Disclosed is a lithium secondary battery including (i) a cathode active material including a lithium metal phosphate according to Formula 1 below, (ii) an anode active material including amorphous carbon, and (iii) an electrolyte for lithium secondary batteries including a lithium salt and an ether-based solvent, Li1+aM(PO4-b)Xb  (1) wherein M is at least one selected from the group consisting of Group II to XII metals, X is at least one selected from F, S, and N, −0.5≦a≦+0.5, and 0≦b≦0.1.