Succinonitrile (SN) Solid Electrolyte Additive
CAS Number: 110-61-2
Succinonitrile (SN) is a nitrile-based solid-state electrolyte additive and co-solvent that improves lithium-ion conductivity in solid polymer electrolytes and acts as a cathode-stabilizing additive in liquid electrolytes at elevated voltages. Its high dielectric constant facilitates lithium salt dissolution and reduces interfacial resistance.
Technical Specifications
| appearance | White crystalline solid |
| purity (%) | ≥99.5 |
| N content (%) | ≥28.5 |
| moisture (ppm) | ≤50 |
| melting point (°C) | 54–58 |
Applications
- Solid-state polymer electrolyte (PEO/SN) plasticizer
- High-voltage (>4.5V) liquid electrolyte additive
- Quasi-solid and gel electrolyte formulation
- Lithium-sulfur battery electrolyte stabilizer
- Ionic conductivity enhancement in solid electrolytes
Key Features
- High dielectric constant (ε≈55) enables efficient lithium salt dissociation
- Lowers glass transition temperature of PEO electrolytes for room-temperature operation
- Cyano groups coordinate with cathode surface, forming protective CEI layer
- Low toxicity and good thermal stability up to 265°C (boiling point)
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