Triethyl Phosphate (TEP) Flame-Retardant Electrolyte Additive
CAS Number: 78-40-0
Triethyl phosphate (TEP) is a phosphorus-containing flame-retardant co-solvent and additive for lithium-ion battery electrolytes, reducing flammability and improving thermal runaway resistance without severely compromising ionic conductivity. It is used in fire-safe electrolyte formulations for EV and grid-scale energy storage.
Technical Specifications
| appearance | Colorless transparent liquid |
| purity (%) | ≥99.5 |
| P content (%) | ≥17.5 |
| acidity (ppm) | ≤20 |
| moisture (ppm) | ≤50 |
| density (g/mL, 20°C) | 1.067–1.072 |
Applications
- Flame-retardant electrolyte co-solvent (5–20 vol%)
- Thermal runaway suppression in large-format pouch cells
- Grid-scale energy storage safety electrolyte
- EV battery thermal management enhancement
- Solid-state battery interface wetting agent
Key Features
- High phosphorus content (≥17.5%) provides effective gas-phase flame inhibition
- Lower self-extinguishing time versus standard carbonate electrolytes
- Stable in combination with LiPF6 at typical electrolyte operating temperatures
- Available in battery-grade purity with moisture content ≤50 ppm
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