PURPOSE: To provide a negative electrode and organic solvent-based electrolyte for a nonaqueous secondary battery of a favorable current efficiency and having a large capacity.
CONSTITUTION: In a nonaqueous secondary battery comprising a positive electrode, organic solvent-based electrolyte, and a negative electrode, the negative electrode uses carbon material including graphite of a surface interval d002 of a carbon net surface of less than 0.337nm for active material, and the organic solvent-based electrolyte comprising γ-BL and ring carbonate, and including i-butyrolactone at a ratio of 20 volume% or more and less than 50 volume% is used for the electrolyte. By combination of the negative electrode, the electrolyte, and various types of the positive electrodes, a nonaqueous secondary battery of a large current efficiency, and a large capacity can be provided.
ARAI KENJI
SUZUKI YOSHIO
