The La0.6Sr0.4CoO3 (LSCO) perovskite oxide has been synthesized by a dry gel combustion method and characterized by TGA, XRD, SEM and BET. The initial discharge capacities of LSCO/super-p electrode were 3672.1 mA h.g((carbon))(-1), 1418.4 mA h.g((carbon))(-1) and 1237.5 mA h.g(-1) ((carbon)) at the current densities of 30 mA h.g(-1), 50 mA h.g(-1) and 80 mA h.g(-1) respectively. The discharge capacity was maintained 16 times when the cut-off capacity was set as 500 mA h.g(-1) ((carbon)). The electrochemical impedance spectroscopy (EIS) data revealed that the impedance of battery would increase more quickly if the current density became larger after the same cycles. (C) 2014 Elsevier B.V. All rights reserved.