Effects of nano-SiO2 doped PbO2 as the positive electrode on the performance of lead-carbon hybrid capacitor

Jinpeng Bao; Nan Lin; Jiaxiang Guo; Weiqi Gao; Zhiqiang Liu; Haibo Lin

doi:10.1016/j.jcis.2020.03.082

Effects of nano-SiO₂ doped PbO₂ as the positive electrode on the performance of lead-carbon hybrid capacitor

J Colloid Interface Sci. 2020 Aug 15:574:377-384. doi: 10.1016/j.jcis.2020.03.082. Epub 2020 Mar 23.

Authors

Jinpeng Bao¹, Nan Lin², Jiaxiang Guo¹, Weiqi Gao¹, Zhiqiang Liu¹, Haibo Lin³

Affiliations

¹ State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, People's Republic of China.
² Institute of Energy and Process Systems Engineering, Technische Universit€at Braunschweig, Franz-Liszt-Str. 35, Braunschweig, Germany.
³ State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, People's Republic of China; Zhuhai College of Jilin University, Zhuhai 519041, China. Electronic address: lhb910@jlu.edu.cn.

PMID: 32339820
DOI: 10.1016/j.jcis.2020.03.082

Abstract

The PbO₂ electrodes of lead-acid batteries are normally applied as the positive electrodes in lead-carbon hybrid capacitors. However, the effective utilization rate of active materials in the electrodes is only about 12.5%, leading to a low energy density of lead-carbon hybrid capacitors. In this paper, a nano-SiO₂ doped PbO₂ electrode was prepared by the co-electrodeposition method. The energy density of the lead-carbon hybrid capacitor using a nano-SiO₂/PbO₂ electrode can reach 61 Wh kg^-1 at 3 A g^-1. The results show that the inert nano-SiO₂ can establish electrolyte diffusion channels in the positive electrode, and thus improve the effective utilization rate of active materials. This work provides a new idea for the design and development of the positive materials for high-performance lead-carbon hybrid capacitors.

Keywords: Effective utilization rate of active materials; Lead-carbon hybrid capacitor; Nano-SiO(2); PbO(2) electrode.