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Updated: May 28, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Quantitative MAS NMR characterization of the LiMn(1/2)Ni(1/2)O(2) electrode/electrolyte interphase
M Cuisinier1, J F Martin, P Moreau
1Institut des Matériaux Jean Rouxel (IMN), Université de Nantes-CNRS, UMR6502, 2 rue de la Houssinière, 44322 Nantes cedex 3, France.
Degradation at battery interfaces is better understood using advanced NMR and microscopy. Modified electrolytes create a less resistive interphase, improving battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Interfacial degradation in lithium-ion batteries is poorly understood.
- Traditional techniques struggle to analyze interfacial films accurately.
- LiNi(1/2)Mn(1/2)O(2) with LiPF(6) electrolyte is a common system.
Purpose of the Study:
- To investigate interphase growth and evolution on LiNi(1/2)Mn(1/2)O(2) during storage and cycling.
- To understand the electrochemical consequences of these interphases.
- To compare the effects of standard LiPF(6) electrolyte with a LiBOB-modified electrolyte.
Main Methods:
- Quantitative (7)Li, (19)F, and (31)P Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR).
- Transmission Electron Microscopy (TEM).
- Electron Energy Loss Spectroscopy (EELS).
Main Results:
- At room temperature, LiF and lithiated organic species form on the surface.
- At 55°C, the interphase thickens, increasing lithiated species by 240% and forming fluorophosphates (-POF(2)).
- LiBOB-modified electrolyte yields a Li-enriched, less resistive interphase with LiF and non-lithiated species.
Conclusions:
- Temperature significantly impacts interphase composition and gradient.
- LiBOB-modified electrolytes offer improved interfacial properties compared to standard LiPF(6).
- Advanced surface analysis techniques are crucial for understanding battery degradation mechanisms.
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