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Fictitious phase separation in Li layered oxides driven by electro-autocatalysis.

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Apparent phase separation in lithium-ion battery electrodes is a dynamic artifact, not a true phase transition. This effect arises from autocatalytic reactions, influencing battery performance and stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Layered oxides are crucial lithium-ion battery electrodes, typically operated within single-phase composition ranges to avoid phase transitions.
  • Operando diffraction studies have indicated phase separation during delithiation in porous electrodes, but this observation is inconsistent and not seen during lithiation.

Purpose of the Study:

  • To investigate the anomalies observed in layered oxide electrodes during cycling, specifically the apparent phase separation during delithiation.
  • To propose and validate a new model explaining these phenomena as a dynamical artifact rather than a true phase transition.

Main Methods:

  • Experimental validation using the single-phase material Liₓ(Ni₁/₃Mn₁/₃Co₁/₃)O₂ (0.5 < x < 1).
  • Utilizing operando diffraction and nanoscale oxidation-state mapping.
  • Employing a population-dynamics model driven by autocatalytic electrochemical reactions.

Main Results:

  • Demonstrated that apparent phase separation is a dynamical artifact caused by autocatalytic electrochemical reactions, where interfacial exchange current increases with delithiation.
  • Validated the population-dynamics model experimentally, showing consistency across different transition-metal compositions.
  • Confirmed that this fictitious phase separation is a repeatable non-equilibrium effect.

Conclusions:

  • The study reveals that apparent phase separation in layered oxide electrodes is a dynamical artifact driven by electro-autocatalysis, not a material phase transition.
  • Highlights the critical role of population dynamics and non-equilibrium effects in battery electrode behavior.
  • Provides a new framework for understanding and potentially controlling ensemble stability in battery materials.