Inorganic solid electrolytes are mechanically and thermally stable and thus may be regarded as the most promising electrolytes for the development of solid-state electrochemical devices. In this work all-solid-state symmetric and asymmetric supercapacitors with the oxide electrodes LiMn1.5Ni0.45Mg0.05O4, Mn2O3, MnO2 and the composite solid electrolytes 0.4LiClO(4)-0.6Al(2)O(3) were assembled and investigated. Electrode materials were prepared by mixing of oxides with solid composite electrolyte and carbon black. The cells were prepared by hot-pressing and electrochemically tested. From an analysis of galvanostatic charge-discharge curves it was shown that specific capacitance of the cells at 150 degrees C and the current density of 0.05 A/g reached 29 F/g corresponding to the charge capacity of 16 mA.h/g. (C) 2013 Published by Elsevier B.V.