Abstract
Inorganic molten salts make excellent battery electrolytes, owing to their high ionic conductivity, low vapor pressure, and noninflammability. The only battery system in production to date, which makes use of such an electrolyte, is the sodium metal halide or ZEBRA battery. The molten salt used in this battery technology is molten sodium tetrachloroaluminate. Used as the liquid Na+ ions carrier in the positive electrode, this molten salt electrolyte plays a major role in system’s safety and charge-discharge limits. The aim of this contribution is to present the battery-relevant properties and functionality of this molten salt electrolyte in the ZEBRA system. The potential of this battery technology in electric grid applications will be also addressed.
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