| 摘要 |
The purpose of the present invention is to provide an energy storage device excellent in high rate cycle endurance at high temperature. To this end, an energy storage device (10) comprises a positive electrode (410), a negative electrode (420), a separator (430) disposed between the positive electrode (410) and the negative electrode (420), a non-aqueous electrolyte, and an inorganic coating layer (440) disposed between the positive electrode (410) and the separator (430), wherein the positive electrode (410) contains a compound represented by Li_aNi_bCo_c Mn_dO_2 (provided that a, b, c, and d satisfy the equations of 0<=a<=1.2, 0<=b<=1, 0.1<=c<=0.4, 0<=d<=0.5, and b+c+d=1) as a positive active material, and the negative electrode (420) contains hardly graphitizable carbon with a D50 particle diameter greater than or equal to 1.0 μm and less than or equal to 6.0 μm as a negative active material. |
