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Engineering Multiscale Coupled Electron/Ion Transport in Battery Electrodes.

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Phase transitions in battery electrodes significantly impact performance by altering electron and ion transport resistances. Controlling these transitions is crucial for designing stable, high-performance rechargeable batteries.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Coupled electron/ion transport is fundamental to electrochemical processes like battery operation.
  • Equivalent electrical circuit models effectively represent complex transport and kinetics in electrodes.
  • Time-dependent phase transitions in dynamic electrochemical environments are critical design factors.

Purpose of the Study:

  • To review the role of phase transitions in battery electrode performance and stability.
  • To highlight how phase transitions influence extrinsic resistances (electron and ion transport).
  • To emphasize the need for rational design strategies to manage phase transitions.

Main Methods:

  • Literature review of analytical models and experimental findings on battery electrodes.
  • Analysis of extrinsic resistances (Re and Rion) arising from phase transitions.
  • Discussion of design principles for mitigating resistance accumulation.

Main Results:

  • Phase transitions can lead to divergent extrinsic resistances, impacting electrode kinetics.
  • Extrinsic resistances significantly affect electrochemical performance and long-term battery stability.
  • Suppression of accumulating extrinsic resistances is vital for practical rechargeable batteries.

Conclusions:

  • Battery electrode and cell design must explicitly consider the structural phase transitions of active materials.
  • Advanced fabrication techniques are needed for precise control over conductive frameworks, interphases, and molecular structures.
  • Rational design targeting phase transitions and material manipulation is key for future battery development.