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<p>Lithium-sulphur batteries (Li-S) provide a higher capacity and energy density and their commercialization is limited by challenges such as poor cycling stability and rapid capacity degradation. In this study, sulphur/heteroatom-doped reduced graphene oxide/ (S-N, S-r GO) composite material is used to fabricate the cathode for Li-S batteries. Fourier transform infrared spectroscopy, X-ray diffraction, Scanning electron microscopy were used to analyse the materials. Electrochemical behaviour is tested in the workstation through different techniques. The fabricated CR2032 coin cell demonstrated a high voltage of 3.53&#xa0;V and delivered specific capacity of 890.47&#xa0;mA h/g at C/5 with a minimal polarization. The capacity is retained up to 74.96% for more than 50 cycles, while coulombic efficiency of 85.42%, suggesting incomplete charge transfer. These results highlight that S-N, S-r GO is more suitable to make the cathode for Li-S batteries, with further optimization required to enhance long-term stability and overall performance.</p>

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Heteroatom-doped reduced graphene oxide/sulphur composite cathode for lithium sulphur batteries with high-specific capacity and power density

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • K. Siva,
  • S.R. Srikumar,
  • T. Theivasanthi,
  • Subash C.B. Gopinath

摘要

Lithium-sulphur batteries (Li-S) provide a higher capacity and energy density and their commercialization is limited by challenges such as poor cycling stability and rapid capacity degradation. In this study, sulphur/heteroatom-doped reduced graphene oxide/ (S-N, S-r GO) composite material is used to fabricate the cathode for Li-S batteries. Fourier transform infrared spectroscopy, X-ray diffraction, Scanning electron microscopy were used to analyse the materials. Electrochemical behaviour is tested in the workstation through different techniques. The fabricated CR2032 coin cell demonstrated a high voltage of 3.53 V and delivered specific capacity of 890.47 mA h/g at C/5 with a minimal polarization. The capacity is retained up to 74.96% for more than 50 cycles, while coulombic efficiency of 85.42%, suggesting incomplete charge transfer. These results highlight that S-N, S-r GO is more suitable to make the cathode for Li-S batteries, with further optimization required to enhance long-term stability and overall performance.