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|1. (WO2013116263) INTERMEDIATE TEMPERATURE SODIUM METAL-HALIDE ENERGY STORAGE DEVICES|
|Applicants:||BATTELLE MEMORIAL INSTITUTE
|Inventors:||KIM, Jin, Yong
SPRENKLE, Vincent, L.
LEMMON, John, P.
COYLE, Christopher, A.
|Title:||INTERMEDIATE TEMPERATURE SODIUM METAL-HALIDE ENERGY STORAGE DEVICES|
Sodium metal-halide energy storage devices utilizing a substituting salt in its secondary electrolyte can operate at temperatures lower than conventional ZEBRA batteries while maintaining desirable performance and lifetime characteristics. According to one example, a sodium metal-halide energy storage device operates at a temperature less than or equal to 200 °C and has a liquid secondary electrolyte having MxNa1-yAlCl4-yHy, wherein M is a metal cation of a substituting salt, H is an anion of the substituting salt, y is a mole fraction of substituted Na and CI, and x is a ratio of y over r, where r is the oxidation state of M. The melting temperature of the substituting salt is less than that of NaCl.