ELECTROLYTE SOLUTION COMPRISING SULFUR DIOXIDE-BASED, GALLIUM-BASED INORGANIC ELECTROLYTE, AND SODIUM-SULFUR DIOXIDE SECONDARY BATTERY HAVING SAME

摘要

The present invention relates to an electrolyte solution comprising a sulfur dioxide-based, gallium-based inorganic electrolyte, and a sodium-sulfur dioxide (Na-SO₂) secondary battery having same, the purpose of the present invention being to enhance the overall energy efficiency of the sodium-sulfur dioxide secondary battery by improving a serious polarization phenomenon that occurs during the battery assessment of the battery. The sodium-sulfur dioxide secondary battery, according to the present invention, comprises: a negative electrode which is formed from an inorganic material and which contains sodium; a positive electrode which is formed from a carbon material; and a sulfur dioxide-based inorganic electrolyte solution. The electrolyte solution comprises a sulfur dioxide-based, gallium-based inorganic electrolyte prepared by injecting SO₂ gas in a mixture of NaX and GaX₃. Here, X comprises a halogen-based compound, a saturated hydrocarbon(R) having C1~C20, an unsaturated hydrocarbon(R) having C1~C20, OR, or SR.