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<p>The rheological behavior of lithium-ion battery slurries composed of LiFePO<sub>4</sub> and graphite with two polyvinylidene fluoride (PVDF) binders, HSV900 and KF1100, was investigated using steady-state, transient shear flow, creep, and dynamic oscillatory shear experiments. The study revealed that the HSV900 binder, due to its higher molecular weight, imparted higher viscosity, while KF1100 slurries demonstrated improved flowability. The results also highlighted thixotropic recovery in transient shear tests, indicating a time-dependent structural breakdown and reformation. The creep experiments showed a transition from solid-like to fluid-like states at increasing shear stress, with HSV900-based slurries exhibiting stronger structural stability. Dynamic shear tests confirmed the superior elastic properties and network stability of HSV900-based slurries, making them ideal for low-frequency, high-stress applications. In contrast, KF1100-based slurries were more suited for high-shear and high-frequency environments. These findings provide critical insights for optimizing slurry formulations based on binder properties to meet specific manufacturing and operational conditions.</p>

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Rheological Properties of Lithium-ion Battery Slurries Composed of LiFePO4 and Graphite: Effects of HSV900 and KF1100 Binders

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Junpeng Luo,
  • Bin Zhao,
  • Minghui Zhao

摘要

The rheological behavior of lithium-ion battery slurries composed of LiFePO4 and graphite with two polyvinylidene fluoride (PVDF) binders, HSV900 and KF1100, was investigated using steady-state, transient shear flow, creep, and dynamic oscillatory shear experiments. The study revealed that the HSV900 binder, due to its higher molecular weight, imparted higher viscosity, while KF1100 slurries demonstrated improved flowability. The results also highlighted thixotropic recovery in transient shear tests, indicating a time-dependent structural breakdown and reformation. The creep experiments showed a transition from solid-like to fluid-like states at increasing shear stress, with HSV900-based slurries exhibiting stronger structural stability. Dynamic shear tests confirmed the superior elastic properties and network stability of HSV900-based slurries, making them ideal for low-frequency, high-stress applications. In contrast, KF1100-based slurries were more suited for high-shear and high-frequency environments. These findings provide critical insights for optimizing slurry formulations based on binder properties to meet specific manufacturing and operational conditions.