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Journal of Electrochemistry ›› 2020, Vol. 26 ›› Issue (6): 834-843.  doi: 10.13208/j.electrochem.200306

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Effect of Stereotaxically-Constructed Graphene on the Negative Electrode Performance of Lead-Acid Batteries

Chen Pin-song, Hu Yi-tao, Zhang Xin-yi*(), Shen Pei-kang*()   

  1. Collaborative Innovation Center of Sustainable Energy Materials, Guangxi University,Nanning 530004, Guangxi, China
  • Received:2020-03-06 Revised:2020-04-09 Online:2020-12-28 Published:2020-04-28
  • Contact: Zhang Xin-yi,Shen Pei-kang E-mail:zhangxinyi@gxu.edu.cn;pkshen@gxu.edu.cn


With the advantages of high ratio surface area, excellent conductivity and high stability, the stereotaxically-constructed graphene (SCG) material was added to the negative active material (NAM) of lead-acid battery for improving battery performance. XRD, SEM and cyclic voltammetry tests were carried out to analyze the influence of SCG on negative active material. It is found that the conversion efficiency of lead sulfate to lead in the negative active material added with SCG material was higher than that of control group, and the particle size of the lead sulfate obtained after the discharge reaction was smaller, which are favorable factors for inhibiting the irreversible sulfation of the negative active material. At the discharge rate of 0.1 C, the initial discharge capacity of the NAM with SCG added was 173.8 mAh·g -1, being 14% higher than that of the NAM without carbon adding (151.6 mAh·g -1). The cycle life under the high-rate partial-state-of charge (HRPSoC) state reached 10,889 cycles, which was 303% longer than the control one. Finally, for explaining the benefits of SCG materials in lead-acid batteries, possible mechanism is proposed as below: SCG material has a porous structure and excellent conductivity, which allows it to build a conductive network in the NAM and provides an ion channel for the electrolyte, thereby, reducing the ohmic resistance of the negative plate, improving the efficiency of material exchange in chemical reaction as well as the charge acceptance ability of the battery. Furthermore, LSV and EIS tests confirmed that the addition of SCG material would not cause serious hydrogen evolution reaction to the NAM, which can reduce the loss of electrolyte and maintain the stability of the battery. These results verify the positive effect of SCG on lead-acid battery, and show potential application prospect in lead-acid battery.

Key words: stereotaxically-constructed graphene, lead-acid battery, negative active material, irreversible sulfation, cycle life

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