Lithium secondary battery, battery module and battery pack

A lithium secondary battery comprising:

• a cathode having a cathode active material;
• an anode having an anode active material;
• a separator disposed between the cathode and the anode;
• and
• an electrolyte,
• wherein the cathode active material comprises a lithium composite transition metal compound comprising nickel (Ni), cobalt (Co) and manganese (Mn),
• wherein the lithium composite transition metal compound comprises at least one of single particles or pseudo-single particles having an average particle diameter (D50) of 1 μm or more, wherein each single particle consists of one nodule, wherein each pseudo-single particle is a composite of 30 or fewer nodules,
• wherein the anode active material comprises a silicon carbon composite, wherein the silicon carbon composite has an average particle diameter (D50) of more than 1 μm,
• wherein the average particle diameter (D50) of the at least one of single particles or pseudo-single particles is smaller than the average particle diameter (D50) of the silicon carbon composite, and
• wherein the silicon carbon composite has a core of silicon and carbon composite,
• wherein the lithium composite transition metal compound further comprises secondary particles,
• wherein the anode active material further comprises graphite,
• wherein the average particle diameters (D50) of the secondary particles, the at least one of single particles or pseudo-single particles, the graphite and the silicon carbon composite are represented by A, B, C and D, respectively, and wherein B<D≤A<C.