Method for activating lithium secondary battery and lithium secondary battery

The present invention relates to a method for activating a lithium secondary battery and a lithium secondary battery manufactured by the same, the method comprising: a step 1 of preparing a secondary battery, the secondary battery includes a positive electrode having a sacrificial positive electrode material represented by Formula 1 and having an orthorhombic structure, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte. And a step 2 of charging the secondary battery and then holding the secondary battery at a voltage of 3.2 V or more for a predetermined period of time. 本发明涉及一种锂二次电池的活化方法以及通过所述活化方法制造的锂二次电池，其中所述活化方法包括：步骤1：准备二次电池，所述二次电池包含具有由式1表示并且具有正交晶系结构的牺牲正极材料的正极、负极、设置在所述正极与所述负极之间的隔膜和电解液；以及步骤2：对所述二次电池进行充电，然后将所述二次电池在3.2V以上的电压下保持预定时间段。