Molten Salt Sodium Oxygen Battery

Described herein is a molten salt Na O2 battery which includes a first electrode including liquid Na in a direct contact with a solid-state electrolyte; and a composite second electrode in contact with the solid-state electrolyte, wherein the composite second electrode includes: particles having an oxygen-active surface; a molten salt comprising redox-active ions; and O2 in contact with the composite second electrode; where the solid-state electrolyte is disposed between the first electrode and the composite second electrode. Methods of making the battery and methods of producing electricity with the battery are also described.