J. Mater. Sci. Technol. ›› 2022, Vol. 113: 207-216.DOI: 10.1016/j.jmst.2021.10.027

• Research article • Previous Articles     Next Articles

Inhibited shuttle effect by functional separator for room-temperature sodium-sulfur batteries

Chunwei Donga, Hongyu Zhoua, Hui Liua, Bo Jina,*(), Zi Wena,*(), Xingyou Langa, Jianchen Lia, Jaekwang Kimb,*(), Qing Jianga,*()   

  1. aKey Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China
    bDepartment of Energy Convergence Engineering, Cheongju University, 298 Daeseong-ro, Cheongwon-gu, Cheongju, Chungbuk, 363-764, Korea
  • Received:2021-08-02 Revised:2021-10-04 Accepted:2021-10-06 Published:2022-01-06 Online:2022-06-24
  • Contact: Bo Jin,Zi Wen,Jaekwang Kim,Qing Jiang
  • About author:jiangq@jlu.edu.cn (Q. Jiang).
    jaekwang@cju.ac.kr (J. Kim),
    wenzi@jlu.edu.cn (Z. Wen),
    *E-mail addresses: jinbo@jlu.edu.cn (B. Jin),
    First author contact:

    1 These authors contributed equally to this work.

Abstract:

According to a statistic, approximately 6 trillion cigarettes are smoked each year all over the world, which produces approximately 1.2 million tons of discarded cigarette butts. The discarded cigarette filters are non-biodegradable, thus they produce a mass of waste disposal and cause environmental pollution issue. For the purpose of transforming waste into wealth and reducing environmental pollution, nitrogen and sulfur co-doped carbon nanofiber/carbon black (N,S-CNF/CB) composite derived from the discarded cigarette filters is employed to modify glass fiber (GF) separator for the first time in this study. N,S-CNF improves binding ability towards sodium polysulfides (SPSs) by chemisorption. Non-polar CB limits the dissolution of SPSs in the liquid electrolyte by physisorption. The experiment and density functional theory calculation results indicate that a RT-Na/S battery with a N,S-CNF/CB+GF separator exhibits good cycling stability and rate performance. After 100 cycles at a low current rate of 0.1 C, a RT-Na/S battery with a sulfur mass fraction of 71% delivers a discharge capacity of 703 mAh g- 1. In addition, at a high current rate of 0.5 C, a discharge capacity of 527 mAh g- 1 is still maintained after 900 cycles with a very low capacity fading rate of 0.035% per cycle.

Key words: Shuttle effect, Density functional theory, Functional separator, Nitrogen and sulfur co-doping, Room-temperature sodium-sulfur batteries