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<p>The rapid advancement of wearable electronic devices demands high-performance sodium-ion battery (SIB) cathode materials, particularly in terms of stability and electrochemical performance. Sodium super ionic conductor (NASICON)-type Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> (NVP) has attracted significant attention due to its unique framework structure and high theoretical capacity. However, the inherently low electrical conductivity of NVP limits large-scale application. To address this issue, a novel NVP@C-rGO composite was synthesized using metal–organic frameworks (MOF) and reduced graphene oxide (rGO). The structures of these two forms of carbon enhance the charge transfer kinetics of NVP and provide two stress-buffering layers, thereby improving the structural stability of the material while significantly facilitating charge transport. Electrochemical testing confirmed the effectiveness of this strategy: at a current density of 500&#xa0;mA&#xa0;g⁻<sup>1</sup>, the NVP@C-rGO composite retained 71.1% of capacity after 600 cycles, compared to only 21.2% for unmodified NVP. Furthermore, due to the synergistic effect between rGO and MOF-derived NVP, the composite achieved a high specific capacity of 89.9&#xa0;mAh g⁻<sup>1</sup> under the same conditions, while NVP reached only 62.7&#xa0;mAh g⁻<sup>1</sup>. This significant improvement in performance, combined with the exceptional cycling stability and rate capability of the NVP@C-rGO||HC-rGO full cell, highlights the potential of the composite as a next-generation energy storage material for flexible and wearable electronic devices.</p>

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MOF-derived sodium vanadium phosphate composited C as stable cathode for flexible micro sodium-ion battery

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Caixia Li,
  • Peng Lu,
  • Xiaoxuan Ma,
  • Kun Zhang,
  • Chenglong Li

摘要

The rapid advancement of wearable electronic devices demands high-performance sodium-ion battery (SIB) cathode materials, particularly in terms of stability and electrochemical performance. Sodium super ionic conductor (NASICON)-type Na3V2(PO4)3 (NVP) has attracted significant attention due to its unique framework structure and high theoretical capacity. However, the inherently low electrical conductivity of NVP limits large-scale application. To address this issue, a novel NVP@C-rGO composite was synthesized using metal–organic frameworks (MOF) and reduced graphene oxide (rGO). The structures of these two forms of carbon enhance the charge transfer kinetics of NVP and provide two stress-buffering layers, thereby improving the structural stability of the material while significantly facilitating charge transport. Electrochemical testing confirmed the effectiveness of this strategy: at a current density of 500 mA g⁻1, the NVP@C-rGO composite retained 71.1% of capacity after 600 cycles, compared to only 21.2% for unmodified NVP. Furthermore, due to the synergistic effect between rGO and MOF-derived NVP, the composite achieved a high specific capacity of 89.9 mAh g⁻1 under the same conditions, while NVP reached only 62.7 mAh g⁻1. This significant improvement in performance, combined with the exceptional cycling stability and rate capability of the NVP@C-rGO||HC-rGO full cell, highlights the potential of the composite as a next-generation energy storage material for flexible and wearable electronic devices.