Preparation And Study Of Lead Material Energy Storage Equipment

Although lead-acid battery is the world's most used second power nowadays, the existing defects, such as low specific energy and short life cycling can not meet with the applications in energy storage and traction battery. So the study of carbon foam used as the current collector in lead acid battery became more attractive. The emergence of ultrabattery makes the study of supercapacitor become popular. We used Ti as substrate to prepare Ti/PbO2 electrode, which was combined with active carbon to assemble supercapacitor, and tested its performance. The main contents of this thesis are showed as follows:1. Carbon foam was produced by graphite and phenolic resin through template method. Electrochemical Impedance Spectroscopy method was used to test its resistance. The result showed that carbon foam has high electrical conductivity which can be used as lead-acid battery anode current collector. Carbon foam coated with lead paste was assembled with common positive plate to form a battery. Then charge and discharge tests were performed and the results showed that carbon foam has a good cycling characteristic. The mass ratio of phenolic resin and graphite powder were varied to prepare carbon foams, the results of battery test showed that the battery has good performance when the mass ratio of phenolic resin and graphite powder was 1.5:1.2. The PbO2 were electrodeposited on Ti electrodes which were respectively coated with gold, different layers of SnO2/Sb2O3, or uncoated. Then the different PbO2 electrodes were conducted with cyclic-voltammetric measurements, we concluded that the uncoated can't be used as electrode. The PbO2 deposited on gold and on ten layers of SnO2/Sb2O3 had similar performance. Considering the price, we chose Ti/SnO2/Sb2O3 as substrate to prepare PbO2 electrode.3. Ti/PbO2 electrode was prepared by means of electrochemical deposition. PbO2/AC super-capacitor was assembled by PbO2 and active carbon (AC). Effects of different lead salts on the discharge capacity of electrodeposited PbO2 electrode were studied. It was shown that the PbO2 electrode prepared by sodium hydroxide solution containing Pb(CH3COO)2 had the largest capacity. Sodium hydroxide solutions with different concentration were used to prepare saturated lead acetate electrolytes. PbO2 electrode was prepared, and discharge test of PbO2/AC super-capacitor was conducted. Two PbO2 electrodes prepared by the optimized method were employed as anode, while AC and pasted lead electrode were employed as cathode, constructing the PbO2/AC super-capacitor and lead acid battery respectively. Then, the charge/discharge tests with large current were conducted, and the results indicated that the performance of super-capacitor was far superior to the performance of lead acid battery.