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Mitigating the Rock-Salt Phase Transformation in Disordered LNMO Through Synergetic Solid-State AlF3/LiF

Xingqi Chang1,2, Carlos Escudero3, Ashley P Black3

  • 1Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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PubMed
Summary
This summary is machine-generated.

This study enhances lithium-ion battery cathode materials using a LiF and AlF3 modification, improving cycle life and stability. The optimized material shows high capacity and excellent performance in full cells.

Keywords:
disordered spinel LiNi0.5Mn1.5O4 (LNMO)generation 3b batteriesoperando SXRDoperando XASrock‐saltsolid‐state synthesis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-voltage disordered spinel LiNi0.5Mn1.5O4 is crucial for high power density lithium-ion batteries.
  • Poor cycle life due to rock-salt phase transformation limits its practical application.
  • Developing stable cathode materials is essential for advanced battery technologies.

Purpose of the Study:

  • To enhance the electrochemical performance and cycle life of LiNi0.5Mn1.5O4.
  • To mitigate the rock-salt phase transformation through synergistic solid-state modification.
  • To investigate the effects of LiF and AlF3 dual modification on LiNi0.5Mn1.5O4.

Main Methods:

  • Solid-state synthesis of LiNi0.5Mn1.5O4 modified with LiF and AlF3.
  • Electrochemical performance testing including capacity, rate capability, and cycling stability.
  • Structural analysis using operando X-ray absorption spectroscopy (XAS) and synchrotron X-ray diffraction (SXRD).

Main Results:

  • The dual modification effectively suppressed the rock-salt phase formation, enhancing structural stability.
  • Optimized LiNi0.5Mn1.5O4 achieved high reversible capacities and near-complete delithiation/lithiation.
  • Full cells demonstrated excellent cycling performance, retaining 80% capacity after 200 cycles at 0.5C.

Conclusions:

  • Synergistic LiF and AlF3 modification significantly improves the electrochemical performance of LiNi0.5Mn1.5O4.
  • The enhanced material exhibits potential for high-power lithium-ion battery applications.
  • This approach offers a viable strategy for developing advanced cathode materials with improved durability.