Prop-1-ene-1,3-sultone (PS) Electrolyte Additive
CAS Number: 1120-71-4
Prop-1-ene-1,3-sultone (PS) is an SEI-forming electrolyte additive that generates a sulfonate-rich SEI layer on both graphite and silicon anodes, improving overcharge protection, cycle stability, and high-temperature performance. Used at 0.5–2 wt% in commercial electrolyte formulations for NMC and NCA cells.
Technical Specifications
| appearance | Colorless to pale yellow liquid |
| purity (%) | ≥99.5 |
| acidity (ppm) | ≤20 |
| moisture (ppm) | ≤30 |
| density (g/mL, 25°C) | 1.320–1.330 |
Applications
- NMC and NCA cell electrolyte additive (0.5–2 wt%)
- Overcharge protection co-additive
- High-temperature storage electrolyte stabilizer
- Silicon-graphite composite anode SEI former
- Cycle stability improver for pouch cells
Key Features
- Forms sulfonate-containing SEI providing superior overcharge tolerance
- Reduces transition metal dissolution from NMC cathodes at elevated temperatures
- Compatible with FEC and VC for multi-additive electrolyte optimization
- Improves low-rate capacity retention after extended high-temperature storage
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