| abstract |
(57) [Problem] To provide a lithium secondary battery having a large battery capacity, a small self-discharge rate, excellent cycle characteristics, and high charge / discharge efficiency. SOLUTION: A positive electrode mainly composed of a compound capable of inserting and extracting lithium, and graphite having a crystallite size Lc of 150 ° or more in the c-axis direction in X-ray diffraction (however, a crystal in the c-axis direction in X-ray diffraction) And a negative electrode mainly composed of a mixture of a carbon material having a crystallite size Lc of 8 ° or less in the c-axis direction in X-ray diffraction and a negative electrode between the positive and negative electrodes. An interposed separator and an electrolytic solution in which an electrolyte solute is dissolved in a solvent are provided. As the solvent, ethylene carbonate and a low boiling point solvent (however, (Excluding dimethoxyethane). |