能源化学(英文版) ›› 2020, Vol. 48 ›› Issue (9): 390-397.DOI: 10.1016/j.jechem.2020.02.028

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Oxygen-deficient titanium dioxide supported cobalt nano-dots as efficient cathode material for lithium-sulfur batteries

You Lia, Xiao Zhanga, Guihua Liua, Ashton Gerhardtb, Katelyn Evansb, Aizhong Jiaa, Zisheng Zhanga,b   

  1. a 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;
    b Department of Chemical and Biological Engineering.University of Ottawa.Ottawa.Ontario K1N 6N5.Canada
  • 收稿日期:2020-01-05 修回日期:2020-02-12 出版日期:2020-09-15 发布日期:2020-12-18
  • 通讯作者: Guihua Liu, Aizhong Jia, Zisheng Zhang
  • 基金资助:
    The authors gratefully acknowledge the support from the National Natural Science Foundation of China (21978063);the "Excellent Going Abroad Experts" Training Program in Hebei Province,and Innovation Fund for Excellent Youth of Hebei University of Technology (2012002).

Oxygen-deficient titanium dioxide supported cobalt nano-dots as efficient cathode material for lithium-sulfur batteries

You Lia, Xiao Zhanga, Guihua Liua, Ashton Gerhardtb, Katelyn Evansb, Aizhong Jiaa, Zisheng Zhanga,b   

  1. a 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;
    b Department of Chemical and Biological Engineering.University of Ottawa.Ottawa.Ontario K1N 6N5.Canada
  • Received:2020-01-05 Revised:2020-02-12 Online:2020-09-15 Published:2020-12-18
  • Contact: Guihua Liu, Aizhong Jia, Zisheng Zhang
  • Supported by:
    The authors gratefully acknowledge the support from the National Natural Science Foundation of China (21978063);the "Excellent Going Abroad Experts" Training Program in Hebei Province,and Innovation Fund for Excellent Youth of Hebei University of Technology (2012002).

摘要: Lithium sulfur (Li-S) batteries demonstrate great promise for efficient energy storage systems once the lithium polysulfide (LPS) shuttling and sluggish redox kinetics can be well addressed.Herein.we developed a sea urchin-structured oxygen-deficient titanium dioxide semiconductor anchored with cobalt nano-dots (Co@TiO2-x) as a high-performance multifunctional sulfur host material for Li-S batteries.The sea urchin-structured Co@TiO2-x offers strong structural stability and strengthened chemical interaction towards LPS.Meanwhile.the incorporation of Co nano-dots into TiO2 leads to increased oxygen vacancies.which augments the electrical conduction and benefits LPS conversion acceleration as well.As a result.the oxygen vacancy-rich Co@TiO2-x composite exhibits excellent conductivity.strong LPS confinement and promoted sulfur electrochemical kinetics.rendering enhanced LPS shuttling inhibition and rapid redox reaction.Attributed to these features.the Co@TiO2-x/S cathode exhibits a discharge capacity of 803 mAh g-1 at 1 C and a good cyclic stability upon 500 cycles with a low capacity fading rate of 0.07% per cycle.This synergistic design of conductive multifunctional LPS barrier is also promising to enlighten the material engineering in other energy storage applications.

关键词: Titanium dioxide, Oxygen vacancy, Cobalt nano-dots, Lithium-sulfur battery, Conversion kinetics

Abstract: Lithium sulfur (Li-S) batteries demonstrate great promise for efficient energy storage systems once the lithium polysulfide (LPS) shuttling and sluggish redox kinetics can be well addressed.Herein.we developed a sea urchin-structured oxygen-deficient titanium dioxide semiconductor anchored with cobalt nano-dots (Co@TiO2-x) as a high-performance multifunctional sulfur host material for Li-S batteries.The sea urchin-structured Co@TiO2-x offers strong structural stability and strengthened chemical interaction towards LPS.Meanwhile.the incorporation of Co nano-dots into TiO2 leads to increased oxygen vacancies.which augments the electrical conduction and benefits LPS conversion acceleration as well.As a result.the oxygen vacancy-rich Co@TiO2-x composite exhibits excellent conductivity.strong LPS confinement and promoted sulfur electrochemical kinetics.rendering enhanced LPS shuttling inhibition and rapid redox reaction.Attributed to these features.the Co@TiO2-x/S cathode exhibits a discharge capacity of 803 mAh g-1 at 1 C and a good cyclic stability upon 500 cycles with a low capacity fading rate of 0.07% per cycle.This synergistic design of conductive multifunctional LPS barrier is also promising to enlighten the material engineering in other energy storage applications.

Key words: Titanium dioxide, Oxygen vacancy, Cobalt nano-dots, Lithium-sulfur battery, Conversion kinetics