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Article Navigation >  Green Energy&Environment  > 2022  >  7(6): 1206-1216
Luke Hencz, Hao Chen, Zhenzhen Wu, Xingxing Gu, Meng Li, Yuhui Tian, Su Chen, Cheng Yan, Abdulaziz S.R. Bati, Joseph G. Shapter, Milton Kiefel, Dong-Sheng Li, Shanqing Zhang. Poly(thiourea triethylene glycol) as a multifunctional binder for enhanced performance in lithium-sulfur batteries. Green Energy&Environment, 2022, 7(6): 1206-1216. doi: 10.1016/j.gee.2021.01.014
Citation: Luke Hencz, Hao Chen, Zhenzhen Wu, Xingxing Gu, Meng Li, Yuhui Tian, Su Chen, Cheng Yan, Abdulaziz S.R. Bati, Joseph G. Shapter, Milton Kiefel, Dong-Sheng Li, Shanqing Zhang. Poly(thiourea triethylene glycol) as a multifunctional binder for enhanced performance in lithium-sulfur batteries. Green Energy&Environment, 2022, 7(6): 1206-1216. doi: 10.1016/j.gee.2021.01.014
shu

Poly(thiourea triethylene glycol) as a multifunctional binder for enhanced performance in lithium-sulfur batteries

doi: 10.1016/j.gee.2021.01.014

  • a. Centre for Clean Environment and Energy, Griffith University Gold Coast Campus, Southport, QLD, 4222, Australia;

  • b. Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, China;

  • c. School of Mechanical, Medical and Process Engineering, Queensland University of Technology (QUT), Brisbane, QLD, 4000, Australia;

  • d. Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia;

  • e. Institute for Glycomics, Gold Coast Campus, Griffith University, Southport, QLD, 4222, Australia;

  • f. College of Materials and Chemical Engineering, China Three Gorges University, No. 8, Daxue Road, Yichang, 443002, China

Funds:

Luke Hencz would like to thank James Baxter, Darren Holland, and Jack Everson for helping with the polymer synthesis and NMR analysis in this paper. The authors gratefully acknowledge financial support from the Australian Postgraduate Award, Australia Research Council Discovery Projects (DP160102627 and DP1701048343), Shenzhen Peacock Plan of China (KQTD2016112915051055), 111 Project (D20015) of China Three Gorges University, National Natural Science Foundation of China (Grant No. 51902036), and the Natural Science Foundation of Chongqing Science & Technology Commission (Grant No. cstc2019jcyj-msxm1407).

  • Received date 31 October 2020, Accepted date 19 January 2021, RevRecd date 31 December 2020, Publish date 31 December 2022,
    Abstract
  • A mechanically strong binder with polar functional groups could overcome the dilemma of the large volume change during charge/discharge processes and poor cyclability of lithium-sulfur batteries (LSBs). In this work, for the first time, we report the use of poly(thiourea triethylene glycol) (PTTG) as a multifunctional binder for sulfur cathodes to enhance the performance of LSBs. As expected, the PTTG binder facilitates the high performance and stability delivered by the Sulfur-PTTG cathode, including a higher reversible capacity of 825 mAh g-1 at 0.2 C after 80 cycles, a lower capacity fading (0.123% per cycle) over 350 cycles at 0.5 C, a higher areal capacity of 2.5 mAh cm-2 at 0.25 mA cm-2, and better rate capability of 587 mAh g-1 at 2 C. Such superior electrochemical performances could be attributed to PTTG's strong chemical adsorption towards polysulfides which may avoid the lithium polysulfide shuttle effect and excellent mechanical characteristics which prevents electrode collapse during cycling and allows the Sulfur-PTTG electrode to maintain robust electron and ion migration pathways for accelerated redox reaction kinetics.

     

    • • A multifunctional PTTG binder is used to fabricate lithium-sulfur batteries for the first time. • PTTG binder illustrates higher mechanical strength compared to the PVDF binder. • PTTG binder demonstrates an excellent ability to inhibit polysulfides from shuttling via strong chemical adsorption. • The Sulfur-PTTG electrode displays improved electron and ion transportation. • The Sulfur-PTTG cathode delivers improved electrochemical performance and outstanding stability.
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