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Oxide Coating Role on the Bulk Structural Stability of Active LiMn2O4 Cathodes
Francesco Paparoni1,2, Emin Mijit1, Hamideh Darjazi3
1Sez. Fisica, Scuola di Scienze e Tecnologie, Universitá di Camerino, via Madonna delle Carceri, I-62032 Camerino, Italy.
Summary
Alumina coating on lithium manganese oxide cathodes prevents degradation by inhibiting manganese disproportionation, enhancing battery performance and stability. This protective layer maintains structural integrity during cycling.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Protective coatings enhance battery electrode performance.
- Alumina coating on LiMn2O4 cathodes improves efficiency, but the mechanism is unclear.
Purpose of the Study:
- Investigate alumina coating effects on LiMn2O4 structural dynamics.
- Correlate coating-induced changes with solid electrolyte interface dynamics.
Main Methods:
- Soft X-ray absorption spectroscopy (Mn L-edges, O K-edge) for surface analysis.
- Hard X-ray absorption spectroscopy (Mn K-edge) for bulk analysis.
- Comparative study of coated and uncoated LiMn2O4 at various charge states.
Main Results:
- Alumina coating effectively suppresses Mn3+ disproportionation and active material degradation.
- Uncoated electrodes show side products (Li2MnO3, MnO) and crystal symmetry changes.
- Coating preserves the stability of the passivation layer and bulk structure.
Conclusions:
- Alumina coating provides significant protection to LiMn2O4 cathodes.
- The mechanism involves hindering Mn3+ disproportionation and stabilizing the electrode structure.
- This study clarifies the role of alumina coating in improving battery performance.
