炭黑与石墨混合炭材料对铅酸电池负极性能的影响

Infl uence of composite material of carbon black and graphite on the performance of negative electrode of lead-acid battery

本文考察了加入不同含量混合炭材料(如炭黑与石墨)的铅酸电池负极的电化学性能。通过循环伏安测试,研究了炭材料对负极氧化还原性能与析氢电位的影响。通过扫描电镜测试,观察了负极微观形貌的变化。充放电测试结果表明,铅酸电池负极活性物质中炭材料的含量对其倍率放电性能具有重要影响。适量添加炭黑与石墨的混合材料,可以提高负极高倍率条件下的放电容量。当添加3%炭黑和2%石墨混合炭材料时,对负极充电时的析氢电位影响较小,10 C放电条件下得到较高容量。

This paper observed and studied the electrochemical performance of negative electrode of lead-acid battery, while the negative electrode was added into different content of composite carbon material such as carbon black and graphite. The infl uences of carbon material on redox properties of negative electrode and hydrogen evolution potential were studied by cyclic voltammetry measurements. The micro morphology of negative electrode was characterized by SEM. The results of chargedischarge tests showed that when the carbon material was added into the active materials of negative electrode of lead-acid battery, its content had an important effect on the discharge performance. The composite material of proper content carbon black and graphite could improve the discharge capacity at high rates. When 3 wt% carbon black and 2 wt% graphite were added, the effect on hydrogen evolution potential is smaller during charging and the capacity is higher under the condition of 10C discharging.