Abstract: Modified manganese diocide has been prepared chemically and its properties of chemistry and cyclic voltammetry has also been studied. Experimental results indicate that the chemically modified manganese dioxide has excellent rechargeability both in deep and shallow discharge regions. The sample doped bismuth makes the two-electron discharge reaction carry out in advance, while the sample doped bismuth and nickel markes the two-electron discharge reaction carry out at low potential. The results also show that there are no unrechargeable products generated during the redox reaction.