A rechargeable battery cell includes an anode with a major portion of active material, a cathode including MnO2 doped with bismuth, and a separator between the cathode and anode which substantially prevents {HEAD ~ bismuth} from migrating from {TAIL ~ the cathode} to the anode 
A rechargeable battery cell includes an anode with a major portion of active material , a cathode including MnO2 doped with bismuth , and a separator between the cathode and anode which substantially prevents { HEAD ~ bismuth } from migrating from { TAIL ~ the cathode } to the anode
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