German scientists make progress in developing sodium-air batteries

Researchers from the University of Giessen, Karlsruhr Research Center and BASF cooperated to replace the most commonly used metal lithium as the electrode material with sodium metal, and designed a new electrical energy storage and release solution-"sodium-air battery" , And developed battery samples.

"Sodium-air battery" During the discharge process with a voltage of about 2.2 volts, the alkali metal sodium combines with the oxygen element in the air on the cathode of the carbon material to form a stable peroxide. During the charging process, the sodium ions are reduced to Sodium metal releases oxygen, the efficiency of the charging and discharging process reaches 80-90%, and the theoretical electrical energy density can reach 1600 watts / kg. Compared with lithium materials, although the lithium electrode can theoretically achieve a higher power density, the electrochemical process of combining sodium and oxygen to form a peroxide is more stable than lithium. Therefore, this new type of "sodium-air battery" has the advantages of high stability and low voltage loss. The researchers believe that this research shows that sodium material also has the prospect of being the electrode material of new battery systems in the future.

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