METHOD FOR PREPARING ANODE AND SECONDARY BATTERY COMPRISING THE ANODE PREPARED THEREBY

The present disclosure relates to a secondary battery including a cathode formed on a cathode current collector and at least one surface of the cathode current collector and comprising a cathodic active material and a binder; an anode formed on an anode current collector and at least one surface of the anode current collector and comprising a anodic active material and a binder; and a separation film disposed between the cathode and the anode, wherein surface roughness (Ra) of the anode is 1.0 μm or less, and a standard deviation of the surface roughness of the anode is 0.05 or less. An anode prepared according to an example embodiment of the present disclosure has improved surface roughness, and accordingly, electrical resistance of a lithium ion secondary battery can be reduced, and further, long lifespan characteristics are improved.