METHOD FOR TREATING NEGATIVE ELECTRODE PLATE, AND SODIUM METAL NEGATIVE ELECTRODE PLATE AND RELATED APPARATUS

The present application provides a method for processing a negative electrode plate, a sodium-metal negative electrode plate and related devices. In a vacuum environment, the metal vapor reacts with oxygen, and the metal oxide formed by the reaction is plated on the surface of the sodium-metal negative electrode plate to form a metal oxide protective layer with high mechanical strength and stable chemical properties. The metal oxide protective layer can greatly reduce the phenomenon of low yield and performance deterioration caused by the reaction of sodium metal with air and water during the processing of the sodium-metal negative electrode plate. Since the metal oxide has a nanoscale thickness, it can form a corresponding sodium salt with sodium metal under electrochemical conditions, thereby improving the sodium ion transport rate on the surface of the sodium-metal negative electrode plate and improving the battery's kinetic performance. Moreover, the metal oxide has high mechanical strength, which can maintain the structural integrity when the volume of the sodium-metal negative electrode plate changes during charge and discharge, prevent the direct contact between the sodium metal and the electrolyte to form a large number of sodium dendrites, and improve the battery's cycle performance.