Abstract

We discuss how the ideal rechargeable energy accumulator can be made and what the limits for solid-state energy storage are. We show that in theory, spin batteries based on heavy fermions can surpass chemical ones in terms of energy capacitance. The absence of chemical reactions in spin batteries makes them more stable, and also they do not need to be heated in cold conditions. We study how carrier statistics and the density of states affect the energy capacity of the battery. Also, we discuss hypothetical spin batteries based on neutron stars.

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