Sacrificial positive electrode material having reduced gas generation amount and lithium secondary battery comprising same

The invention relates to a sacrificial positive electrode material with reduced gas generation amount and a preparation method thereof. The sacrificial positive electrode material comprises a lithium cobalt metal oxide doped with a specific proportion of zinc represented by Chemical Formula 1 and has a powder conductivity adjusted within a specific range, thereby being capable of reducing gas, especially oxygen (O2), generated during charging and discharging of a battery after activation and achieving high charging/discharging capacity. Therefore, the stability and the service life of the battery comprising the same are effectively enhanced. 本发明涉及一种具有减少的气体产生量的牺牲正极材料及其制备方法，所述牺牲正极材料通过包含由化学式1表示的掺杂有特定比例的锌的锂钴金属氧化物并具有调节在特定范围内的粉末电导率而能够减少在活化后在电池的充电和放电过程中产生的气体、尤其是氧气(O2)并实现高的充电/放电容量，由此有效地增强了包含其的电池的稳定性和寿命。