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The Electrical Double Layer01:30

The Electrical Double Layer

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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Multiscale Modeling of Solid Electrolyte Interphase Formation on Oxygen-Functionalized Graphite Anodes for

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Surface functionalization of graphite anodes accelerates solid electrolyte interphase (SEI) formation in lithium-ion batteries. This strategy creates stable SEI layers, enhancing ionic conductivity and battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • The solid electrolyte interphase (SEI) is critical for lithium-ion battery (LIB) performance but its formation is complex.
  • Limited understanding of SEI mechanisms hinders rational design of high-performance LIBs.

Purpose of the Study:

  • To elucidate the atomistic mechanisms of SEI formation on graphite anodes.
  • To investigate the impact of surface functionalization on SEI growth kinetics and properties.

Main Methods:

  • Integrated multiscale simulation framework: Density Functional Theory (DFT) and Molecular Dynamics (MD).
  • REACTer protocol with topology-mapped reaction templates and physics-informed constraints.
  • Simulations on pristine and functionalized (O-, OH-, O/OH-terminated) graphite anodes.

Main Results:

  • Identified three-stage SEI growth kinetics (initial, transition, steady-state) on functionalized surfaces.
  • OH-terminated surfaces promote thin, dense inorganic/organic composite SEI layers, suppressing component dissolution.
  • Optimized SEI exhibits enhanced ionic conductivity and favorable viscosity.

Conclusions:

  • Electrode surface functionalization is a viable strategy for controlling SEI formation.
  • Fundamental principles for designing advanced battery interfaces are provided.