Patent ID: 7807296

Claim:
A copper-manganese mixed oxide cathode active material having the formula Mn x Cu y O z .nH 2 O, wherein the oxidation state of Cu is between about +1 and about +3, the oxidation state of Mn is between about +2 and about +7, x is equal to about 3-y, y is less than about 3, z is calculated or experimentally determined based on the values of x and y, as well as the oxidation states of Mn and Cu, nH 2 O is the structural water molecules present in the mixed oxide cathode material, and n has a value between about 0.1 and about 10, wherein the discharge capacity of the mixed oxide cathode material at 1.1 V vs. a zinc wire reference electrode in a half-cell discharge test at 5 mA is at least about 50 mAh/gm.