Polytetrafluoroethylene (PTFE)
CAS Number 9002-84-0
Battery Binders, Battery Materials, Sodium-Ion Battery Materials
A perfluorinated polymer binder
used in dry-processed electrodes and composite membranes for batteries
Overview | Product Information | Related Products | Technical Support
Polytetrafluoroethylene (CAS number 9002-84-0), widely known as PTFE or Teflon, is a perfluorinated ethylene polymer. PTFE is chemically inert, due to its C-F short bond length (ca. 1.35 Å) and high bond energy (ca. 130 kcal/mol). It is also thermally stable, decomposing only at temperatures above 260 °C.
PTFE is one of the most widely studied binders for solvent-free dry electrode processing in battery fabrication. During high shearing mixing, PTFE undergoes phase transformation forming nano-fibrils. The fibrous network of PTFE assists in maintaining the integrity of the active cathode materials against the volume change during the charging-discharging process. Long term cycling stability test shows capacity retention of 97% after 200 cycles at C/3 with 0.5 wt% PTFE binder. In aqueous zinc-ion batteries, PTFE provides hydrophobicity, facilitating the desolvation behavior of zinc-ions. This results in an average specific capacity of 149.8 mAh/g at 2A/g.
As a multifunctional binder, PTFE increases electrochemical active sites and enhances mass transfer of the electrodes in oxygen evolution reaction. The electrode incorporating with PTFE exhibits long term stability with a low decay rate of 0.034 mV/h at 500 mA/cm2 for 1000 hours.
PTFE polymer
used as a binder for dry-proccessing electrodes
Perfluorinated polymer
chemically inert and thermal stable
Forms nanofibrils
stablizing active cathode materials
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General Information
| CAS Number | 9002-84-0 |
|---|---|
| Chemical Formula | (C2F4)n |
| Full Name | Poly(1,1,2,2-tetrafluoroethylene) |
| Synonyms | Poly(tetrafluoroethene), Poly(tetrafluoroethylene), Teflon, PTFE |
| Classification or Family | Lithium-ion batteries, battery binder materials, fluorinated binders, sodium ion batteries, solid state batteries, polymer composite electrolytes, oxygen evolution, solid state batteries |
Chemical Structure
Product Details
| Bulk Density | 0.47 g/ml (JIS K6892) |
|---|---|
| Standard Specific Gravity | 2.160 (ASTM D4895) |
| Molecular Weight | ca. 5,000,000 |
| Particle Size | 580 μm (JIS K6891) |
| Extrusion Pressure (RR36) | 130 daN (Daikin method) |
| Appearance | White powder |
MSDS Documentation
Polytetrafluoroethylene (PTFE) MSDS Sheet
References
- Paving the way for next-generation all-solid-state batteries: dry electrode technology, J. Mun et al., Adv. Mater., 2506123 (2025); DOI: 10.1002/adma.202506123.
- Cathode-electrolyte interface modification by binder engineering for high-performance aqueous zinc-ion batteries, H. Dong et al., Adv. Sci., 10, 2205084 (2023); DOI: 10.1002/advs.202205084.
- PTFE as a multifunctional binder for high-current-density oxygen evolution, B. Deng et al., Adv. Sci., 11, 2408544 (2024); DOI: 10.1002/advs.202408544.
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