1,3-Propane Sultone (1,3-PS) SEI Additive
CAS Number: 1120-71-4
1,3-Propane sultone (1,3-PS) is a ring-opening electrolyte additive that undergoes reductive decomposition on anodes to deposit a robust sulfonate-rich SEI, increasing cycle life and improving thermal stability of lithium-ion cells. Used at 1–3 wt%, it is compatible with major carbonate solvents and LiPF6 electrolytes.
Technical Specifications
| appearance | Colorless crystalline solid or liquid |
| purity (%) | ≥99.5 |
| acidity (ppm) | ≤20 |
| moisture (ppm) | ≤50 |
| density (g/mL, 25°C) | 1.390–1.400 |
Applications
- Graphite anode SEI additive (1–3 wt%)
- Thermal stability improvement for EV pouch cells
- High-voltage cathode protection co-additive
- Cycle life extension for energy-storage battery systems
- Electrolyte additive for lithium-titanate (LTO) anodes
Key Features
- Ring-opening reaction below 0.5V forms durable sulfonate-rich SEI layer
- Reduces electrolyte decomposition and gas generation during high-temperature operation
- Improves capacity retention over 500+ cycles in NMC/graphite cells
- Compatible with both LiPF6 and LiFSI-based electrolyte systems
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