Preparation And Electrochemical Performance Of Nano Manganese Dioxide

Manganese dioxide, an active cathode material, has been widely applied in battery industry.The quality of MnO2 plays a key role in the performance of the Zinc-Manganese Batteries. To improve the performance of MnO2 is very necessarily. Due to its special physical and chemical characteristics, nano materials was begun to be used in the batteries.In this Paper nano-MnO2 were selected to investigate their characteristic, and finally discuss the nano doping effects in EMDAt first, the sol-gel preparation technology of nano MnO2 was studied, the radio of reagents,PH ,both temperature and time of sinter,also acidifi-cation which affected theproperties of nm-MnO2 was investigated.Find, the optimized techonology for preparing nano MnO2 was as follows-, the molar ratio of citric acid and Mn(Ac)2 was 0.4:1, the PH of solution was adjusted to 6, grinding dry-gel for 10h at 350℃, the production of grinding was acidified by 2mol/L H2SO4 for 2h.To improve the performance of the samples, it was thermal-acidified at 500℃,and found that made the MnO2 content of sample improve, particle diameter small and the discharge capability of sample was advanced remarkably, 52 percent increase than that of EMD at -0.4V.Also, the effects of electrolyte additives and electrode-preparing technology on the electrochemical properties of MnO2 electrode were studied.lt was found that acceding 10%TEA to 9mol/LKOH solution improved the electrochemical capacity of the electrode in seconde reaction.Adopting pasted preparing-tecnology of electrode, mixture of graphite and acetylene as conductive agent and 3.8%PTFE as binder, the electrochemical activity of the MnO2 electrode was better, the discharge capacity was higher.Finally, doping effects of as-prepared nano MnO2 into EMD was studied.Theresult showed that adding 8% of nano MnO2 into EMD, the electrochemical activity of EMD electrode, and its performance in deep and shallow discharge region was improved.