Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 505-514.DOI: 10.1016/j.jechem.2022.12.050

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Isolated diatomic Zn-Co metal-nitrogen/oxygen sites with synergistic effect on fast catalytic kinetics of sulfur species in Li-S battery

Chun-Lei Songa, Qiao-Tong Hea, Zhongyi Zengb, Jing-Yan Chena, Tian Wena, Yu-Xiao Huanga, Liu-Chun Zhuanga, Wei Yib,*, Yue-Peng Caia,*, Xu-Jia Hongb,*   

  1. aSchool of Chemistry, South China Normal University, Guangzhou 510006, Guangdong, China;
    bGuangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target & Clinical Pharmacology, the NMPA and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences & the Fifth Affiliated Hospital Guangzhou Medical University, Guangzhou 511436, Guangdong, China
  • Received:2022-11-15 Revised:2022-12-20 Accepted:2022-12-28 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: yiwei@gzhmu.edu.cn (W. Yi), caiyp@scnu.edu.cn (Y.-P. Cai), hongxujia@gzhmu.edu.cn (X.-J. Hong).

Abstract: Lithium-sulfur batteries are severely restricted by low electronic conductivity of sulfur and Li2S, shuttle effect, and slow conversion reaction of lithium polysulfides (LiPSs). Herein, we report a facile and high-yield strategy for synthesizing dual-core single-atom catalyst (ZnCoN4O2/CN) with atomically dispersed nitrogen/oxygen-coordinated Zn-Co sites on carbon nanosheets. Based on density functional theory (DFT) calculations and LiPSs conversion catalytic ability, ZnCoN4O2/CN provides dual-atom sites of Zn and Co, which could facilitate Li+ transport and Li2S diffusion, and catalyze LiPSs conversion more effectively than homonuclear bimetallic single-atom catalysts or their simple mixture and previously reported single-atom catalysts. Li-S cell with ZnCoN4O2/CN modified separator showed excellent rate performance (789.4 mA h g-1 at 5 C) and stable long cycle performance (0.05% capacity decay rate at 6C with 1000 cycles, outperforming currently reported single atomic catalysts for LiPSs conversion. This work high-lights the important role of metal active centers and provides a strategy for producing multifunctional dual-core single atom catalysts for high-performance Li-S cells.

Key words: Dual-core single-atom catalysts, Lithium polysulfides, Fast catalytic kinetics, Li2S diffusion, Li-S battery