Modification Of Biomass Carbon And Its Application In Lead Carbon Batteries

Lead-carbon batteries,owning the advantages of lead-acid batteries and supercapacitor,poossess excellent low temperature performance,large current discharge property and long cycle life.Lead-carbon batteries can replace lead-acid batteries in energy storage and power supply field,thus considerable institutions have carried out research on lead-carbon batteries,but there is a distance to achieve large scale industrialization.In this paper,we chose carbon materials,evaluated the feasibility of industrial production lead carbon batteries.Nano PbO@RHC and nano Pb₃?CO₃?₂?OH?₂@RHC were prepared through chemical precipitation,both of them increase the hydrogen evolution over potential of RHC,and performance of lead-carbon batteries is further improved.this paper also preliminarily explores the application of carbon materials in the positive electrode.?1?Selection and application of carbon materials.The physic-chemical properties of four types of carbon materials?biomass carbon?RHC?,carbon black?CB?,carbon nanotube?CNT?and graphene nanosheet?GNS??were tested and analyzed.The results showed that the hydrogen evolution potential,specific surface area and specific capacity of RHC were the highest.Then,four carbon materials were added to the negative plate in different proportions for capacity test.The results showed that the RHC content was 1.0 wt.%and 0.5 wt.%,which were the two groups with the highest capacity.Finally,the 0.5 wt.%RHC formula was introduced into the production line of tongba company to make lead-carbon battery.Its room temperature capacity,low temperature capacity and the self-discharge performance were tested.The results showed that the overall performance of 0.5wt.%of RHC lead battery was better than that of commercial battery,and the room temperature capacity was 6.88%higher than that of commercial battery,-18?low temperature capacity 8.47%higher than that of commercial batteries;The self-discharge?placed for 100 days?was 6.00%,and the national standard?placed for 30 days?was no more than 15%,meeting the production standard.?2?The modification of carbon materials.Nano PbO@RHC and nano Pb₃?CO₃?₂?OH?₂@RHC were prepared by chemical precipitation method.Studies show the loaded particles are uniformLy distributed with a diameter of less than200nm,and the components are PbO and Pb₃?CO₃?₂?OH?₂.The loadings of PbO and Pb₃?CO₃?₂?OH?₂ were 56.41 wt.%and 55.74 wt.%.The two composite materials were both-1.52 v,which improved the hydrogen evolution overpotential of the RHC.The two kinds of composite materials were added to the negative electrode plate at a ratio of 0.5 wt.%to test the capacity multiplier performance.The discharge capacity of the plate is increased,but not obviously.?3?Research on the effect of carbon material additive in positive electrode.The physic-chemical properties of four types of carbon materials?biomass carbon?RHC?,carbon nanotube?CNT?,charcoal powder?CP?,and graphite?G??were tested and analyzed.The results showed that the conductivity of RHC,CNT,G were similar,and that of CP was the worst;RHC had the highest of specific surface area and oxygen evolution potential;RHC had the lowest of specific surface area and oxygen evolution potential.Then four carbon materials were added to the negative plate in different proportions?1.0 wt.%,2.0 wt.%?to test the capacity multiplier performance.The results show that carbon with good electrical conductivity is conducive to the formation of positive electrode plate,and the large hole formed after the oxidation of large carbon particles can make the electrolyte enter the positive plate in time and improve the capacity of positive plate.