Morphology regulation of Li2O2 by flower-like ZnCo2S4 enabling high performance Li-O2 battery

Authors

Zhiqian Hou, Chengdu University of Technology
Shan Feng, Chengdu University of Technology
Peng Hei, Chengdu University of Technology
Tingshuai Yang, Chengdu University of Technology
Zhiqun Ran, Chengdu University of Technology
Ruixin Zheng, Chengdu University of Technology
Xin Liao, Chengdu University of Technology
Shu Chaozhu, University of Wollongong, Chengdu University of Technology
Long Jianping, Chengdu University of Technology

RIS ID

139108

Publication Details

Hou, Z., Feng, S., Hei, P., Yang, T., Ran, Z., Zheng, R., Liao, X., Chaozhu, S. & Jianping, L. (2019). Morphology regulation of Li2O2 by flower-like ZnCo2S4 enabling high performance Li-O2 battery. Journal of Power Sources, 441 227168-1-227168-10.

Abstract

The development of high-efficiency oxygen electrode with well structural and chemical stability is critical to boost the rapid development of lithium-oxygen (Li-O2) batteries. Which are reckoned as a potent contender for next-generation energy storage devices due to their ultra-high theoretical energy density. Here, a flower-like three-dimensional self-standing ZnCo2S4-based electrode without an addition of binders are fabricated and employing as positive electrode for Li-O2 batteries. The bifunctional catalytic activity of flower-like ZnCo2S4 is conducive to improving the hysteresis kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Representative ultrathin petal edge exposes adequate active sites and provides a sufficient contact interface between Li2O2 and positive electrode, which are essential for reducing the charge overpotential during OER. Compared with the control electrodes, the flower-like ZnCo2S4@Ni-based Li-O2 battery shows decreased overpotential (0.78 V) and improved cycle stability (over 500 cycles).