abstract |
Provided is a high-capacity battery that has high input and output while ensuring safety. This lithium-ion battery has a discharge capacity of at least 30 Ah and comprises, in a battery container, an electrolyte and an electrode winding group obtained by winding a positive electrode, a negative electrode, and a separator. The positive electrode includes a current collector and a positive electrode mixture that is applied to both surfaces of the current collector, and the positive electrode mixture has the following composition. The positive electrode mixture includes a mixed active material of a layered lithium-nickel-manganese-cobalt composite oxide (NMC) and a spinel-type lithium-manganese oxide (sp-Mn), the density of the positive electrode mixture is 2.4-2.7g/cm 3 , and the application amount of the positive electrode mixture is 175-250g/m 2 . Furthermore, the weight ratio (NMC/sp-Mn) of the mixed active material is 10/90-60/40. Additionally, the relationship Y < -0.0062X + 1.05(30 ≤ X < 100) is satisfied, where X is the discharge capacity and Y is the weight ratio. |