Abstract: A method of making a rechargeable modified manganese-containing material is disclosed. The method includes mixing manganese nitrate with a doping material which may be a nitrate of a second metal and placing this mixture in an aqueous solution. Electrodes are then submerged in the solution and a current is passed through the electrodes to electrolyze the solution. This results in an electrolytic deposition of a first material on the cathode and a second material on the anode. The material deposited on the cathode is a rechargeable modified manganese-containing material in the discharge state. The material deposited on the anode is a modified manganese-dioxide material in the charged state. A battery employing the modified manganese-containing material is also disclosed.