Issue 19, 2024

Insights into a surface-modified Li(Ni0.80Co0.15Al0.05)O2 cathode by atomic layer fluorination for improved cycling behaviour

Abstract

Li(Ni0.80Co0.15Al0.05)O2 is a lithium-ion battery cathode, commercially available for more than twenty years, which is associated with high energy capacity and high energy density, with moderate power. Atomic layer fluorination (ALF) of Li(Ni0.80Co0.15Al0.05)O2 with XeF2 is performed to improve its cyclability. The ALF method aims at forming an efficient protecting fluorinated layer at the surface of the material, with a low fluorine content. Surface fluorinated Li(Ni0.80Co0.15Al0.05)O2 is characterized by X-ray diffraction, electron microscopy, 19F nuclear magnetic resonance, X-ray photoelectron spectroscopy, and galvanostatic measurements, and a fluorine content as low as 1.4 wt% is found. The presence of fluorine atoms improves the electrochemical performances of Li(Ni0.80Co0.15Al0.05)O2: cyclability, polarization and rate capability are improved. Operando infrared spectroscopy and post-mortem gas chromatography provide some insights into the origins of these improvements.

Graphical abstract: Insights into a surface-modified Li(Ni0.80Co0.15Al0.05)O2 cathode by atomic layer fluorination for improved cycling behaviour

Supplementary files

Article information

Article type
Communication
Submitted
28 feb 2024
Accepted
24 apr 2024
First published
25 apr 2024
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2024,53, 8105-8111

Insights into a surface-modified Li(Ni0.80Co0.15Al0.05)O2 cathode by atomic layer fluorination for improved cycling behaviour

Y. Charles-Blin, O. Hatim, M. Clarac, A. Perbost, S. Liminana, L. Lopez, O. Gimello, K. Guérin, M. Dubois, M. Deschamps, D. Flahaut, H. Martinez, L. Monconduit and N. Louvain, Dalton Trans., 2024, 53, 8105 DOI: 10.1039/D4DT00600C

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