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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Heterogeneous Solid Electrolyte Interphase Interactions Dictate Interface Instability in Sodium Metal Electrodes.

Aditya Singla1, Kaustubh G Naik1, Bairav S Vishnugopi1

  • 1School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 30, 2024
PubMed
Summary
This summary is machine-generated.

Sodium metal batteries face challenges like dendrite growth. This study reveals how solid electrolyte interphase (SEI) heterogeneities cause mechanical stress, leading to SEI failure and unstable sodium metal plating.

Keywords:
Na morphologySEI failureelectro‐chemo‐mechanical heterogeneitiesfilament growthnonuniform stressessolid electrolyte interphase

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Mechanical Engineering

Background:

  • Sodium (Na) metal batteries are promising due to Na's low cost and abundance.
  • Key challenges include dendrite growth, solid electrolyte interphase (SEI) fracture, and low Coulombic efficiency, hindering advancement.

Purpose of the Study:

  • To investigate the coupled electro-chemo-mechanical interactions at the Na/electrolyte interface.
  • To understand how SEI heterogeneities influence Na electrodeposition stability and morphological evolution.

Main Methods:

  • Analysis of coupled electro-chemo-mechanical interactions.
  • Examination of SEI heterogeneities and their impact on transport and reaction kinetics.
  • Comparative study of SEI failure in Na and lithium (Li) metal anodes.

Main Results:

  • SEI heterogeneities create current and stress hotspots during Na plating.
  • Heterogeneity-induced Na evolution and stress distribution accelerate SEI failure.
  • Identified three failure mechanisms: mechanical, transport, and kinetic.

Conclusions:

  • SEI electrochemical and mechanical properties are critical for anode morphology and interface stability.
  • Delineates mechanistic stability regimes and failure modes for Na metal electrodes.
  • Provides guidelines for designing artificial SEI layers for stable Na metal batteries.