Related Experiment Video
Updated: Jun 27, 2025
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.5K
Insights into a surface-modified Li(Ni0.80Co0.15Al0.05)O2 cathode by atomic layer fluorination for improved cycling
Youn Charles-Blin1,2,3, Oumaima Hatim1, Mélissa Clarac1
1Institut Charles Gerhardt Montpellier, Université de Montpellier, CNRS, 34095 Montpellier, France. nicolas.louvain@umontpellier.fr.
Dalton Transactions (Cambridge, England : 2003)
|May 2, 2024
Summary
Atomic layer fluorination enhances lithium-ion battery cathodes by creating a protective surface layer. This improves battery cyclability, reduces polarization, and boosts rate capability for better performance.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Lithium nickel cobalt aluminum oxide (NCA) is a widely used cathode material for lithium-ion batteries, known for its high energy density.
- Improving the cyclability and electrochemical performance of NCA remains a key challenge for advanced battery applications.
Purpose of the Study:
- To enhance the electrochemical performance of Li(Ni0.80Co0.15Al0.05)O2 through atomic layer fluorination (ALF).
- To investigate the formation of a protective fluorinated layer and its impact on material properties.
Main Methods:
- Atomic layer fluorination (ALF) using Xenon difluoride (XeF2).
- Characterization using X-ray diffraction, electron microscopy, 19F NMR, XPS, and galvanostatic measurements.
- Electrochemical performance evaluation including cyclability, polarization, and rate capability.
Main Results:
- Successful formation of a surface fluorinated layer on Li(Ni0.80Co0.15Al0.05)O2 with low fluorine content (1.4 wt%).
- Significant improvements in cyclability, reduced polarization, and enhanced rate capability observed after ALF.
- Operando infrared spectroscopy and post-mortem gas chromatography provided insights into the improvement mechanisms.
Conclusions:
- Atomic layer fluorination is an effective method for improving the electrochemical performance of Li(Ni0.80Co0.15Al0.05)O2 cathodes.
- The protective fluorinated surface layer mitigates degradation pathways, leading to enhanced battery longevity and efficiency.
