A positive electrode including a positive electrode composite layer disposed on a current collector, the positive electrode composite layer including a positive electrode active material, carbon nanotubes, and carbon black. A ratio, (BETCB)/(BETCNT), of a BET surface area BETCB of the carbon black to a BET surface area BETCNT of the carbon nanotubes is between 1.0 and 3.4, and the carbon nanotubes have a number cumulative average particle size D50CNT ranging from 0.9 μm to 4.0 μm. A positional relationship between the carbon nanotubes and the carbon black within the positive electrode and connectivity with active material particles are excellent, and thus both ionic conductivity and electrical conductivity are improved. Accordingly, a lithium secondary battery offering superior resistance, improved lifespan, and price competitiveness is provided.