Technical Selection Guide
Why is Ethyl methyl carbonate (EMC) used in battery electrolytes?
Ethyl methyl carbonate (EMC) is an asymmetric linear carbonate used to lower viscosity and broaden the liquid range of EC-based electrolytes. It is common in high-energy lithium-ion and wide-temperature formulation work.
Why developers evaluate it
- Relevant to wide-temperature carbonate blends
- Provides a distinct viscosity, polarity, or coordination profile
- Useful in controlled solvent-blend comparisons
Development considerations
- Optimize volatility, salt concentration, and formation additives
- 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.