| Electrochemical power is a device that directly changes chemical energy into electrical energy. As a highly efficient, clean and convenient energy, electrochemical power has been extensively studied and applied in the 21st century. Zn-Mn battery is one of the commonly-used batteries in our daily life. Measuring the content of manganese dioxide in waste and new Zn-Mn batteries will provide a theoretical basis for the study on making the most use of the electro-active substance. Ionic liquid is a novel and green electrolyte. Studying of the application of ionic liquid in the cell will provide academic and applied values in exploiting new types of batteries and improving the capability of batteries. In this paper we have done some researches as follow:Firstly, a new method was proposed to determine the content of active substance in waste batteries. The graphite and acetylene black are added to a anode material in making Zn-Mn battery, therefore the sample solution prepared appears as feculency and the titration end point of the solution is difficult to judge when active manganese dioxide in the battery is determined by iodimetry with starch as indicator. In this article, a new analysis method for determination of the content of active manganese dioxide left in a waste Zn-Mn battery was proposed by iodimetry combined with potential titration. The results show that our method is rapid, efficient, accurate, high precision through choosing optimal conditions. To enhance the utilization of active oxide, further studies should be focused on the improvement of the battery's structure and the selection of the best carbon and manganese ratio.Secondly, the application of ionic liquids in batteries. This work including the following three parts:(1) On the base of abundant literature, three ionic liquids were synthesized. The middle products, [bmim]Br and [bmim]Cl, were synthesized used low poisonous ethylacetate. The method possesses some advantages, such as operating more easily and higher yield. The prepare result of the water-soluble ionic liquids [bmim]BF4 shows that the synthetic cost was decreased under guaranteeing the purity of products.(2) The electrolyte of battery was prepared in this part. ZnCl2 /[bmim]Cl, [bmim]PF6, [bmim]BF4, CAN were incorporated into electrolyte. Ionic conductivity and electrochemistry were tested. The result shows that when the volume ratio of IL/CAN is 1:1, electrolytes had the highest ionic conductivities (1.0×10-2S/cm). While the result of cyclic voltammograms shows that when the volume ratios of IL/CAN is 2:1, the performance of cyclic voltammograms is perfect. The above results will provide a foundation for ionic liquid applying in the battery as electrolyte.(3) Self-produced battery's capability was determined in this section. At the existing conditions, we discussed primarily on the application of the ionic liquid/CAN electrolyte to Ag/Zn secondary cell. The result shows that the Ag/Zn cell of self-restraint has small local action, long deposition; the battery internal resistance decrease as the temperature increase gradually and finally stabled at 75℃, so it is more likely to be used in the environment of high temperature. By charging and discharging repeatedly, the voltage was still stable as well. But the capability is small due to the limited experimental conditions, the capacity of the batteries was small and the charging and discharging capability was imperfect. So the battery's structure needs further improvement. It will provide a foundation for new cell researches.
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