Lithium secondary battery and method for manufacturing same

The lithium secondary battery includes a cathode formed of a cathode active material including first cathode active material particles and second cathode active material particles; an anode; and a separator interposed between the cathode and the anode. The first cathode active material particle includes a lithium metal oxide having a continuous concentration gradient in at least one region between a central portion and a surface portion. The second cathode active material particles include a lithium metal oxide including at least two metals other than lithium having a constant concentration from a central portion to a surface, and the second cathode active material particles include an excess amount of nickel in the metals other than lithium. 锂二次电池包括阴极，其由包含第一阴极活性材料颗粒和第二阴极活性材料颗粒的阴极活性材料形成；阳极；和介于阴极和阳极之间的隔膜。第一阴极活性材料颗粒包含锂金属氧化物，所述锂金属氧化物在中心部分和表面部分之间的至少一个区域中具有连续浓度梯度。第二阴极活性材料颗粒包括锂金属氧化物，所述锂金属氧化物包括从中心部分到表面具有恒定浓度的除锂之外的至少两种金属，并且第二阴极活性材料颗粒在除锂以外的金属中包括过量的镍。