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Study On The Effect Of 4BS Seed Paste And Lanthanum-doped Alloys On The Performance Of Power Lead Acid Battery

Posted on:2018-05-29Degree:MasterType:Thesis
Country:ChinaCandidate:B S AiFull Text:PDF
GTID:2382330566997514Subject:Chemical engineering
Abstract/Summary:PDF Full Text Request
The development of high capacity and long life power lead acid battery is the key to energy conservation and emission reduction.In order to improve the performance of power lead-acid battery,especially its cycle performance,4BS is introduced to the positive paste in this work.Firstly introducing 4BS seed crystals into lead paste,the performance indexes of lead paste are improved in order to solve the problem Material softening off the battery caused by the early capacity of the battery attenuation,improve battery cycle life.Second,the mechanical properties and electrochemical performance of lead-acid battery grid alloy is improved by the addition of rare earth element lanthanum into the traditional lead-calcium alloy.Experiments were carried out by X-ray diffraction(XRD),electron microscopy(SEM)and so on.Electrochemical tests were performed on electrochemi cal workstations.The battery charge and discharge performance is performed with national and corporate standards.1% 4BS is introduced in the paste as a crystalseed of 4BS,which could lead to the formation and increasingof 4BS in the plate.The results shows that the formation of 4BS crystals was fine uniform,which could greatly improve the plate.With the study of high temperatureformation process,t he consistency of the traditional high-temperature process to avoid the formation of large crystals which leads to the difficulties of the formation and the low initial capacity.The introduction of 4BS seed crystals increased the porosity of the lead paste,which was beneficial to the entry of oxygen into the inside of the lead paste,which made the curing easier,improved the efficiency of the formation,decreased the free lead content and enhanced the adhesion between the plates.The performance of the 4BS crystal is improved by the electrical performance test.The initial capacity,the low temperature capacity and the high current discharge performance are improved to some extent.This shows that the introduction of the 4BS crystal can shorten the product ion time and improve the production time.Plate plate into the efficiency and consistency,reducing the uneven distribution of the distribution rate,product performance to extend the battery life.0.0025% lanthanum is added into plate grid alloy as additi ve,and the content of tin in tin lanthanum lead calcium alloy is optimized to be 2.06%,in order to develop a new plate grid alloy with fine mechanical properties and better electrochemical properties,The results show that the addition of lanthanum elements has improved the hardness of alloy and shortened the time of hardening.The alloy grain after adding lanthanum elements become regular and uniform distribution.Lanthanum elements to improve the plate grid alloy hydrogen evolution of oxygen evolution po tential,lower corrosion current and finally improves the corrosion resistance of plate grid alloy,corrosion holes on the membranes of the distribution more uniform,is advantageous to the active material attached.The formation of corrosion film is very important to the hydrogenation of oxygen,so it can inhibit the loss of water and improve the performance of lead-acid batteries.When the content of tin in the alloy is 2.06%,the hardness of the alloy increases obviously,while inhibiting the ability of hydrogen and oxygen dissociation is improved,and the large current discharge performance and cycle life of the battery are improved greatly.
Keywords/Search Tags:Power lead acid battery, 4BS seed crystal, Lead calcium lanthanum tin grating alloy, Battery life, Lead paste
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