Dimethyl carbonate

Example

Use in Lemonergy

Connect transport with electronic isolation.

This is a reference concept. No executable Lemonergy block has been verified for this term.

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Carbonate solvent

The organic liquids that dissolve the lithium salt: cyclic ethylene carbonate, which forms a stable SEI, blended with linear carbonates such as DMC or EMC to lower viscosity. All are flammable, which is a root of lithium-ion fire risk.

Diethyl carbonate

A linear carbonate solvent with a higher boiling point and viscosity than DMC, used in blends that must tolerate higher temperatures. Typical electrolytes mix EC with one or two of DMC, EMC and DEC.

Ethylene carbonate

The cyclic carbonate solvent that every graphite cell needs: it is reduced on the first charge into the stable SEI that lets graphite work at all. It is solid at room temperature, so it is always blended with linear carbonates.

Ethyl methyl carbonate

A linear carbonate solvent, the most common co-solvent in commercial electrolytes, balancing viscosity, boiling point and low-temperature performance between DMC and DEC.

Flammability

The property that makes lithium-ion fires hard to fight: the carbonate solvents have flash points near room temperature, and the positive electrode releases its own oxygen when hot, so the fire does not need air. Solid and non-flammable electrolytes aim to remove this.

References & further reading

Technical references

1. Electrolytes and Interphases in Li-Ion Batteries and Beyond

   Kang Xu · Chemical Reviews · 2014

   Technical reference · Electrolyte salts, solvents, additives and electrode interphases.