| abstract |
A sodium molten salt battery having a higher volumetric energy density and higher utilization efficiency of a positive electrode active material than a conventional molten salt battery is provided. A sodium molten salt battery includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode active material including a sodium-containing transition metal oxide, and sodium ion conductivity. And a molten salt electrolyte having a volume energy density of 150 Wh / L or more. [Selection] Figure 1 |