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August 19, 2026ACS Applied Materials & Interfaces

Efficient Fabrication of PVDF Separators with Excellent Thermal Stability and High Ionic Conductivity by Melt Blending for Lithium Metal Batteries

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Authors

WZWeilong ZhouMedical ProtectiveYCYunjia CaiHuazhong University of Science and Technology HospitalRTRui TongMedical Protective

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Implication

Materials study reveals thermally stable melt-blended PVDF separators suppress dendrites in lithium metal batteries, indicating enhanced safety and cycle life for next-generation energy storage.

Key Points

  • Develop high-safety battery separators with superior thermal stability and high ionic conductivity via melt blending to overcome the degradation issues of commercial polyolefin separators in lithium metal batteries.
  • Fabricated three-dimensional porous separators using polyvinylidene fluoride (PVDF) matrix and dibutyl phthalate (DBP) diluent via melt blending at an optimized 4:6 mass ratio (PD46).
  • Characterized separator microstructure, thermal shrinkage at 150 °C, ionic conductivity, and lithium-ion transference numbers.
  • Tested electrochemical stability and dendrite suppression in Li||PD46||Li symmetric cells at 0.5 mA cm–2 and Li||PD46||LiFePO4 full cells at a 1C cycling rate.
  • PD46 separators exhibited thermal shrinkage of 4.5% at 150 °C, an ionic conductivity of 1.23 mS cm–1, and a Li+ transference number of 0.73.
  • Li||PD46||Li symmetric cells maintained stable cycling without short circuits for over 1500 h at 0.5 mA cm–2 due to lithium dendrite suppression.
  • Li||PD46||LiFePO4 full cells retained greater than 95% capacity after 1350 cycles at a 1C discharge rate.

Cite This Study

Zhou et al. (2026) studied this question.

synapsesocial.com/papers/6a85637603308d306e2d6951https://doi.org/10.1021/acsami.6c08889
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