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<p>This study employs a hydrothermal approach to synthesize bismuth sulfide (Bi₂S₃) 3D nanoflowers, which consists of primary nanorods. A composite material comprising sulfur, mechanochemically processed graphene (MCG), and Bi₂S₃ (3D) nanoflowers (S/MCG/Bi₂S₃ (3D)) is investigated as a cathode for lithium-sulfur (Li-S) batteries. The composite and its constituents are characterized using various techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-rays spectroscopy (EDAX). The electrochemical properties of Bi₂S₃ (3D) nanoflowers, MCG, and the S/MCG/Bi₂S₃ (3D) composite are assessed through cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The S/MCG/Bi₂S₃ (3D) composite demonstrated an outstanding specific capacitance of 646.41&#xa0;F/g, retaining 99.61% of its capacity even after 1000 cycles. When used as a cathode in a coin cell, it delivered an approximate voltage of 3.44&#xa0;V. Additionally, the coin cell maintained a stable potential of 3.02&#xa0;V while continuously powering a yellow-emitting LED for 2&#xa0;h.</p>

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Sulphur/mechanochemical graphene/Bi2S3 as a 3D-nanoflowers composite cathode for high-performance lithium-sulfur coin-cell

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月29日

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  • Siva Kannan,
  • Manimehalai Muthumurugan,
  • Subbiah Ramachandran Srikumar,
  • Theivasanthi Thirugnanasambandan,
  • Subash C.B. Gopinath

摘要

This study employs a hydrothermal approach to synthesize bismuth sulfide (Bi₂S₃) 3D nanoflowers, which consists of primary nanorods. A composite material comprising sulfur, mechanochemically processed graphene (MCG), and Bi₂S₃ (3D) nanoflowers (S/MCG/Bi₂S₃ (3D)) is investigated as a cathode for lithium-sulfur (Li-S) batteries. The composite and its constituents are characterized using various techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-rays spectroscopy (EDAX). The electrochemical properties of Bi₂S₃ (3D) nanoflowers, MCG, and the S/MCG/Bi₂S₃ (3D) composite are assessed through cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS). The S/MCG/Bi₂S₃ (3D) composite demonstrated an outstanding specific capacitance of 646.41 F/g, retaining 99.61% of its capacity even after 1000 cycles. When used as a cathode in a coin cell, it delivered an approximate voltage of 3.44 V. Additionally, the coin cell maintained a stable potential of 3.02 V while continuously powering a yellow-emitting LED for 2 h.