Synthesis And Electrochemical Performance Of Tribasic Lead Sulphate

At present,the production of lead-acid batteries in industry uses PbO,which contains about 15%of the metal lead.The study found that the negative plate produced tribasic lead sulphate?3BS?during the curing process.The plates need to solidify 48 h at 70?C,which will consume energy and occupy a large number of factory space.If 3BS can be chemically synthesized and used directly as a battery active material,it is possible to reduce costs and improve the uniformity of the plate.Therefore,we studied the synthesis of 3BS and its electrochemical performance as positive and negative active materials in lead-acid batteries.It was found that 3BS can be easily obtained by using PbO and H₂SO₄ for 4 h at30?C.SEM shows that the 3BS powders are flaky crystals with lengths of 4⁸?m,width of 1³?m,and thickness of 0.1⁰.2?m.As a negative electrode active material for a lead-acid battery,compared to electrodes made of?-PbO,?-PbO and an industrial negative electrode,using 3BS as a negative electrode active material electrode after formation has a uniform and dense porous structure.3BS electrode shows much better performance,which discharges a capacity of 91 mAh·g^-1 at 120mA·g^-11 after 10 100%DOD?depth of discharge?cycles in a flooded cell,and maintains that value for more than 100 cycles.3BS electrode has the same performance without curing.The performance of 3BS as a positive electrode active material for lead-acid batteries was studied.The discharge capacity was 100 mAh·g^-1 under 100 mA·g^-1discharge current density and 100%discharge depth?DOD?.Different mass fractions of 5%,10%,20%,30%,40%and 50%of tetrabasic lead sulfate?4BS?were added to the 3BS electrode,at a discharge current density of 100 mA·g^-1,and the discharge capacity is 80⁹0 mAh·g^-1.The curing cycle of 3BS curing for 24 hours and without curing is stable.It is stable at the current of 90 mAh·g^-1 from the 4th cycle to the100th cycle.The rate cycling under the two different discharge systems is also very close.Eliminate the curing step is possible.