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<p>In this work, the lithium iron phosphate (LiFePO<sub>4</sub>) /multi-walled carbon nanotubes (MWCNTs)/ketjen black (KB)/regenerated cellulose (RC) freestanding composite electrodes were prepared by using 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) /dimethyl sulfoxide (DMSO) as the solvent system for the application of lithium-ion battery cathode. The electrodes were characterized and analyzed by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscope (EIS), and constant-current charge/discharge. The results indicate that the electrodes possess a three-dimensional layered network structure comprising RC and MWCNTs intertwined and lapped. The LiFePO<sub>4</sub> and KB particles can be inlaid and distributed on the surface of the network structure or among the pores, which enhances the multi-directionality and conduction rate of electron conduction, as well as the utilization efficiency of LiFePO<sub>4</sub>. The electrode comprising a 3:1 ratio of MWCNTs to KB and a LiFePO<sub>4</sub> loading of 40 wt% performed best overall, with initial discharge specific capacities of 177.12, 143.02, and 127.12 mAh·g<sup>−1</sup> at rates of 0.1, 2, and 5&#xa0;C, respectively. Moreover, the capacity retention was 99.82% after 50 cycles at 0.1&#xa0;C and 94.58% after 200 cycles at 2&#xa0;C. The Coulombic efficiency remained above 97% during 50 cycles at 0.1&#xa0;C and above 98% during 200 cycles at 2&#xa0;C. The electrodes exhibit favorable electrochemical performance and flexibility, which hopefully match the evolution of electrochemical energy storage devices toward lightweight and flexibility.</p>

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Preparation and characterization of regenerated cellulose-based lithium-ion battery electrodes

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Honghao Wu,
  • Xiwen Wang

摘要

In this work, the lithium iron phosphate (LiFePO4) /multi-walled carbon nanotubes (MWCNTs)/ketjen black (KB)/regenerated cellulose (RC) freestanding composite electrodes were prepared by using 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) /dimethyl sulfoxide (DMSO) as the solvent system for the application of lithium-ion battery cathode. The electrodes were characterized and analyzed by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscope (EIS), and constant-current charge/discharge. The results indicate that the electrodes possess a three-dimensional layered network structure comprising RC and MWCNTs intertwined and lapped. The LiFePO4 and KB particles can be inlaid and distributed on the surface of the network structure or among the pores, which enhances the multi-directionality and conduction rate of electron conduction, as well as the utilization efficiency of LiFePO4. The electrode comprising a 3:1 ratio of MWCNTs to KB and a LiFePO4 loading of 40 wt% performed best overall, with initial discharge specific capacities of 177.12, 143.02, and 127.12 mAh·g−1 at rates of 0.1, 2, and 5 C, respectively. Moreover, the capacity retention was 99.82% after 50 cycles at 0.1 C and 94.58% after 200 cycles at 2 C. The Coulombic efficiency remained above 97% during 50 cycles at 0.1 C and above 98% during 200 cycles at 2 C. The electrodes exhibit favorable electrochemical performance and flexibility, which hopefully match the evolution of electrochemical energy storage devices toward lightweight and flexibility.