| The energy market has put forward new requirements of"lightweight and high energy"for secondary power supplies.This is a major challenge for the lead-acid battery,which is heavy in quality and short in life.In addition to the active material,the current collector grid accounts for the most mass in the battery.Without sacrificing battery capacity,the lightweight of the grid has become an effective means to enhance the market competitiveness of lead-acid batteries.In this study,fluoroborate lead electroplating system was used,and lead-plated light metal grids were proposed to replace traditional grids for the production of lead-acid batteries,and the selection of light metal negative grid materials more suitable for the working environment of lead-acid batteries was explored.In this way,battery performance can be optimized,battery cycle performance can be enhanced,and a valve-regulated lead-acid battery with lower cost and better performance can be obtained.In this paper,aluminum alloy and copper alloy were used as grid base materials,electroplating was carried out on their surface,and they were used as the negative grid of lead-acid batteries to assemble valve-regulated lead-acid batteries.The industrial feasibility of the lead-plated light metal negative grid was verified by testing the performance of the electrode plate and the battery.From the perspective of cost reduction and environmental friendliness,it was explored whether lead-plated light metal can still be used in the negative electrode of lead-acid battery after participating in the battery cycle,verifying the feasibility of realizing reuse without redundant processes in valve-regulated lead-acid batteries.The main conclusions are as follows:1)The lead-plated aluminum-based stretched grid was used as the negative electrode of the lead-acid battery,and the initial capacity after assembly into the lead-acid battery was about four-fifths of the conventional battery of the same model.Its coulombic efficiency was88.41%.After only 43 cycles of 100%DOD,the capacity was not up to the standard,and its life is over,far less than the national standard GB/T22199.1-2017 stipulates that 100%DOD has more than 350 cycles.2)The dissected appearance of the lead-plated aluminum substrate grid shows that the coating was damaged,and the aluminum substrate was exposed.The aluminum sulfate（Al2（SO4）3）generated can absorb water to generate Al2（SO4）3·18H2O.Battery performance had dropped significantly.3)The lead-acid cell（TBGC）assembled with the lead-tin-bronze grid as the negative electrode had stronger charge and discharge acceptance.Compared with conventional cell,the active material utilization rate of TBGC was increased by 19%,32%,36%,and 33%at discharge rates of 2 h,5 h,10 h,and 20 h,respectively.During the cycle,the PAM utilization rate of TBGC was almost 50%,while that of conventional cell of the same type was about37.5%.4)The mass specific capacity of TBGC was close to 41.2 Wh·Kg-1under the condition of2hr,and the mass specific capacity of conventional cell was about 33.8 Wh·Kg-1.Compared with the conventional negative grid,the weight of each tin bronze grid was reduced by about17 g,and the weight of a single cell was reduced by 13.67%.5)The tin-bronze grid as the negative electrode can reduce the voltage drop of the electrode plate,and make the charge and discharge of the electrode plate uniform.It inhibited the growth of coarse lead sulfate crystals in the discharge state.The strength of tin bronze will weaken or even offset the deformation of the negative electrode grid caused by the expansion and deformation of the positive electrode,thus avoiding the short circuit between the positive and negative electrodes.6)The reused tin-copper grid was feasible as a lead-acid battery negative grid,its electrochemical performance is almost unaffected,supports the normal operation of the battery,and effectively inhibits the sulfation of the negative grid. |
