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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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Probing the morphological influence on solid electrolyte interphase and impedance response in intercalation

Chien-Fan Chen1, Partha P Mukherjee

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Physical Chemistry Chemical Physics : PCCP
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Solid electrolyte interphase (SEI) formation degrades lithium-ion battery performance. This study introduces a model linking electrode microstructure and particle morphology to SEI growth and impedance, improving battery design.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Solid electrolyte interphase (SEI) formation is a primary cause of performance degradation in lithium-ion batteries.
  • Electrode microstructure and active particle morphology significantly influence SEI growth and interfacial impedance.
  • Electrochemical impedance spectroscopy (EIS) can infer resistance changes related to SEI thickness.

Purpose of the Study:

  • To develop a microstructure-aware impedance model for predicting the impact of electrode architecture on battery impedance response.
  • To analyze how active particle morphology and electrode composition affect SEI formation and electrochemical behavior.
  • To elucidate the interdependencies between interfacial and transport resistance modes in lithium-ion batteries.

Main Methods:

  • Development of a novel microstructure-aware impedance model.
  • Simulation of various electrode microstructures with compositional variations.
  • Analysis of SEI formation influenced by active material morphology, particle size, binder, and electrolyte fractions.

Main Results:

  • The proposed model successfully predicts the influence of active particle morphology on SEI formation and impedance characteristics.
  • Demonstrated critical effects of active material morphology, mean particle size, binder, and electrolyte volume fractions on SEI behavior.
  • Identified key interdependencies between interfacial and transport resistance modes.

Conclusions:

  • Electrode microstructure and active particle morphology are critical factors governing SEI formation and battery impedance.
  • The microstructure-aware impedance model provides valuable insights for optimizing electrode design to mitigate SEI-related performance decay.
  • Understanding these microstructural influences is essential for developing next-generation lithium-ion batteries with enhanced longevity and performance.