SODIUM ION SECONDARY BATTERY USING CARBONACEOUS MATERIAL FOR SODIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE

A sodium ion secondary battery that has high discharge capacity, excellent cycling characteristics, and excellent storage characteristics is provided. The present disclosure includes a carbonaceous material for a sodium ion secondary battery negative electrode. The carbon source of the carbonaceous material is a plant, and the carbonaceous material has a BET specific surface area of 100 m/g or less.