Electrolyte for sodium secondary battery and sodium secondary battery employing the same

摘要

Provided are an electrolyte for a sodium secondary battery, and a sodium secondary battery employing the same, and more particularly, a sodium secondary battery including an anode containing sodium, a cathode containing a transition metal, and a sodium ion conductive solid electrolyte provided between the anode and the cathode. The cathode is impregnated with a mixed salt electrolyte containing a molten sodium salt and an electrolyte additive, and the electrolyte additive contains a non-halogen sodium salt and a metal halide compound simultaneously.

主权项

1. An electrolyte for a sodium secondary battery comprising a molten sodium salt, and 0.1 to 30 wt % of an electrolyte additive containing a salt represented by following Chemical Formula 1 and another salt represented by following Chemical Formula 2:
NaA  [Chemical Formula 1] MX3  [Chemical Formula 2] wherein Na is a sodium cation; A is an anion of a non-halogen element or a compound containing the non-halogen element; M is a cation of one metal selected from the group consisting of Group 3 or Group 13 metals; and X is an anion of one element selected from the group consisting of Group 17 halogen elements.