Technical Selection Guide
Why is Diethyl carbonate (DEC) used in battery electrolytes?
Diethyl carbonate (DEC) is a low-viscosity linear carbonate commonly blended with cyclic carbonates to improve electrolyte fluidity, electrode wetting, and low-temperature transport.
Why developers evaluate it
- Relevant to conventional carbonate blends
- Provides a distinct viscosity, polarity, or coordination profile
- Useful in controlled solvent-blend comparisons
Development considerations
- Balance volatility and transport against ec or other cyclic-carbonate content
- Measure conductivity and viscosity in the final salt concentration
- Validate formation, gas, storage, and temperature behavior in cells
How to compare it
A solvent should not be selected from boiling point or dielectric constant alone. Compare matched formulations for salt solubility, ionic conductivity, viscosity, electrode wetting, first-cycle efficiency, EIS, gas, and retention over the intended temperature range.