能源化学(英文版) ›› 2019, Vol. 39 ›› Issue (12): 101-108.

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Fe3C-N-doped carbon modified separator for high performance lithium-sulfur batteries

Hongyu Pana,b, Zhong Tana,b, Haihui Zhoua,b, Lanlan Jianga,b, Zhongyuan Huanga,b, Qiaoxia Fenga,b, Qiang Zhoua,b, Shuai Maa,b, Yafei Kuanga,b   

  1. a State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, Hunan, China;
    b College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China
  • 收稿日期:2018-11-13 修回日期:2019-01-18 出版日期:2019-12-15 发布日期:2020-12-18
  • 通讯作者: Haihui Zhou, haihuizh@163.com; Zhongyuan Huang, zhongyuan.222@163.com; Yafei Kuang, yafeik@163.com
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant no. 51672075, 21271069, 51772092, 51704106) and Science and Technology Program of Hunan Province (Grant no. 2015JC3049).

Fe3C-N-doped carbon modified separator for high performance lithium-sulfur batteries

Hongyu Pana,b, Zhong Tana,b, Haihui Zhoua,b, Lanlan Jianga,b, Zhongyuan Huanga,b, Qiaoxia Fenga,b, Qiang Zhoua,b, Shuai Maa,b, Yafei Kuanga,b   

  1. a State Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, Hunan, China;
    b College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, Hunan, China
  • Received:2018-11-13 Revised:2019-01-18 Online:2019-12-15 Published:2020-12-18
  • Contact: Haihui Zhou, haihuizh@163.com; Zhongyuan Huang, zhongyuan.222@163.com; Yafei Kuang, yafeik@163.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant no. 51672075, 21271069, 51772092, 51704106) and Science and Technology Program of Hunan Province (Grant no. 2015JC3049).

摘要: A new Fe3C-N-doped reduced graphene oxide (Fe3C-N-rGO) prepared by a facile method is used as a separator for high performance lithium-sulfur (Li-S) batteries. The Fe3C-N-rGO is coated on the surface of commercial polypropylene separator (Celgard 2400) close to the sulfur cathode. The special nanotubes are in-situ catalyzed by Fe3C nanoparticles. They could entrap lithium polysulfides (LiPSs) to restrain the shuttle effect and reduce the loss of active material. The battery with the modified separator and sulfur cathode shows an excellent cycle performance. It has a high rate performance, 580.5 mAh/g at the high current rate of 4 C relative to 1075 mAh/g at 0.1 C. It also has an initial discharge capacity of 774.8 mAh/g measured at 0.5 C and remains 721.8 mAh/g after 100 cycles with a high capacity retention of 93.2%. The outstanding performances are notable in recently reports with modified separator.

关键词: Fe3C-N-doped reduced graphene oxide, Modified separator, Sulfur cathode, Cyclic and rate performance

Abstract: A new Fe3C-N-doped reduced graphene oxide (Fe3C-N-rGO) prepared by a facile method is used as a separator for high performance lithium-sulfur (Li-S) batteries. The Fe3C-N-rGO is coated on the surface of commercial polypropylene separator (Celgard 2400) close to the sulfur cathode. The special nanotubes are in-situ catalyzed by Fe3C nanoparticles. They could entrap lithium polysulfides (LiPSs) to restrain the shuttle effect and reduce the loss of active material. The battery with the modified separator and sulfur cathode shows an excellent cycle performance. It has a high rate performance, 580.5 mAh/g at the high current rate of 4 C relative to 1075 mAh/g at 0.1 C. It also has an initial discharge capacity of 774.8 mAh/g measured at 0.5 C and remains 721.8 mAh/g after 100 cycles with a high capacity retention of 93.2%. The outstanding performances are notable in recently reports with modified separator.

Key words: Fe3C-N-doped reduced graphene oxide, Modified separator, Sulfur cathode, Cyclic and rate performance