Synthesis of Organic Acid Doped Polypyrrole and Its Evaluationas a Novel Cathode Material

Using pyrroleand benzene carboxylic acid as raw materials, composite materials (BeAcLi/PPy) were successfully prepared by redox method. The structures, morphologies and battery performances of PPy and the composite materials (BeAcLi/PPy) were obtained with FTIR, SEM, CVand EIS. Battery performances of PPy andcomposite materials (BeAcLi/PPy) were obtained with a constant charge/discharge current. Test results revealed that PPy and the composite materials (BeAcLi/PPy) had reversible redox processes from 2.0-4.0 V. Thedischarge specific capacities of BeAcLi/PPy (3:1) and BeAcLi/PPy (5:1) were 74.5 and 57.8 mAh·g -1 , respectively, as measured at 20 mA·g −1 between 2.0 and 4.0 V; these results were evidently better than that of PPy (29.7 mAh·g -1 ) under identical experimental conditions. Additionally, the rate performances and cycling performances of the composite materials significantly improved. The excellent electrochemical performances of composite materials were mainly due to the introduction of BeAcLi as a dopant, thereby improving the polarization of PPy. In addition, the prepared composite materials had a uniform and open loosely stacked structure, which was conducive for increasing contact area between electrode material and electrolyte. As a result, the availability of active material improved, and the electrochemical properties improved.