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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Grain Boundary-Driven Lattice Dynamics in a Solid-State Li-Ion Conductor.

Jack M Hemingway1, James A Quirk1, Erli Lu2

  • 1Chemistry - School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon Tyne, UK.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

Grain boundaries (GBs) in solid electrolytes hinder lithium-ion transport due to vibrational hardening. Anion sublattice softening at GBs may cause degradation, impacting battery performance.

Keywords:
Li‐ion transportgrain boundarieslattice dynamicsphonons

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Grain boundaries (GBs) are critical in polycrystalline solid electrolytes, influencing ionic conductivity, electronic properties, and stability.
  • The specific impact of GBs on lattice dynamics within solid electrolytes remains poorly understood.

Purpose of the Study:

  • To investigate the influence of GBs on lattice dynamics in solid electrolytes.
  • To explore the consequences of these dynamics for lithium-ion (Li-ion) transport and material stability.

Main Methods:

  • Utilized first-principles phonon calculations.
  • Focused on the GBs of an anti-perovskite Li3OCl model solid electrolyte.

Main Results:

  • Observed vibrational hardening of the Li-ion sublattice at GBs, indicating increased transport barriers.
  • Identified vibrational softening of the anion sublattice at GBs, potentially leading to side reactions and degradation.
  • Found poorer alignment between Li-ion migration pathways and vibrational eigenvectors at GBs compared to the bulk.

Conclusions:

  • Demonstrated a simulation approach for lattice dynamics at solid electrolyte GBs.
  • Established a link between bulk material phonon properties and GB resistance.
  • Highlighted the detrimental effects of GBs on Li-ion transport and solid electrolyte stability.