Li0.3MnO2 synthesized by solid state reaction of CMD Faradizer M and LiOH or LiNO3 as lithiating agents, in atmosphere or with the addition of oxygen and in the temperature range 375-450 degrees C, has been investigated. Optimizing the synthesis route, a product with more then 30 m(2)/g specific surface area (SSA) was successfully synthesized and evaluated as positive electrode material iii lithium cells. High charge-discharge rates up to C/2 have been applied to carry out the electrochemical performances in laboratory test cells with Li reference electrode. Real coin cells CR2032 have been assembled and tested and demonstrated an energy density of about 400 mWh/g.