Abstract: Nanometer order bismuth doped chemical manganese dioxide (nm-Bi-CMD) wasprepared by sol-gel method.The results of XRD, TEM, ICP measurements and chemicalanalysis showed that the sample was of γ-type crystal structure, and in nano size.Mixingthe nm-Bi-CMD with Bi-EMD(electrolytic maganese dioxide) in optimum weight ratio in-creased the charge/discharge performance of the products.Cycle volrammogram, AC con-ductivity and AC impedance measurements showed that the doping of nm-Bi-CMD, decreas-ing the resistance between crystal grains of the doped samples, raised the surface roughnessand improved the stability of the electrode surface.

Key words: bismuth doped manganese dioxide, nano meter material, sol gel method, preparation