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Understanding lithium-ion (Li+) desolvation is key for battery performance. This study reveals how solid electrolyte interphase (SEI) components influence Li+ desolvation and stability, guiding better battery design.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Desolvation of ions is critical for intercalation into electrode materials.
  • The influence of solid electrolyte interphase (SEI) components on Li+ desolvation is not well understood at the molecular level.
  • Accurate simulation of interfacial electronic interactions during desolvation is challenging.

Purpose of the Study:

  • To investigate Li+ desolvation and redox stability on common SEI components (LiF, Li2CO3, LEMC).
  • To understand the molecular-scale impacts of SEI components on Li+ desolvation.
  • To provide guidance for designing SEI chemistry for enhanced battery performance.

Main Methods:

  • Combined ab initio molecular dynamics (AIMD) and stepwise multisubphase space metadynamics.
  • Calculated desolvation energy barriers for different SEI species and stages.
  • Performed charge density and density of states calculations.

Main Results:

  • Desolvation energy barriers vary significantly with SEI species and desolvation stages.
  • Li+ vacancies within SEI components promote complete desolvation and charge transport.
  • Electrolyte redox stability is directly linked to the nature of SEI components.

Conclusions:

  • SEI chemistry significantly impacts Li+ desolvation, charge transport, and electrolyte redox stability.
  • The developed AIMD and metadynamics framework accurately models interfacial dynamics and energetics.
  • Findings offer fundamental insights for designing advanced SEI layers for batteries and other interfacial applications.