RECHARGEABLE LITHIUM BATTERY

Disclosed is a rechargeable lithium battery including a negative electrode including a negative current collector, a negative active material layer disposed on the negative current collector, and a negative electrode functional layer disposed on the negative active material layer; and positive electrode including a positive current collector and a positive active material layer disposed on the positive current collector, wherein the negative electrode functional layer includes flake-shaped polyethylene particles, the positive active material layer includes a first positive active material including lithium and at least one of a composite oxide of a metal selected from cobalt, manganese, and nickel, and a second positive active material including a compound represented by Chemical Formula 1, and carbon nanotubes, and the carbon nanotubes have an average length of 30 µm to 100 µm measured by field emission scanning electron microscope. [Chemical Formula 1] LiFeMPO In Chemical Formula 1, 0.90 ≤ a ≤ 1.8, 0 ≤ x1 ≤ 0.7, and M is at least one of Mn, Co, and Ni.