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<p>Sodium-ion batteries (SIBs) have emerged as cost-effective alternatives to lithium-ion batteries for large-scale energy storage, yet their development relies on high-performance cathode materials. While Na<sub>2</sub>FeP<sub>2</sub>O<sub>7</sub> offers structural stability and economic advantages, its practical application is hindered by poor electronic conductivities. Herein, we design a two-step synthesis strategy to construct Na<sub>2</sub>FeP<sub>2</sub>O<sub>7</sub> films on mechanically exfoliated multilayer graphene (MLG), involving in-situ chemical deposition of Fe<sub>2</sub>O<sub>3</sub> followed by solid-phase conversion to Na<sub>2</sub>FeP<sub>2</sub>O<sub>7</sub>. The resulting composite features well interfacial contact between Na<sub>2</sub>FeP<sub>2</sub>O<sub>7</sub> films and MLG nanosheets, which effectively addresses conductivity limitations. As a cathode, the NFPO/MLG composite demonstrates superior electrochemical performance, delivering 95.3 mAh g⁻¹ at 0.2&#xa0;C with remarkable rate capability (75.6 mAh g⁻¹ at 10&#xa0;C) and exceptional cycling stability (98.7% retention after 1000 cycles at 2&#xa0;C). This work provides a general interfacial engineering approach to enhance pyrophosphate-based cathodes for advanced energy storage systems.</p>

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Na2FeP2O7 films on multilayer graphene for high-performance cathodes of sodium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Junming Xu,
  • Xinqi Ding,
  • Jianqiang Yang,
  • Wenyi He,
  • Dongdong Xu,
  • Liang Chu

摘要

Sodium-ion batteries (SIBs) have emerged as cost-effective alternatives to lithium-ion batteries for large-scale energy storage, yet their development relies on high-performance cathode materials. While Na2FeP2O7 offers structural stability and economic advantages, its practical application is hindered by poor electronic conductivities. Herein, we design a two-step synthesis strategy to construct Na2FeP2O7 films on mechanically exfoliated multilayer graphene (MLG), involving in-situ chemical deposition of Fe2O3 followed by solid-phase conversion to Na2FeP2O7. The resulting composite features well interfacial contact between Na2FeP2O7 films and MLG nanosheets, which effectively addresses conductivity limitations. As a cathode, the NFPO/MLG composite demonstrates superior electrochemical performance, delivering 95.3 mAh g⁻¹ at 0.2 C with remarkable rate capability (75.6 mAh g⁻¹ at 10 C) and exceptional cycling stability (98.7% retention after 1000 cycles at 2 C). This work provides a general interfacial engineering approach to enhance pyrophosphate-based cathodes for advanced energy storage systems.