Solid Electrolyte Interphase

Solid Electrolyte Interphase (SEI) is formed on electrode surfaces from decomposition products of electrolytes. The SEI allows Li+ transport and blocks electrons in order to prevent further electrolyte decomposition and ensure continued electrochemical reactions.

The solid electrolyte interphase (SEI) is primarily formed in the first battery cycle from the reduction of the electrolyte, and allows Li ion transport while preventing further electrolyte decomposition.

The SEI layer formation can be improved with electrolyte additives.

References

  1. Shan Yan, Amy C. Marschilok, Conversion-Type Electrodes for Rechargeable Lithium Based Batteries: Case Studies of Iron Based Conversion Materials for Lithium-Ion Batteries and Molybdenum Disulfides for Lithium-Sulfur Batteries, Editor(s): Luisa F. Cabeza, Encyclopedia of Energy Storage, Elsevier, 2022, Pages 36-46, ISBN 9780128197301
  2. S. Hamidreza Beheshti, Mehran Javanbakht, Hamid Omidvar, Md Sazzad Hosen, Annick Hubin, Joeri Van Mierlo, Maitane Berecibar, Development, retainment, and assessment of the graphite-electrolyte interphase in Li-ion batteries regarding the functionality of SEI-forming additives, iScience, Volume 25, Issue 3, 2022