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Possible advantages of amorphous manganese dioxide as a cathode material for application in the electrochemical power sources are briefly outlined. A synthetic routine enabling one to produce amorphous manganese oxide from aqueous solutions is described. Preliminary galvanostatic tests reveal better performance of this material in coin-type cells with lithium anodes, if compared with conventional electrolytic manganese dioxide. Cycling studies demonstrate an ability of amorphous manganese oxide to reversibly form compounds with lithium.