METHOD FOR CHARGING SECONDARY BATTERY

[Abstract] To provide a means for more effectively suppressing a short circuits in a secondary battery. A method for charging a secondary battery including a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer, and a negative electrode current collector in this order and utilizing a deposition-dissolution reaction of metallic lithium as a reaction of a negative electrode, the method having a multi-stage charging step, and comprising at least: a first charging step in which the secondary battery is charged at a first current density I1 to deposit metallic lithium on a surface on the solid electrolyte layer side of the negative electrode current collector to form a deposited Li layer that is a part of a negative electrode active material layer and that comprises the metallic lithium; and a second charging step in which the secondary battery is charged at a second current density I2 greater than the first current density I1 after the first charging step to increase a thickness of the deposited Li layer, wherein the first charging step includes performing pausing at least once or discharging at least once, in which the secondary battery is charged at the first current density I1 so that an SOC does not exceed 4.5%.