Vinylene 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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Electrolyte additive

A compound added to the electrolyte at a few percent to improve one property — vinylene carbonate and fluoroethylene carbonate build a tougher SEI, others suppress gassing or overcharge. Additive packages are among a cell maker’s closest secrets.

Fluoroethylene carbonate

A fluorinated additive, sometimes a co-solvent, that forms a lithium-fluoride-rich SEI able to survive the large volume changes of silicon and lithium-metal electrodes. It is almost universal in silicon-blend cells.

Formation

The first controlled charge and discharge cycles of a newly assembled cell, during which the SEI forms. It is part of cell production, before aging and grading.

Solid–electrolyte interphase

A film of electrolyte reaction products on the negative-electrode particles — graphite, and also silicon or lithium metal. It protects the electrode from further reaction but grows slowly for the whole life of the cell, consuming cyclable lithium.

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.