A series of perovskite-type composite oxides Ca_1-xBi_xMnO_3-δ with different substituted Bi amount were synthesized by co-deposition method.The composition and structure of this obtained product was analyzed and characterized through XRD, AAS and TEM.The results showed that the Ca_1-xBi_xMnO_3-δ was just Perovskite-type while its crystal form changed with the substitute amount x of Bi.All the prepared samples were nanoparticles.The Ca_1-xBi_xMnO_3-δ showed a remarkable electrochemical activities.The discharge capacity of the Ca_1-xBi_xMnO_3-δ as the cathode material used in alkaline electrolyte solution arrives 380 mAh/g, which is 53% more than that of the international common sample No.1 (ICNo.1 MnO₂).The CV and EIS techniques were adopted to explain the improving electrochemistry of the perovskite-type Ca_0.9Bi_0.1MnO_3-δ.The double-exchange mechanism of charge carriers might be exployed to tackle it.

Key words: perovskite-type Ca_1-xBi_xMnO_3-δ, nanoparticle, cathode material, discharge capacity, double-exchange mechanism