The Research Of Charging And Discharging Progess For LI-polyaniline Battery

Polyaniline is a novel conductive polymer, it has attracted attention widely because of its unique advantages such as electrochemical stability and environment-friendly features in the field of secondary battery. In this paper, using reductant J prepared polyaniline with different oxidation degrees and studied its structural characterization and functional group species. According to the charging and discharging test and EIS test, the effects of many factors about the battery’s performance and internal reactions like membrane complex, electrolyte concentration, oxidation of polyaniline and pressure was studied. Then, the charging and discharging mechanism of lithium-Polyaniline battery was discussed.By conductivity measurements, it found that the degree of oxidation is almost independent of the conductivity of polyaniline, however, the conductivity significantly increased by doping. Polyaniline contains the functional groups like the benzene ring,-NH2, C=N, and quinone structure by infrared spectrum tests. After doping, C=N double bond has the longest mobile, it showed that doping occurs on the quinone structure. Through XRD tests we found that with the increase of oxidation degree of polyaniline, the crystallinity of polyaniline declines, after doping, the crystallinity significantly increased. Through SEM tests, it showed that the morphology of polyaniline change from fluffy porous to sheet structure.By studying the charging and discharging process of lithium battery w ith different dopants in polyaniline, it identified while only perchloric acidas dopant, polyaniline can be used in lithium batteries. Through studying the relationship between electrolyte and battery capacity, it concluded that capacity increases as the electrolyte concentration increases. Doping rate w ill only affect the first discharging capacity of the battery, when the batter y is stable, it has nothing to do with capacity. When the membrane comp osed of polypropylene and AGM separator, the battery capacity is best. W hile the increase in quality of polyaniline, the capacity of battery will decl ine. Under pressure of 2 Mpa, only the doped polyaniline could be chargi ng and discharging as normal, the eigenstate polyaniline lose the ability tocharge and discharge. Through the above research, we concluded that in t he charging and discharging process of the lithium-polyaniline battery, the polyaniline only existing doping and de-doping reaction, it does not exist t he reaction of extraction and embedded of lithium ions. Therefore, there isno obvious charging and discharging platform in lithium-polyaniline batter-y.Finally, It described the current distribution of the secondary battery market and applications of lithium batteries. Then it calculated the cost of PANi through the synthesis in the laboratory, almost 20 yuan / kg. Compared with other cathode materials, polyaniline price advantage is obvious.