Study On The Preparation Of Carbon-based Composite By Microwave Method And Their Performance In The Negative Electrode Of Lead-carbon Battery

With continuous development of society,lead-acid batteries are often used in high-rate partial charge state(HRPSoC),which also cause irreversible sulfation of the negative electrode and thus reduce the service life of lead-acid batteries.In order to overcome this effect,researchers invented lead-carbon batteries,that is,adding a small amount of carbon material to the negative active material of lead-acid batteries.Although the addition of carbon material in the negative electrode can inhibit its irreversible sulfation and increase the specific surface area of the negative electrode material,the carbon material will produce serious hydrogen evolution within the working potential range of the negative plate of the lead-acid battery.At present,the above-mentioned problems are still not well solved.Therefore,this paper used the characteristics of rapid,high-efficiency and pollution-free preparation of microwave materials to prepare various lead-carbon composite materials by microwave method,and investigated the effects of various composite materials and their content on the hydrogen evolution performance of the negative plate and the battery HRPSoC.It was found a suitable lead-carbon composite material can not only improve the cycle life of lead-carbon battery HRPSoC,but also significantly inhibit the hydrogen evolution of the negative plate.The main research content of this paper consists of the following three aspects:(1)A new type of carbon black composite(PbSO₄@Pb/C)loaded with nano-lead sulfate-lead was prepared by in-situ loading and microwave methods,and the characteristics and characteristics of the composite were analyzed by XRD,XPS,SEM and electrochemical testing methods.The electrochemical performance was characterized and analyzed.It was found that the HRPSoC life(24,513)of the battery with 3 wt%PbSO₄@Pb/C composite is 8.5 times that of the battery(2,880)with the same amount of original carbon material,and 31.2 times that of the blank battery(785).At the same time,the composite can also obviously inhibit the hydrogen evolution effect brought by carbon black.(2)Using the synthesis method of the above materials,another composite containing lead sulfate-lead acetylene black composite(PbSO₄@Pb/AB)was prepared,and the battery with 3 wt%PbSO₄@Pb/AB composite was added with a high-rate partial charge state.The HRPSoC life(12,834)is 4.1 times that of a battery with the same amount of original carbon material(3,118)and 16.3 times that of a blank battery(785).At the same time,the composite also has the effect of inhibiting the hydrogen evolution of carbon materials.(3)Another composite lead sulfate-multi-walled carbon nanotube composite(PbSO₄/MC)was prepared again,and 2 wt%PbSO₄/MC composite material was added to the negative plate not only to have 1,653 HRPSoC cycle life but also better than the blank The battery has a smaller hydrogen evolution reaction.The HRPSoC cycle life of a lead-carbon battery with 3 wt%PbSO₄/MC composite is 3,752 times,which is 4.8 times that of a blank battery.