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<p>Lithium-ion batteries are pivotal in the development of advanced compact energy storage systems. In this study, the network-structured lithium iron phosphate-polyethylene oxide-polyvinylidene fluoride (LFP–PEO–PVDF) electrodes, the PEO electrolyte and PEO/LFP–PEO–PVDF composite electrodes were prepared by 3D gel printing (3DGP). The binder of the LFP–PEO–PVDF electrode is a PEO–PVDF composite binder, and the different PEO–PVDF ratios in the binder were varied with pure PEO (no PVDF), 9:1, 7:3 and 5:5, which corresponded to four electrode slurries. The results show that the electrodes printed with a PEO–PVDF ratio of 7:3 exhibited good shape retention capability and electrochemical performance. The printing slurry of 7:3-electrode had the apparent viscosity of 1.20&#xa0;Pa s at a shear rate of 358.2&#xa0;s<sup>−1</sup>, which was suitable for printing. The electrochemical measurement results show that the capacity retention rates of the network-structured electrodes with 7:3-electrode was 85.5% after 300 cycles at 0.5&#xa0;C. The incorporation of PVDF into the binder improved the structural retention capability and capacity retention rate of the electrode during cycling. The printed PEO electrolyte shows good shape retention and uniform thickness, with an ionic conductivity of 1.32&#xa0;mS&#xa0;cm<sup>−1</sup> at 60&#xa0;°C. The PEO/LFP–PEO–PVDF composite electrodes demonstrate good interfacial contact between the electrode and electrolyte layers, and the composite electrodes delivered a specific capacity of 97.2&#xa0;mAh&#xa0;g<sup>−1</sup> and a capacity retention rate of 71.7% after 50 cycles at 0.1&#xa0;C.</p>

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Effect of polyethylene oxide on 3D-printed PEO/LFP–PEO–PVDF composite electrodes

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Tielin Wang,
  • Jiahao Ji,
  • Jingli Wen,
  • Zhaoxia Yang,
  • Tao Lin,
  • Fang Lian,
  • Nan Meng,
  • Huiping Shao

摘要

Lithium-ion batteries are pivotal in the development of advanced compact energy storage systems. In this study, the network-structured lithium iron phosphate-polyethylene oxide-polyvinylidene fluoride (LFP–PEO–PVDF) electrodes, the PEO electrolyte and PEO/LFP–PEO–PVDF composite electrodes were prepared by 3D gel printing (3DGP). The binder of the LFP–PEO–PVDF electrode is a PEO–PVDF composite binder, and the different PEO–PVDF ratios in the binder were varied with pure PEO (no PVDF), 9:1, 7:3 and 5:5, which corresponded to four electrode slurries. The results show that the electrodes printed with a PEO–PVDF ratio of 7:3 exhibited good shape retention capability and electrochemical performance. The printing slurry of 7:3-electrode had the apparent viscosity of 1.20 Pa s at a shear rate of 358.2 s−1, which was suitable for printing. The electrochemical measurement results show that the capacity retention rates of the network-structured electrodes with 7:3-electrode was 85.5% after 300 cycles at 0.5 C. The incorporation of PVDF into the binder improved the structural retention capability and capacity retention rate of the electrode during cycling. The printed PEO electrolyte shows good shape retention and uniform thickness, with an ionic conductivity of 1.32 mS cm−1 at 60 °C. The PEO/LFP–PEO–PVDF composite electrodes demonstrate good interfacial contact between the electrode and electrolyte layers, and the composite electrodes delivered a specific capacity of 97.2 mAh g−1 and a capacity retention rate of 71.7% after 50 cycles at 0.1 C.