EP (Ethyl Propionate, >99.95%, Anhydrous) Liquid as Battery Electrolyte Solvent, 200 g/bottle, CBESEP
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Ethyl propionate (EP) is a low-viscosity, low-melting-point carboxylate ester widely utilized as a co-solvent in wide-temperature, fast-charging, and abuse-tolerant non-aqueous electrolytes.
The main physical features of the EP solvent are: (1) Melting and Boiling Points: EP features a melting point of -73.9°C and a higher boiling point of 99°C (compared to ethyl acetate's 77°C), offering a more favorable volatility and flash-point safety profile. (2) Viscosity: Exhibits a low bulk viscosity (~ 0.55 cP at room temperature), maintaining fluid dynamics and rapid Li+ solvation sheath reorganization at sub-zero temperatures. (3) Dielectric Constant: Possesses a modest relative permittivity (~ 6.0), requiring high-permittivity cyclic carbonates (e.g., EC) or elevated salt concentrations to ensure effective lithium salt dissociation.
The critical advantages in battery electrolytes are: (1) Wide-Temperature Operation: EP-containing electrolyte blends retain high ionic conductivity and reversible capacity across extreme thermal ranges, frequently deployed in environments down to -40°C and below. (2) Enhanced Thermal & Volatility Safety: Its higher boiling point and reduced vapor pressure relative to shorter-chain esters (like methyl acetate or ethyl acetate) mitigate gassing and thermal runaway risks under high-rate abuse. (3) Superior Rate Capability: Low viscosity and rapid ion diffusion kinetics support high continuous C-rates and fast-charging protocols.
| Part Number |
CBESEP (C-BES-EP) |
| CAS |
105-37-3 |
| Chemical Formula |
CH3CH2COOC2H5  |
| Appearance |
Colorless Liquid |
| Purity |
>99.95% (Battery Grade) Water level: <50 ppm Acid level: <50 ppm |
| Molecular Weight | 102.13 g/mol |
| Boiling Point | 99 °C (lit.) |
| Package Size | 200 g/bottle (500 g, and 1 kg, and even large grade can also be supplied with better price) |
Notes: Please store the EP liquid in a dry place (glovebox is the best option).
References:
- M. C. Smart, et al. Use of Organic Esters as Cosolvents in Electrolytes for Lithium-Ion Batteries with Improved Low Temperature Performance, J. Electrochem. Soc., 2002, 149, A361.
- M. C. Smart, et al. Li-Ion Electrolytes Containing Ester Co-Solvents for Wide Operating Temperature Range, ECS Trans., 2008, 11, 99