RECHARGEABLE LITHIUM BATTERY

Disclosed is a rechargeable lithium battery including an electrode assembly including a positive electrode including a positive current collector and a positive active material layer disposed on the positive current collector; 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 a separator, wherein the positive active material layer includes a first positive active material including lithium and at least one of a composite oxide of metal selected from cobalt, manganese, and nickel, and a second positive active material including a compound represented by Chemical Formula 1, the negative electrode functional layer includes flake-shaped polyethylene particles, and a battery capacity is greater than or equal to 3.5 Ah. [Chemical Formula 1] LiaFe1-x1Mx1PO4In Chemical Formula 1, 0.90 ≤ a ≤ 1.8, 0 ≤ x1 ≤ 0.7, and M is at least one of Mn, Co, and Ni.