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Diphenyl guanidine vulcanization accelerators enable sulfurized polyacrylonitrile cathode for high capacity and ether-compatible by fast kinetic

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  • Wang, Yu
  • Zhang, Yunpeng
  • Shuai, Yi
  • Chen, Kanghua

Abstract

Sulfurized polyacrylonitrile (SPAN) cathode shows excellent electrochemical performance in carbonate electrolyte for lithium-sulfur batteries. However, the limited redox conversion rate of SPAN cathode in ether electrolyte would lead to high solubility of the intermediate polysulfide Li2Sn(n ≤ 4) and shuttling, resulting in a low performance of corresponding lithium-sulfur battery, even though ether-based electrolytes are more suitable in terms of Li metal anode. In addition, SPAN is comparatively lower sulfur loading (<50 wt%) reduced its value. Improving the sulfur loading and accelerate the redox conversion of SPAN to be compatible with ether electrolyte will be one of the most promising cathode of lithium-sulfur batteries. Here, we introduced a sulfurized polyacrylonitrile cathode (SPAN-DG) with high sulfur loading (52 wt%) and high conductivity prepared by diphenylguanidine as vulcanization accelerator into lithium-sulfur battery based on ether electrolyte. This study found that SPAN-DG cathode with high conductivity can fast reaction kinetics and successfully inhibit the dissolution of lithium polysulfide and shuttle in ether electrolytes, shows good electrochemical performance. SPAN-DG cathode deliver a specific capacity of 879 mAh g−1 and 661 mAh g−1 (based on the mass of cathode) at rates of 0.1C and 1C (1C = 700 mA g−1), respectively.

Suggested Citation

  • Wang, Yu & Zhang, Yunpeng & Shuai, Yi & Chen, Kanghua, 2021. "Diphenyl guanidine vulcanization accelerators enable sulfurized polyacrylonitrile cathode for high capacity and ether-compatible by fast kinetic," Energy, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:energy:v:233:y:2021:i:c:s0360544221014080
    DOI: 10.1016/j.energy.2021.121160
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    References listed on IDEAS

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    1. Sheng S. Zhang, 2014. "Understanding of Sulfurized Polyacrylonitrile for Superior Performance Lithium/Sulfur Battery," Energies, MDPI, vol. 7(7), pages 1-13, July.
    2. Xin Chen & Linfeng Peng & Lihui Wang & Jiaqiang Yang & Zhangxiang Hao & Jingwei Xiang & Kai Yuan & Yunhui Huang & Bin Shan & Lixia Yuan & Jia Xie, 2019. "Ether-compatible sulfurized polyacrylonitrile cathode with excellent performance enabled by fast kinetics via selenium doping," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
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