首页> 中文期刊> 《能源化学:英文版》 >Rational design of Co nano-dots embedded three-dimensional graphene gel as multifunctional sulfur cathode for fast sulfur conversion kinetics

Rational design of Co nano-dots embedded three-dimensional graphene gel as multifunctional sulfur cathode for fast sulfur conversion kinetics

         

摘要

Lithium-sulfur(Li-S)batteries hold great promises to serve as next-generation energy storage devices because of their high theoretical energy density and environmental benignity.However,the shuttle effect of the soluble lithium polysulfides(LiPS)and intrinsic insulating nature of sulfur lead to low sulfur utilization and coulombic efficiency,leading to poor cycling performance.The impeded charge transportation and retard LiPS catalytic conversion also endows the Li-S batteries with sluggish redox reaction,leading to unsatisfied rate capability.In this study,Co-based MOF material ZIF-67 is used as the precursor to prepare Co nano-dots decorated three-dimensional graphene aerogel as sulfur immobilizer.This porous architecture establishes a highly conductive interconnected framework for fast charge/mass transportation.The exposed Co nano-dots serve as active sites to strongly trap LiPS,which endows CoNDs@G with low decomposition energy barrier for fast LiPS conversion reaction and promote the completely Li2 S catalytic transformation.Li-S cells based on the Co-NDs@G cathode exhibits excellent cyclability and a high capacity retention rate of 91.1%in 100 cycles.This strategy offers a new direction to design sulfur immobilizer for accelerated LiPS conversion kinetics of Li-S batteries.

著录项

  • 来源
    《能源化学:英文版》 |2021年第5期|P.132-140|共9页
  • 作者单位

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China;

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China;

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China;

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China;

    College of Chemical Technology Shijiazhuang University Shijiazhuang 050035 Hebei China;

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China;

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 ChinaDepartment of Chemical and Biological Engineering University of Ottawa Ottawa KIN 6N5 ON Canada;

    Hebei Provincial Key Laboratory of Green Chemical Technology and High Efficient Energy Saving Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and Technology Hebei University of Technology Tianjin 300130 China;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 物理化学(理论化学)、化学物理学;
  • 关键词

    Lithium-sulfur batteries; Co nano-dots; Graphene network; Metal-organic framework; High-loading cathodes;

    机译:锂 - 硫磺电池;CO纳米点;石墨烯网络;金属有机框架;高装载阴极;
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