In order to increase the specific energy and specific power of a lead-acid battery, lead foam grid was prepared by electrodepositing Pb-Sn alloy on a copper foam substrate and used as negative current collector for a ...In order to increase the specific energy and specific power of a lead-acid battery, lead foam grid was prepared by electrodepositing Pb-Sn alloy on a copper foam substrate and used as negative current collector for a lead acid battery whose capacity was limited by the negative plate. Comparing the effect of the cast grid, under the same conditions, the mass of lead foam grid decreases by 35%, and the area of lead foam contacted with active material increases by about 20 times. Under 2 h rate discharge condition, with a high current （3 0 I2） e and low-temperature （-10 ℃, I2） discharge system, the lead foam grid markedly boosts the discharge performance of lead acid battery. It increases not only the negative electrode mass specific capacity by 27%,37% and 29%,but also the utilization efficiency of the negative active material by 5%. Compared with the negative electrode of cast grid, XRD and SEM results show that after 20 cycles at the state of charge, the sponge lead in the negative lead foam electrode has smaller crystals and less PbSO4 on its surface. Meanwhile, at the state of full discharge, the PbSO4 crystals are smaller and occur less on the surface of lead foam electrode. This indicates its active material reacts more uniformly.展开更多
The surface morphology and composition of negative active material (NAM) both on the cast grid and on lead foam grid at the state of charge and discharge, in valve-regulated lead acid (VRLA) battery, were characterize...The surface morphology and composition of negative active material (NAM) both on the cast grid and on lead foam grid at the state of charge and discharge, in valve-regulated lead acid (VRLA) battery, were characterized by SEM and XRD, respectively. Moreover, the specific surface area and electrochemical impedance of the negative active material for both negative electrode grids were studied by chronoamperometry and EIS.The result indicates that after lots of cycles, compared with the cast grid, the sponge lead of the lead foam negative plate is smaller; the specific surface area increases by about 16%; the residual PbSO4 on the surface of the electrode is less at the state of charge. At the state of discharge, PbSO4 crystals on the surface of the negative plate of lead foam are smaller, and the specific surface area increases to 209%. EIS analysis shows that compared with the negative plate of cast grid, no matter what state the negative plate of lead foam is at, the electrochemical impedance of the material is lower.展开更多
文摘In order to increase the specific energy and specific power of a lead-acid battery, lead foam grid was prepared by electrodepositing Pb-Sn alloy on a copper foam substrate and used as negative current collector for a lead acid battery whose capacity was limited by the negative plate. Comparing the effect of the cast grid, under the same conditions, the mass of lead foam grid decreases by 35%, and the area of lead foam contacted with active material increases by about 20 times. Under 2 h rate discharge condition, with a high current （3 0 I2） e and low-temperature （-10 ℃, I2） discharge system, the lead foam grid markedly boosts the discharge performance of lead acid battery. It increases not only the negative electrode mass specific capacity by 27%,37% and 29%,but also the utilization efficiency of the negative active material by 5%. Compared with the negative electrode of cast grid, XRD and SEM results show that after 20 cycles at the state of charge, the sponge lead in the negative lead foam electrode has smaller crystals and less PbSO4 on its surface. Meanwhile, at the state of full discharge, the PbSO4 crystals are smaller and occur less on the surface of lead foam electrode. This indicates its active material reacts more uniformly.
文摘The surface morphology and composition of negative active material (NAM) both on the cast grid and on lead foam grid at the state of charge and discharge, in valve-regulated lead acid (VRLA) battery, were characterized by SEM and XRD, respectively. Moreover, the specific surface area and electrochemical impedance of the negative active material for both negative electrode grids were studied by chronoamperometry and EIS.The result indicates that after lots of cycles, compared with the cast grid, the sponge lead of the lead foam negative plate is smaller; the specific surface area increases by about 16%; the residual PbSO4 on the surface of the electrode is less at the state of charge. At the state of discharge, PbSO4 crystals on the surface of the negative plate of lead foam are smaller, and the specific surface area increases to 209%. EIS analysis shows that compared with the negative plate of cast grid, no matter what state the negative plate of lead foam is at, the electrochemical impedance of the material is lower.
