The FS-5P is a double-layered separator comprised of a 180 µm thick nonvowen PP cloth (Freudenberg FS 2226 E) and a 38 µm thick microporous UHMW-PE membrane (Lydall Solupor 5P09B). We offer PAT insulation sleeves with this FS-5P separator, either with or without a lithium reference. When built into the PAT insulation sleeve, the PE membrane of the double-layered separator is always pointing to the lower electrode of the PAT-Core.
FS-5P shows excellent wettability by all common Li-ion battery electrolytes thanks to the high porosity of the two layers and a special surface treatment of the PP fibers.We consider, in many cases, F5-5P as the better and glass-free replacement of GF/A glass fiber (260 µm thick).
For use with the PAT-Core, we recommend a lower plunger height that exceeds the thickness of the lower electrode by approx. 100 µm (about half of the thickness of the compressed FS-5P separator). For example, for a 120 µm thick cathode as the lower electrode in the PAT-Core, use a lower plunger with a height number of 200 or 250.
The table below shows a comparison of our standard separator materials:
| Separator | FS-5P (Freudenberg Viledon FS 2226E + Gore Heerlen Solupor 5P09B) | Whatman GF/A | Celgard QT17P2HX |
| Thickness | 220µm | 260µm | 16.5µm |
| Material | PP fiber/PE membrane | Borosilicate glass fiber | PVDF/PP/PE/PP/PVDF |
| Porosity | FS: 67%/ 5P: 86% | 91% | 54% |
| Wettability | Good | Excellent | Good |
| Resistance to dendrites | Good | Modest | Good |
| Ability for full cell cycle tests | Good | Good | Good |
| Ability for half cell cycle tests (vs. Li) | Good | Good | Modest |
| Ability for full cell EIS | Excellent | Excellent | Excellent |
| Ability for individual electrode EIS | Modest | Good | Modest |
| Order no (Insulation sleeve (PP) with Li reference) | ECC1-00-0210-V/X | ECC1-00-0210-O/X |
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