RECHARGEABLE BATTERY SN-BASED NEGATIVE ELECTRODE ACTIVE MATERIAL, NA SECONDARY BATTERY COMPRISING A NEGATIVE ELECTRODE ACTIVE MATERIAL AND MANUFACTURING METHOD OF THE ANODE ACTIVE MATERIAL

摘要

The present invention relates to a tin-based negative electrode active material for a sodium secondary battery, a producing method of a negative electrode active material, a sodium secondary battery comprising a negative electrode active material. The producing method of a tin-based negative electrode active material for a sodium secondary battery comprises the steps of: electric-exploding tins by applying high voltage pulse power supply to the tins in liquid; and producing a negative electrode active material using tin nanoparticles produced by electric-explosion. The negative electrode active material comprises: composite active material sulfur for preventing aggregation between the tin nanoparticles; and a carbon material for increasing conductivity. The sodium secondary battery having cheap production cost in comparison with a lithium ion battery is produced, and also the sodium secondary battery having high theoretical capacity can be obtained while reducing production cost by applying a tin-based negative electrode active material having high theoretical capacity.