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<p>This study has prepared the Na<sub>0.44</sub>MnO<sub>2</sub>/VGCF/CNT (denoted as NMOVC, vapor grown carbon fiber denoted as VGCF, carbon nanotube denoted as CNT) cathode composite materials for aqueous sodium-ion batteries through a combination of mechanical milling, high-temperature calcination, and incorporation of conductive carbon materials. The morphology and electrochemical performance of the materials have been analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and other electrochemical tests. The phase and microstructure analysis of the NMOVC cathode composite materials reveals that their particles exhibit a polygonal rod-shaped morphology. These materials are primarily composed of Na, O, Mn elements, VGCF, and CNT, with the carbon materials forming an effective conductive network. The electrochemical performance tests of the NMOVC cathode material, prepared into thick-film electrodes using the dry film technique, showed that it has been discovered that the NMOVC cathode composite materials not only exhibit good cycling stability but also have excellent rate performance. At a rate of 0.1 C, the initial discharge capacity of the materials is 116.83 mAh/g, representing a 15.77% increase in capacity utilization compared to the non-carbon composite Na<sub>0.44</sub>MnO<sub>2</sub> (denoted as NMO). After 130 cycles of charge and discharge, the reversible discharge capacity retention rate is 99%, which is 10% higher than that of the non-carbon composite NMO. At a 1 C rate, the NMOVC‖NaOH‖AC aqueous sodium-ion single cell battery, assembled with activated carbon (denoted as AC), shows an initial discharge capacity of 1.22 Ah. After 2000 cycles, the reversible discharge capacity retention rate reaches 87.7%, demonstrating that the NMOVC‖NaOH‖AC aqueous sodium-ion full cell system has good long-term cycling stability. These findings provide a theoretical basis for the application of NMOVC cathode composite materials in environmentally friendly aqueous sodium-ion energy storage batteries.</p>

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Preparation and electrochemical performance study of NMOVC cathode composite materials for aqueous sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Bo Ding,
  • Cui-Ping Li,
  • Jun Tang,
  • Jia-Jun Fan,
  • Xing-Shi Fan,
  • Yang-Zhou Ma

摘要

This study has prepared the Na0.44MnO2/VGCF/CNT (denoted as NMOVC, vapor grown carbon fiber denoted as VGCF, carbon nanotube denoted as CNT) cathode composite materials for aqueous sodium-ion batteries through a combination of mechanical milling, high-temperature calcination, and incorporation of conductive carbon materials. The morphology and electrochemical performance of the materials have been analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and other electrochemical tests. The phase and microstructure analysis of the NMOVC cathode composite materials reveals that their particles exhibit a polygonal rod-shaped morphology. These materials are primarily composed of Na, O, Mn elements, VGCF, and CNT, with the carbon materials forming an effective conductive network. The electrochemical performance tests of the NMOVC cathode material, prepared into thick-film electrodes using the dry film technique, showed that it has been discovered that the NMOVC cathode composite materials not only exhibit good cycling stability but also have excellent rate performance. At a rate of 0.1 C, the initial discharge capacity of the materials is 116.83 mAh/g, representing a 15.77% increase in capacity utilization compared to the non-carbon composite Na0.44MnO2 (denoted as NMO). After 130 cycles of charge and discharge, the reversible discharge capacity retention rate is 99%, which is 10% higher than that of the non-carbon composite NMO. At a 1 C rate, the NMOVC‖NaOH‖AC aqueous sodium-ion single cell battery, assembled with activated carbon (denoted as AC), shows an initial discharge capacity of 1.22 Ah. After 2000 cycles, the reversible discharge capacity retention rate reaches 87.7%, demonstrating that the NMOVC‖NaOH‖AC aqueous sodium-ion full cell system has good long-term cycling stability. These findings provide a theoretical basis for the application of NMOVC cathode composite materials in environmentally friendly aqueous sodium-ion energy storage batteries.