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<p>Lithium-ion capacitors (LICs) are widely recognized as highly promising energy storage devices owing to their exceptional energy density and high-power output. However, the anode materials typically exhibit slow ion diffusion and limited electron transport, which severely restrict their electrochemical performance and hinder widespread practical applications. Herein, TiO<sub>2</sub> nanomaterials decorated porous hollow carbon microtubes (TiO<sub>2</sub>/C) composite is prepared by the coaxial electrospinning of PMMA/PAN-Ti<sub>3</sub>C<sub>2</sub> and the two-step heat treatments. The as-prepared TiO<sub>2</sub>/C composite exhibits impressive electrochemical performance, delivering a high specific capacity of 363&#xa0;mAh&#xa0;g<sup>−1</sup> at a current density of 0.1&#xa0;A&#xa0;g<sup>−1</sup> with a Coulombic efficiency of 97.1%. It also demonstrates excellent rate capability, retaining 191.6&#xa0;mAh&#xa0;g<sup>−1</sup> at 1&#xa0;A&#xa0;g<sup>−1</sup>, along with remarkable cycling stability. When assembled into an AC//TiO<sub>2</sub>/C lithium-ion capacitor (LIC), the device achieves a maximum energy density of 106.7&#xa0;Wh&#xa0;kg<sup>−1</sup> and a peak power density of 7&#xa0;kW&#xa0;kg<sup>−1</sup>. Furthermore, it shows good long-term stability, maintaining a capacitance retention of 80.65% after 1000 cycles at 1&#xa0;A&#xa0;g<sup>−1</sup>.</p>

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Electrospun PMMA/PAN-MXene-derived hollow TiO2/C composites as anode materials for advanced hybrid lithium-ion capacitors

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Hai Liu,
  • Shuo Gao,
  • Cuihua An,
  • Liyang Lin,
  • Ning Hu

摘要

Lithium-ion capacitors (LICs) are widely recognized as highly promising energy storage devices owing to their exceptional energy density and high-power output. However, the anode materials typically exhibit slow ion diffusion and limited electron transport, which severely restrict their electrochemical performance and hinder widespread practical applications. Herein, TiO2 nanomaterials decorated porous hollow carbon microtubes (TiO2/C) composite is prepared by the coaxial electrospinning of PMMA/PAN-Ti3C2 and the two-step heat treatments. The as-prepared TiO2/C composite exhibits impressive electrochemical performance, delivering a high specific capacity of 363 mAh g−1 at a current density of 0.1 A g−1 with a Coulombic efficiency of 97.1%. It also demonstrates excellent rate capability, retaining 191.6 mAh g−1 at 1 A g−1, along with remarkable cycling stability. When assembled into an AC//TiO2/C lithium-ion capacitor (LIC), the device achieves a maximum energy density of 106.7 Wh kg−1 and a peak power density of 7 kW kg−1. Furthermore, it shows good long-term stability, maintaining a capacitance retention of 80.65% after 1000 cycles at 1 A g−1.