| abstract |
A sodium molten salt battery includes a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator provided between the positive electrode and the negative electrode, and a molten salt electrolyte having sodium ion conductivity, in which the negative electrode active material contains hard carbon and is pre-doped with sodium ions, and in which when the state of charge is 0%, the potential of the negative electrode is 0.7 V or less with respect to metallic sodium. |