SODIUM-SULFUR BATTERY, METHOD FOR OPERATING SAME, AND USE OF PHOSPHORUS POLYSULFIDE AS ELECTROLYTE ADDITIVE IN SODIUM-SULFUR BATTERIES

摘要

The invention relates to a sodium-sulfur battery which is less susceptible to the negative effects of the polysulfide shuttle mechanism than known sodium-sulfur batteries. By adding an additive for complexing sodium polysulfide, the typically occurring polysulfide shuttle mechanism and the associated self-discharge of the battery were prevented. Additionally, a lower charge voltage and a higher discharge voltage are exhibited during the cycling of the battery. As a result, the sodium-sulfur battery according to the invention has a substantially better degree of energy efficiency and discharge capacity than known sodium-sulfur batteries. The invention also relates to a method for operating the battery and to the use of the phosphorus polysulfide, optionally in combination with sodium sulfide, as an electrolyte additive in sodium-sulfur batteries.