SODIUM SECONDARY BATTERY, METHOD OF MANUFACTURING NEGATIVE ELECTRODE FOR SODIUM SECONDARY BATTERY, AND METHOD OF MANUFACTURING SODIUM SECONDARY BATTERY INCLUDING NEGATIVE ELECTRODE

摘要

PROBLEM TO BE SOLVED: To provide a sodium secondary battery without having irreversible capacity and with excellent cycle characteristics.SOLUTION: Disclosed is a sodium secondary battery. This sodium secondary battery includes: a positive electrode capable of absorbing and desorbing sodium ions; a negative electrode including alloy containing tin; and an electrolyte having sodium ion conductivity. Sodium is pre-doped to the negative electrode.