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First-principles study on small polaron and Li diffusion in layered LiCoO.

Seryung Ahn1, Jiyeon Kim2,3, Bongjae Kim1,4

  • 1Department of Physics, Kyungpook National University, Daegu 41566, South Korea.

Physical Chemistry Chemical Physics : PCCP
|October 10, 2023
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Summary
This summary is machine-generated.

Local magnetism in lithium cobalt oxide stabilizes polarons, hindering lithium-ion diffusion. However, magnetic ordering is energetically favorable, suggesting a polaron migration mechanism for ion transport in batteries.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Lithium-ion (Li-ion) conductivity is critical for cathode material performance in Li-ion batteries.
  • Understanding Li-ion diffusion mechanisms is essential for designing high-performance batteries.

Purpose of the Study:

  • To investigate the role of magnetic ordering on polaron stability and Li-ion diffusion in layered LiCoO2.
  • To elucidate the mechanism of Li-ion diffusion, particularly the contribution of polarons.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Analysis of polaron stability and Li-ion diffusion barriers under various magnetic configurations.

Main Results:

  • Local magnetism in LiCoO2 promotes localized Co4+ polarons, increasing the Li-ion diffusion barrier to ~0.34 eV.
  • Polaron migration occurs in the opposite direction to Li-ion movement.
  • Non-magnetic structures exhibit lower Li-ion diffusion barriers (~0.21 eV) but are less energetically stable.

Conclusions:

  • The study advocates for a hole polaron migration scenario in Li-ion diffusion.
  • Strong electron correlation in Cobalt (Co) ions is crucial for stabilizing the Co4+ polaron.
  • Despite increased diffusion barriers, magnetically ordered structures are favored, highlighting the complex interplay between magnetism and ion transport.