Interphase formation on Al2O3-coated carbon negative electrodes in lithium-ion batteries

09 October 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Interfacial coatings show promise in stabilizing carbon negative electrodes for lithium-ion batteries. For example, applying nanometer scale Al2O3 coatings on carbon can improve fast-charging, low-temperature battery performance, and cycle life. However, the exact mechanism by which these interfacial films stabilize negative electrodes in lithium-ion batteries remains poorly understood. Here, we show that Al2O3 coatings on carbon negative electrodes undergo structural and chemical changes during the formation of the solid-electrolyte interphase (SEI) at low potentials. During formation, we find a conformal bilayer SEI on Al2O3-coated carbon electrodes, with each layer exhibiting distinct chemistry. Importantly, the SEI structure, chemistry, and uniformity differ substantially between Al2O3-coated carbon electrodes and uncoated carbon electrodes. Our results suggest that performance improvements are not solely due to the presence of the Al2O3 coating. Instead, we propose that the improved SEI structure, chemistry, and uniformity after formation are the key factors contributing to improvements in battery performance.


Solid Electrolyte Interphase
Electrode Coatings
Lithium Batteries
SEI Formation

Supplementary materials

Supplementary Information
Supplementary information


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.