SECONDARY BATTERY ACTIVATION METHOD

A method of activating a secondary battery according to the present invention includes: a pre-aging step of aging a secondary battery, where an electrode assembly and an electrolyte solution are accommodated in a battery case, at a room temperature; an formation step of initial-charging the pre-aged secondary battery; a room temperature aging step of aging the initial-charged secondary battery at a room temperature; a step of full-charging the room-temperature-aged secondary battery to a voltage of 4.4V or more; and a degassing step of removing gas inside the secondary battery. According to the present invention, it is possible to increase the remaining amount of an electrolyte solution inside an electrode by full-charging a secondary battery.