Room temperature Na/S batteries with sulfur composite cathode materials

Sodium/sulfur (Na/S) batteries were assembled with a sodium metal anode, liquid electrolyte and a sulfur composite cathode. Their electrochemical characteristics have been investigated at room temperature. Their charge/discharge curves indicate that sodium can reversibly react with sulfur at room temperature. The specific capacity of the sulfur composite cathode material in the first cycle was initially about 655 mA h g−1 and stayed at about 500 mA h g−1 up to the 18th cycle with about 100% charge/discharge efficiency.