PP/PE Ceramic PVDF Wet Coating Separator for Lithium-sulfur Ion Batteries

GRE-13FW2-2 separator is a PP/PE-based microporous battery separator engineered with a wet-coated PVDF ceramic functional layer on both sides to improve interfacial stability, electrolyte wettability, and dimensional reliability in demanding cell chemistries such as lithium–sulfur (Li–S) and high-rate lithium-ion research. The structure is designed as a multilayer film (2 µm PVDF + 9 µm PE + 2 µm PVDF), helping maintain ionic transport while adding a mechanically robust, better-wetting barrier layer.

Working principle

In electrochemical cells, the separator electrically isolates the electrodes while providing ion-conducting pathways through electrolyte-filled pores. A PVDF/ceramic wet coating can enhance electrolyte uptake and interfacial contact, supporting more stable cycling and reducing localised hot spots by improving uniform wetting and mechanical integrity. In Li–S research, functional coatings are commonly used as part of a broader strategy to mitigate parasitic species transport and improve operational stability.

Key specifications (typical / requirements)

• Total thickness: 9 + 2 + 2 µm (two-side coating); base film thickness spec: 13 ± 2 µm (typical 13 µm)
• Surface density: 5.5 g/m² (requirement 5.5 ± 3 g/m²)
• Gurley air permeability: 235 s/100 mL (range 180–320)
• Tensile strength: MD 200 MPa (≥120), TD 150 MPa (≥110)
• Thermal shrinkage (105 ± 2 °C, 1 h): MD 0.4% (≤1.5), TD 0.2% (≤1.0)
• Puncture strength: 4.5 N (≥3.5)
  
  

Compatibility & applications

Suitable for pouch, coin, and lab-scale cylindrical/prismatic R&D builds where researchers want improved separator wetting and robustness. Pair with ScienceGears potentiostats/galvanostats, battery cyclers, and compatible cell hardware for separator screening, electrolyte optimisation, and Li–S protocol development.