超级蓄电池用PbO/AC复合材料制备改进研究

Improved synthesis of PbO/AC composite for ultra-battery

采用目前商业化活性炭材料结合喷雾干燥技术制备了超级蓄电池用PbO/AC复合材料。PbO/AC复合材料经表面改性后比重为活性炭材料的4倍,有利于与铅粉混合。CV及LSV分析表明,PbO/AC复合材料较普通AC材料-0.9 V下析氢电流下降,运用到超级蓄电池负极;采用扫描电镜(SEM)和X衍射分析(XRD)对PbO/AC负极板在充放电过程中形貌和组成作了详细描述,分析了PbO/AC对提高大倍率放电能力及抑制析氢现象的机理。实验证明:采用PbO/AC复合材料负极,提高了超级蓄电池大电流充放电能力,在高倍率部分荷电循环测试中,超级蓄电池循环寿命达到20 000次以上。

The improved PbO/AC composite used for ultra-battery negative plates was prepared by commercial active carbon materials with spray-drying technology. Data analysis shows that the density of PbO/AC composite increased by 4 times after modification, which made it easy mix with lead oxide. Analysis of CV and LSV shows that the hydrogen evolution current of PbO/AC composite decreases greatly at potential of -0.9 V compared to normal active carbon materials. The microstructure of PbO/AC composite was characterized with SEM and XRD during charging-discharging process. The mechanism of improved high-rate-discharge performance and restrained hydrogen-evolution with PbO/AC materials was studied. The cycle life of ultra-battery estimates more than 20 000 cycles during the HRPSoC test.