Nanosized perovskite alkaline earth metal titanates were prepared by sol-gel method. Electrochemical properties of MnO2 electrodes modified with 5% nanosized MT1O3 were investigated by galvanostatic charge-discharge and cyclic voltammetry experiments in 40%KOH solutions. The results from galvanostatic charge-discharge showed that the formation of electrochemically inactive M^O^ was partly restrained at the second dischai'ge step, and the discharge capacities of modified MnO2 electrodes were in average 40% higher than that of I. C. No. 1 in heavy/middle load discharge. The rechargeable properties of MnC>2 electrodes doped with 5 % MTiC>3 were also improved to certain extent. Cyclic voltammetric results indicated that nanosized MTiOj were not involved in electrode reactions during charge-discharge process; but the charge transfer and mass transform of electrodes were enhanced by introduction of nanosized MTiO3. The utilization of electroactive materials increased with the increasing of redox reaction current. Nanosized MTiO3 can not effectively prevent MnO2 lattice stmcture from being destroyed after several cycles, but they can slow the decreasing rate of discharge capacity.

Key words: NANOPHASE MATERIALS, ALKALINE EARTH METAL, TITANATE, SOL-GEL PROCESS, MODIFICATION, CYCLOVOLTAMGRAPH