Modification And Preparation Of The Pb-C Ultrabattery

In recent years, the research about the Pb-C battery and ultrabattery has gradually been attention. However, the addition of carbon materials also exists some problems. Especially, the poor mixing uniformity and binding force of carbon material and the lead powder. So the modification of carbon materials is the research key.In this paper, taking the preparation and modification of carbon materials and lead powder as a starting point, different carbon material are prepared with lead powder to get different structure composites; the material structure is characterized by the methods of XRD, SEM and TEM; We analyze the electrochemical performance of the materials by CV curves and LAND system test, respectively. The research content is as follows:The C@Pb composites are prepared with the modified glucose as carbon source by the liquid coating and high temperature carbonization method, which are used as the negative materials. Crystal structure and surface morphology of the materials were characterized by XRD and TEM, the results show that the carbon coating layer is on the surface of the composite materials and does not affect the type of lead oxide crystal structure. By CV scanning test, the indium oxide and bismuth oxide has good hydrogen evolution inhibition effect, and the indium oxide is best, and the specific capacitance of composite is improved significantly. Through LAND battery testing system, the initial capacity of the C@Pb composites is obviously improved, and the charge and discharge performance and cycle performance has been greatly improved. This is due to that lead powder coated uniformly with carbon not only restrain the reunion of the lead active substances, but also reduce the bare area of lead active materials in the electrolyte.In the above-mentioned study, we choose indium oxide as a hydrogen evolution inhibitor to modify the graphite, and which is mixed with lead powder with a small amount of glucose as a adhesive. And the graphite/lead powder composites are prepared as a negative materials. Crystal structure and surface morphology of the materials were characterized by XRD and TEM, the results show that the existence of graphite characteristic peak in the composites, and it does not affect the crystal structure of lead oxide. Through the CV scanning test, it has verified indium oxide has excellent effect on inhibition of hydrogen evolution again and obviously improves the specific capacitance of the composites. The test battery was assembled with the best composite materials. The results show that the initial capacity battery is the obvious ascension and the charge and discharge property and cycle performance has been greatly improved by the electrochemical performance test. Because the graphite sheets were dispersed among lead powders, which can provide fast electron transfer and increase the conductivity of the material.Lead powder modified by cetyl trimethyl ammonium bromide (CTAB) surfactant, which make it produce positive charge, the GOS@Pb composites were prepared by the electrostatic adsorption in solution. Then the GNS@Pb composites were prepared through high temperature sintering reduction, which used as a negative materials. Crystal structure and surface morphology of the materials are characterized by XRD, SEM and TEM, the results show that the existence of obvious characteristic peak of graphene in the composites, and it does not affect the crystal structure of lead oxide under the environment of high temperature. Through SEM and TEM test We found that lead powder were coated on the surface of the irregular graphenes, and graphenes have no reunion phenomenon in the composites. Many graphene sheets extending outward on the material surface not only will form a conductive network structure, but also will make lead powder dispersed evenly, which were used as a Pb-C ultrabattery negative materials. Through the CV scanning test, the results show that the GNS@Pb/in composites has excellent effect on inhibition of hydrogen evolution and high specific capacitance. The test battery was assembled with the GNS@Pb/in composites. The results show that the initial capacity battery is the obvious ascension and the charge and discharge property and cycle performance has been greatly improved by the electrochemical performance test. Main reason is that the composites prepared by electrostatic adsorption improve the dispersity and utilization rate of lead powder, and the huge graphene conductive network can accelerate the electron transfer and electrolyte penetration rate, which accelerates the transformation of lead sulfate and lead.