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