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, wherein propylene carbonate (PC) is included in an amount of 1 wt % to 60 wt % in the electrolyte for lithium secondary batteries, based on the total weight of the electrolyte, Li1+aM(PO4−b)Xb  (1) wherein M is at least one selected from metals of Groups II to XII; X is at least one selected from F, S and N, −0.5≦a≦+0.5, and 0≦b≦0.1.