The present invention relates to an electrode assembly and a secondary battery with the same, more particularly to the electrode assembly which includes an anode plate, a cathode plate, and a separator disposed between the anode plate and the cathode plate, wherein the separator includes a ceramic separator including a ceramic filler which is formed by mixing two groups of particles of the same material, but with a different diameter. The particles with the comparatively smaller diameter are disposed between the particles with the comparatively greater diameter.