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<p>Lithium sulphur (Li–S) batteries have gained significant interest because of their high energy density and reasonably priced sulphur. Nevertheless, its practical use is still limited by issues such as short cycle life, polysulfide shuttle, and low conductivity of sulphur. In this work, expectations upon sulphur/carbonized material composite as a cathode would increase the conductivity, cyclic stability, and specific capacitance. In this work, we developed a sulphur-attached graphitic carbon nitride (S/GCN), sulphur-attached carbonized chitosan (S/CCS), sulphur-attached carbonized nanocellulose (S/CNC), and sulphur-attached carbonized sodium alginate (S/CSA) with high sulphur loading electrodes. The electrode structure was endorsed through X-ray diffraction (XRD). The surface texture and elements present in the prepared samples are confirmed through scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The functional group present in prepared samples is confirmed through Fourier-transform infrared spectroscopy (FTIR). The electrochemical behaviors of the S/GCN, S/CCS, S/CNC, and S/CSA electrodes are analysed through electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge/discharge (GCD). Among these four electrodes, the S/GCN electrode shows a high specific capacitance of 454.54 F/g. The fabricated CR2032 coin cell using S/GCN as a cathode exhibited a specific initial discharge capacity of 831.3 mAh/g then the capacity decayed to 423.8 mAh/g after 50 cycles at 1C and showed a capacity retention of 64.9%.</p>

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Sulphur/biomass-derived graphene composite as cathode for improved performance and life cycle of lithium-sulphur batteries

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • M. Manimehalai,
  • K. Siva,
  • T. Theivasanthi,
  • Subash C. B. Gopinath

摘要

Lithium sulphur (Li–S) batteries have gained significant interest because of their high energy density and reasonably priced sulphur. Nevertheless, its practical use is still limited by issues such as short cycle life, polysulfide shuttle, and low conductivity of sulphur. In this work, expectations upon sulphur/carbonized material composite as a cathode would increase the conductivity, cyclic stability, and specific capacitance. In this work, we developed a sulphur-attached graphitic carbon nitride (S/GCN), sulphur-attached carbonized chitosan (S/CCS), sulphur-attached carbonized nanocellulose (S/CNC), and sulphur-attached carbonized sodium alginate (S/CSA) with high sulphur loading electrodes. The electrode structure was endorsed through X-ray diffraction (XRD). The surface texture and elements present in the prepared samples are confirmed through scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The functional group present in prepared samples is confirmed through Fourier-transform infrared spectroscopy (FTIR). The electrochemical behaviors of the S/GCN, S/CCS, S/CNC, and S/CSA electrodes are analysed through electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge/discharge (GCD). Among these four electrodes, the S/GCN electrode shows a high specific capacitance of 454.54 F/g. The fabricated CR2032 coin cell using S/GCN as a cathode exhibited a specific initial discharge capacity of 831.3 mAh/g then the capacity decayed to 423.8 mAh/g after 50 cycles at 1C and showed a capacity retention of 64.9%.