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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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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Dynamics and morphology of solid electrolyte interphase (SEI).

Fabian Single1, Birger Horstmann, Arnulf Latz

  • 1German Aerospace Center (DLR), Institute of Engineering Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany. birger.horstmann@dlr.de.

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|June 22, 2016
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Summary
This summary is machine-generated.

We present a new theory for porous solid electrolyte interphase (SEI) formation on lithium ion battery anodes, revealing non-zero porosity and dual-layer structures. Our model accurately predicts SEI evolution and morphology dependence on transport properties.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Battery Technology

Background:

  • Current solid electrolyte interphase (SEI) studies often assume homogeneous morphology and single transport mechanisms.
  • Understanding SEI formation is crucial for lithium-ion battery performance and longevity.

Purpose of the Study:

  • To develop a novel theory for continuous electrochemical formation of porous SEI films.
  • To investigate SEI porosity and morphology in a spatially resolved manner.
  • To model SEI formation considering multiple transport mechanisms.

Main Methods:

  • Development of a new theoretical framework for SEI electrochemical formation.
  • Incorporation of two distinct transport mechanisms into the model.
  • Spatially resolved tracking of SEI porosity and morphology.
  • Validation of SEI thickness evolution with experimental data.

Main Results:

  • The theory predicts a non-zero SEI porosity, deviating from homogeneous models.
  • SEI morphology is shown to be dependent on transport properties.
  • Dual-layer chemistry and morphology within the SEI are captured.
  • SEI thickness evolution aligns with existing experimental studies.

Conclusions:

  • The developed theory provides an unprecedented and consistent approach to SEI modeling.
  • The model successfully predicts key SEI properties, including porosity and dual-layer characteristics.
  • Analytic expressions derived offer insights into parameter dependencies for SEI properties.