PbSO_4/活性炭复合材料的制备和电化学性能

Preparation,Characterization and Electrochemical Performance in H_2SO_4 Electrolyte of PbSO_4/AC

通过对活性炭进行Pb(II)吸附、PbSO4沉积等处理,制备了PbSO4/活性炭复合材料,并对其进行表征。结果表明,200 nm以下的PbSO4晶体均匀地分散在活性炭颗粒表面,Pb的质量分数为26.43%。将PbSO4/活性炭复合材料制备成电极,在H2SO4电解液中进行的电化学性能测试结果表明,该材料具有较高的析氢过电位,并能提供一定的Faraday电流,非Faraday比容量有所损失。将氧化铅粉量5%的PbSO4/AC添加到电池负极铅膏中,所制得的电池在60%SOC下的高倍率循环寿命比普通铅蓄电池提高了3-4倍。

PbSO4/activated carbon composite （PbSOJAC） was prepared by the processes of adsorption of Pb^2＋ and deposition of PbSO4 on the surface of activated carbon. The composite was characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）. The results showed that PbSO, crystals （about 200 nm） uniformly dispersed on the surface of the activated carbon particles and the content （mass fraction） of lead element in the sample was 26.43%. The electrochemical measurements in H2SO4 aqueous solution showed that PbSOdAC possessed high over-potential of hydrogen evolution, high electrical conductivity and could provided a certain degree of oxidation-reduction current. Moreover, the loss of non-faradic specific capacitance was small. The ultrabattery was fabricated in which the negative plate was prepared by adding 5% PbSOdAC （related to leady oxide） to the negative paste. Initially, the battery was discharged to 60%SOC and then subjected to the test of cycling performance at high rate. The cycle life of the ultra-battery was 3-4 times higher than that of traditional lead-acid battery.