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碳酸钾或碳酸钠颗粒作催化剂基底,采用化学气相沉积(CVD)制得类似于石墨烯的层状碳材料,并经原位化学沉积可得层状碳/硫酸铅复合材料.用X射线衍射(XRD)、热重分析、扫描电镜(SEM)和透射电镜(TEM)分析与测试样品.结果表明,层状碳为无定型碳层,复合材料为无定型碳层与附着其上的细小硫酸铅颗粒的复合.上述层状碳和复合材料作为负极添加剂应用于铅酸电池中,测试了电池电化学性能.结果表明,电池大电流放电比容量和循环寿命均明显提高.通过电化学交流阻抗谱图(EIS)、充放电曲线和负极失效后的SEM照片证实,加入添加剂能够降低负极板的欧姆阻抗和电化学反应阻抗、减小极化及有效抑制极板硫酸盐化.
Potassium carbonate or sodium carbonate particles as a catalyst substrate, a layered carbon material similar to graphene was prepared by chemical vapor deposition (CVD), and a layered carbon / lead sulfate composite material was obtained by in situ chemical deposition. (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the layered carbon is an amorphous carbon layer and the composite is an amorphous carbon layer with small sulfuric acid Pb particles.The composites were used as negative additives in lead-acid batteries and the electrochemical performance of the batteries was tested.The results showed that the specific discharge capacity and cycle life of the batteries increased obviously.The electrochemical impedance Spectroscopy (EIS), charge and discharge curves and SEM images after failure of the negative electrode confirmed that the addition of additives can reduce the ohmic and electrochemical reaction impedance of the negative plate, reduce the polarization and effectively inhibit plate sulfation.