Double catalysis of Co9Se8-Ni3Se4 heterogeneous dual-chamber core-shell Achieves high conversion of polysulfides

Chunman Yang; Fei Wang; Yongqi Wang; Wenchang Han; Wengxiang Ai; Qian Wang; Yuhan He; Ziyi Zhu; Yiyong Zhang; Xue Li

doi:10.1016/j.jcis.2024.12.010

Double catalysis of Co₉Se₈-Ni₃Se₄ heterogeneous dual-chamber core-shell Achieves high conversion of polysulfides

J Colloid Interface Sci. 2024 Dec 6:682:1164-1174. doi: 10.1016/j.jcis.2024.12.010. Online ahead of print.

Authors

Chunman Yang¹, Fei Wang², Yongqi Wang¹, Wenchang Han¹, Wengxiang Ai¹, Qian Wang¹, Yuhan He¹, Ziyi Zhu¹, Yiyong Zhang³, Xue Li⁴

Affiliations

¹ National Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Batteries Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
² State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
³ National Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Batteries Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China. Electronic address: zhangyiyong2018@kust.edu.cn.
⁴ National Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Batteries Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China. Electronic address: Lixue@kust.edu.cn.

PMID: 39671950
DOI: 10.1016/j.jcis.2024.12.010

Abstract

Achieving efficient catalytic conversion of lithium polysulfides is a key way to improve kinetics in lithium-sulfur (Li-S) batteries. However, due to the limited nature of the catalyst interface, it is difficult to achieve a high conversion rate of LiPSs in one step. A novel heterogeneous dual-chamber core-shell nanocatalyst (Co₉Se₈-Ni₃Se₄@PC) is described here, which efficiently accommodates sulfur and provides a heterogeneous dual catalytic interface like a two-stage "filter". The dual guarantee provides a rapid and high-ratio catalytic conversion of LiPSs. Through in-situ Raman experiments and theoretical analysis, it has been proved that the dual-chamber multi-stage catalytic structure can promote the efficient conversion of LiPSs and good sulfur species reversibility. The Co₉Se₈-Ni₃Se₄@PC cathode provides an initial specific capacity of 923mAh/g at 2C, and the average capacity decay rate after 800 cycles is only 0.048 %. This work provides new ideas for designing new nanocatalysts in lithium-sulfur systems and insights into achieving multi-stage catalysis in structural design.

Keywords: Co(9)Se(8)-Ni(3)Se(4)@PC host; Dual-chambered shell; Lithium-sulfur battery; Two-stage catalysis.