OPERATION METHOD OF SODIUM-SULFUR BATTERY

摘要

PROBLEM TO BE SOLVED: To restrain a thermal energy amount which is necessary for temperature control set in the operation of sodium-sulfur battery. SOLUTION: Pinching a sodium ion conductive solid electrolyte, sodium as a negative electrode active substance and sulfur as a positive electrode active substance are arranged, a method to operate the sodium-sulfur battery generating sodium polysulfide in the positive electrode active substance by battery reaction includes a process in which the battery temperature of initiating the discharge is set up at the range of not less than the melting point of sodium polysulfide expressed as Na2S5, and not more than the melting point of sodium polysulfide expressed as Na2S4 and a process in which the battery temperature of end of the discharge and initiating the charge is set up at the range of not less than the melting point of sodium polysulfide expressed as Na2S4.