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<p>Dry electrode manufacturing methods that do not use NMP can reduce the time and energy required to produce lithium-ion batteries. Polyvinylidene fluoride (PVDF) is a commonly used binder in the dry process. However, there is a lack of research on the effect of dry process parameters on PVDF crystalline types. In our work, the dry process parameters of graphite anode with PVDF as binder are studied, such as the effects of temperature, pressure, and time on the crystallization of PVDF. The effects of powder mixing process and binder content on the performance of dry graphite electrodes are investigated. PVDF processed at 180&#xa0;°C, 6&#xa0;MPa, and for 15&#xa0;min under hot pressing conditions favors the presence of β-crystalline forms. The capacity retention of the prepared electrodes with 10% PVDF loading is superior to that of conventional wet electrodes. Subsequently, reducing PVDF to 5% induces additional cycling stability and rate handling improvements of the dry electrode. </p> Graphical abstract <p></p>

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Influence of drying process conditions on graphite anode properties and crystalline type of polyvinylidene fluoride binder

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Lijing Niu,
  • Jiajia Zhao,
  • Mengmeng Xie,
  • Xunyong Jiang

摘要

Dry electrode manufacturing methods that do not use NMP can reduce the time and energy required to produce lithium-ion batteries. Polyvinylidene fluoride (PVDF) is a commonly used binder in the dry process. However, there is a lack of research on the effect of dry process parameters on PVDF crystalline types. In our work, the dry process parameters of graphite anode with PVDF as binder are studied, such as the effects of temperature, pressure, and time on the crystallization of PVDF. The effects of powder mixing process and binder content on the performance of dry graphite electrodes are investigated. PVDF processed at 180 °C, 6 MPa, and for 15 min under hot pressing conditions favors the presence of β-crystalline forms. The capacity retention of the prepared electrodes with 10% PVDF loading is superior to that of conventional wet electrodes. Subsequently, reducing PVDF to 5% induces additional cycling stability and rate handling improvements of the dry electrode.

Graphical abstract