The present invention provides an electrode comprising a current collector; an electrode active material layer formed on at least one surface of the current collector and comprising a mixture of electrode active material particles and a first binder polymer; and a porous coating layer formed on the surface of the electrode active material layer, comprising a mixture of inorganic particles and a second binder polymer and having a thickness deviation defined by the following Formula (1), and a manufacturing method thereof: (Tmax−Tmin)/Tavg≦0.35  (1) wherein Tmax is a maximum thickness of the porous coating layer formed on the surface of the electrode active material layer, Tmin is a minimum thickness of the porous coating layer and Tavg is an average thickness of the porous coating layer.