SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 67 ›› Issue (3): 58-67.DOI: 10.1016/j.cjche.2023.11.022

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Tungsten oxide/nitrogen-doped carbon nanotubes composite catalysts for enhanced redox kinetics in lithium-sulfur batteries

Deqing He1, Zihao Xie1, Qian Yang1, Wei Wang2, Chao Su1   

  1. 1 School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
    2 State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
  • 收稿日期:2023-05-04 修回日期:2023-11-05 出版日期:2024-03-28 发布日期:2024-06-01
  • 通讯作者: Chao Su,E-mail address:chao.su@just.edu.cn.
  • 基金资助:
    This work is supported by the Open Project Program of the State Key Laboratory of Materials-Oriented Chemical Engineering (KL21-05). The authors acknowledge the support of the Instrumental Analysis Center, Jiangsu University of Science and Technology.

Tungsten oxide/nitrogen-doped carbon nanotubes composite catalysts for enhanced redox kinetics in lithium-sulfur batteries

Deqing He1, Zihao Xie1, Qian Yang1, Wei Wang2, Chao Su1   

  1. 1 School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
    2 State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
  • Received:2023-05-04 Revised:2023-11-05 Online:2024-03-28 Published:2024-06-01
  • Contact: Chao Su,E-mail address:chao.su@just.edu.cn.
  • Supported by:
    This work is supported by the Open Project Program of the State Key Laboratory of Materials-Oriented Chemical Engineering (KL21-05). The authors acknowledge the support of the Instrumental Analysis Center, Jiangsu University of Science and Technology.

摘要: The sluggish redox kinetics of polysulfides in lithiumesulfur (LieS) batteries are a significant obstacle to their widespread adoption as energy storage devices. However, recent studies have shown that tungsten oxide (WO3) can facilitate the conversion kinetics of polysulfides in LieS batteries. Herein, we fabricated host materials for sulfur using nitrogen-doped carbon nanotubes (N-CNTs) and WO3. We used low-cost components and simple procedures to overcome the poor electrical conductivity that is a disadvantage of metal oxides. The composites of WO3 and N-CNTs (WO3/N-CNTs) create a stable framework structure, fast ion diffusion channels, and a 3D electron transport network during electrochemical reaction processes. As a result, the WO3/N-CNT-Li2S6 cathode demonstrates high initial capacity (1162 mA·h·g-1 at≥0.5 C), excellent rate performance (618 mA·h·g-1 at 5.5 C), and a low capacity decay rate (0.093% up to 600 cycles at 2 C). This work presents a novel approach for preparing tungsten oxide/carbon composite catalysts that facilitate the redox kinetics of polysulfide conversion.

关键词: Li-S batteries, Composites, Ion diffusion channels, 3D electron transport network, Redox kinetics

Abstract: The sluggish redox kinetics of polysulfides in lithiumesulfur (LieS) batteries are a significant obstacle to their widespread adoption as energy storage devices. However, recent studies have shown that tungsten oxide (WO3) can facilitate the conversion kinetics of polysulfides in LieS batteries. Herein, we fabricated host materials for sulfur using nitrogen-doped carbon nanotubes (N-CNTs) and WO3. We used low-cost components and simple procedures to overcome the poor electrical conductivity that is a disadvantage of metal oxides. The composites of WO3 and N-CNTs (WO3/N-CNTs) create a stable framework structure, fast ion diffusion channels, and a 3D electron transport network during electrochemical reaction processes. As a result, the WO3/N-CNT-Li2S6 cathode demonstrates high initial capacity (1162 mA·h·g-1 at≥0.5 C), excellent rate performance (618 mA·h·g-1 at 5.5 C), and a low capacity decay rate (0.093% up to 600 cycles at 2 C). This work presents a novel approach for preparing tungsten oxide/carbon composite catalysts that facilitate the redox kinetics of polysulfide conversion.

Key words: Li-S batteries, Composites, Ion diffusion channels, 3D electron transport network, Redox kinetics