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-2at 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.

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

Centre for Clean Environment and Energy,Griffith University Gold Coast Campus,Southport,QLD,4222,Australia;Chongqing Key Laboratory of Catalysis and New Environmental Materials,College of Environment and Resources,Chongqing Technology and Business University,Chongqing,400067,China;School of Mechanical,Medical and Process Engineering,Queensland University of Technology(QUT),Brisbane,QLD,4000,Australia;Australian Institute for Bioengineering and Nanotechnology(AIBN),The University of Queensland,St.Lucia,Brisbane,QLD,4072,Australia;Institute for Glycomics,Gold Coast Campus,Griffith University,Southport,QLD,4222,Australia;College of Materials and Chemical Engineering,China Three Gorges University,No.8,Daxue Road,Yichang,443002,China

绿色能源与环境（英文）

[1]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)[J].绿色能源与环境（英文）,2022(06):1206-1216

triethylene

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