| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery having an excellent high temperature shelf life, excellent load characteristics after use at high temperature, and excellent charging/discharging cycle characteristics. SOLUTION: A wound electrode body 20 formed by winding a belt-shaped positive electrode 21 and a belt-shaped negative electrode 22 through a separator 23 is contained in a battery can 11. The positive electrode 21 contains LixMn2-yMayO4 (Ma is at least one kind in a group comprising a metal element other than Mn, and B) and LiCoO2 or LiCo1-zMbzO2 (Mb is at least one kind in a group comprising a metal element other than Co, and B). Thereby, in the secondary battery, the high temperature storage characteristics can be increased. By specifying the average particle size of the oxides 30 μm or less, the charge/discharge cycle characteristics can be increased. By using non- graphitizable carbon in the negative electrode 22, heavy load discharge characteristics after high temperature cycles can be improved. |
