS NOT COST-EFFECTIVE. Metal-air batteries are susceptible to a variety of contaminants, such as water and carbon dioxide, that can compromise their safety and performance. n REGENERATIVE FUEL CELLS HAVE LOW ROUND-TRIP EFFICIENCY. At present, the low efficiency of regenerative fuel cells from slow oxygen kinetics, as well as the unknown long-term stability of these devices, is inhibiting their development. n THE SCALABILITY OF LIQUID-METAL SYSTEMS HAS NOT BEEN DEMONSTRATED. Modeling of liquid-metal systems is currently too immature to demonstrate the potential for these systems to achieve the cost and scale requirements of grid applications. n THERE ARE NO FOSSIL-FUEL-FREE (ADIABATIC) CAES SYSTEMS. Because of this limitation, cost-effective heat storage is unavailable. COST TARGETS OF EMERGING TECHNOLOGIES Over time, better materials utilization and device design can reduce the cost of emerging technologies. Based on current knowledge of metal-air batteries, multivalent chemistries, and regenerative fuel cells, the following installed cost targets reflect ambitious but potentially achievable technology improvements. These cost targets are not intended to be predictions of cost reductions under “business as usual” conditions. Rather, they represent the aggressive cost reductions needed to accelerate widespread deployment of energy storage at grid scales: METAL-AIR BATTERIES n 2020: $2,500/kWh n 2030: $200/kWh (assuming scale is achieved) MULTIVALENT CHEMISTRIES n 2020: $1,500/kWh n 2030: $250/kWh EMERGING TECHNOLOGIES 37

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