Electrochemical performance of cathodes prepared on current collector with different surface morphologies

LiCo1/3Ni1/3Mn1/3O2 cathode electrodes were prepared onto Al current collectors with different surface morphologies through usual doctor blade technique. Their electrochemical performances, especially at high current rate, were influenced by the surface morphology of the current collector:. These implied the less polarization for the electrode prepared on the surface roughened current collector. In addition, the AC complex impedance analysis exhibited that the interface resistance between the film electrode and the current collector as well as the interface resistance between the electrode and the electrolyte was reduced in the case of the surface-roughened current collector, but that the Ohmic resistance was enlarged.

► The electrochemical performance of cathodes was influenced by the surface morphology of the current collector. ► The surface roughening of the current collector improved the rate capacity of the cathode electrode. ► The surface roughening of the current collector results in the lowering of the interfacial impedances.