能源化学(英文版)

能源化学(英文版) ›› 2020, Vol. 49 ›› Issue (10): 161-165.DOI: 10.1016/j.jechem.2020.01.037

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Facile synthesis of sulfurized polyacrylonitrile composite as cathode for high-rate lithium-sulfur batteries

Jingwei Xiang, Zezhou Guo, Ziqi Yi, Yi Zhang, Lixia Yuan, Zexiao Cheng, Yue Shen, Yunhui Huang   

  1. State Key Laboratory of Material Processing and Die & Mold Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China
  • 收稿日期:2019-11-17 修回日期:2020-01-28 出版日期:2020-10-15 发布日期:2020-12-18
  • 通讯作者: Lixia Yuan
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China(Grant nos.21773077,51632001,and 51532005),the Ministry of Science and Technology "973 program(Grant No.2015CB258400),and the National Key R&D Program of China(2018YFB0905400).The authors acknowledge the Analytical and Testing Center of Huazhong University of Science and Technology(HUST)for field emission TEM and X-ray photoelectron spectrometry(XPS)and the State Key Laboratory of Materials Processing and Die and Mould Technology of HUST for field emission SEM.

Facile synthesis of sulfurized polyacrylonitrile composite as cathode for high-rate lithium-sulfur batteries

Jingwei Xiang, Zezhou Guo, Ziqi Yi, Yi Zhang, Lixia Yuan, Zexiao Cheng, Yue Shen, Yunhui Huang   

  1. State Key Laboratory of Material Processing and Die & Mold Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China
  • Received:2019-11-17 Revised:2020-01-28 Online:2020-10-15 Published:2020-12-18
  • Contact: Lixia Yuan
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(Grant nos.21773077,51632001,and 51532005),the Ministry of Science and Technology "973 program(Grant No.2015CB258400),and the National Key R&D Program of China(2018YFB0905400).The authors acknowledge the Analytical and Testing Center of Huazhong University of Science and Technology(HUST)for field emission TEM and X-ray photoelectron spectrometry(XPS)and the State Key Laboratory of Materials Processing and Die and Mould Technology of HUST for field emission SEM.

摘要： Sulfurized polyacrylonitrile (SPAN) as a promising cathode material for lithium sulfur (Li-S) batteries has drawn increasing attention for its improved electrochemical performance in carbonate-based electrolyte.However,the relatively poor electronic and ionic conductivities of SPAN limit its high-rate and lowtemperature performances.In this work,a novel one-dimensional nanofiber SPAN (SFPAN) composite is developed as the cathode material for Li-S batteries.Benefitting from its one-dimensional nanostructure,the SFPAN composite cathode provides fast channels for the migration of ions and electronics,thus effectively improving its electrochemical performance at high rates and low temperature.As a result,the SFPAN maintains a high reversible specific capacity ~1200 mAh g-1 after 400 cycles at 0.3 A g-1 and can deliver a high capacity of ~850 mAh g-1 even at a high current density of 12.5 A g-1.What is more,the SFPAN can achieve a capacity of ~800 mAh g-1 at 0℃ and ~1550 mAh g-1 at 60℃,thus providing a wider temperature range of applications.This work provides new perspectives on the cathode design for high-rate lithium-sulfur batteries.

关键词: Sulfurized polyacrylonitrile, One-dimensional nanofiber, High-rate peformance, Lithium sulfur batteries

Abstract: Sulfurized polyacrylonitrile (SPAN) as a promising cathode material for lithium sulfur (Li-S) batteries has drawn increasing attention for its improved electrochemical performance in carbonate-based electrolyte.However,the relatively poor electronic and ionic conductivities of SPAN limit its high-rate and lowtemperature performances.In this work,a novel one-dimensional nanofiber SPAN (SFPAN) composite is developed as the cathode material for Li-S batteries.Benefitting from its one-dimensional nanostructure,the SFPAN composite cathode provides fast channels for the migration of ions and electronics,thus effectively improving its electrochemical performance at high rates and low temperature.As a result,the SFPAN maintains a high reversible specific capacity ~1200 mAh g-1 after 400 cycles at 0.3 A g-1 and can deliver a high capacity of ~850 mAh g-1 even at a high current density of 12.5 A g-1.What is more,the SFPAN can achieve a capacity of ~800 mAh g-1 at 0℃ and ~1550 mAh g-1 at 60℃,thus providing a wider temperature range of applications.This work provides new perspectives on the cathode design for high-rate lithium-sulfur batteries.

Key words: Sulfurized polyacrylonitrile, One-dimensional nanofiber, High-rate peformance, Lithium sulfur batteries