Preparation And Properties Of Lead-Acid Battery Cathodes With Nanometer Lead Dioxide/Carbon Composites

With the increasing demand for energy,traditional energy sources have been unable to meet,and a large number of fossil fuels have seriously affected the local ecological environment.Various countries have given great support to the development of renewable energy and new energy.Lead-acid batteries have low price,easy maintenance,low environmental requirements,high safety and recycling.Today,lead storage batteries are increasingly being used for renewable energy storage,including solar power plants,wind power plants,and microgrids.It is well known that the positive electrode of lead-acid battery produces inreversible sulfuric acid salinition in the charge and discharge process and the utilization rate of the active material lead dioxide is low.To some extent,these disadvantages limit the application of lead-acid batteries.This subject mainly studies the composite modification of lead dioxide and carbon materials with excellent performance,and explores the structure,morphology and electrochemical properties of the materials.Lead dioxide/graphene composite was prepared by precipitation combined with two steps of hydrothermal.The?-PbO₂/rGO composite electrode has higher specific capacity than pure?-PbO₂.The mass specific capacity of PbO₂/rGO reaches 310mAh g^-1(the specific capacity of the current collector is 98.7 mAh g^-1 at a current density of 1 A g^-1)compared to pure PbO₂ electrode(242.5 mAh g^-1)increased by27.8%at 1 A g^-1 current density.Electrodeoxidation method was used to prepare lead dioxide/graphene electrode.The electrochemical test results showed that the mass specific capacity of PbO₂/rGO reached 335.3 mAh g^-1 at 1 A g^-1 current density(the specific capacity of the current collector is 98.7 mAh g^-1 at a current density of 1 A g^-1)compared with pure PbO₂electrode(246.1 mAh g^-1)Increased by 36.2%.Comparing with the two sets of impedances of the first system,it is known that lead dioxide formed by electrooxidation of lead oxide has a lower impedance,thereby making it have better electrochemical performance.The?-PbO₂/DMC nanocomposites were synthesized by chemical precipitation combined with hydrothermal synthesis.Due to its high specific surface area,abundant pores and better conductivity,DMC greatly improves the electrochemical performance of the composite.When the current density is 1 A g^-1,the capacity of?-PbO₂/DMC is increased compared with the pure material 94%.