A lithium battery according to the inventive concept may comprise a cathode, an anode separated from the cathode, a first separator disposed between the cathode and the anode, the first separator having first pores, a second separator disposed on the first separator, the second separator having second pores, and an electrolyte filling a gap between the cathode and the anode. Diameters of the second pores may be smaller than those of the first pores. A standard deviation of the diameters of the second pores is smaller than that of the first pores.