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Jonathan M Larson1, Eleanor Gillette2, Kristen Burson1

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A new technique called pascalammetry measures stress in solid-state batteries by analyzing current changes. This method detects stress-assisted ion diffusion, offering early warnings of battery degradation.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Elucidating ion transport in energy storage devices is crucial.
  • Existing techniques have limitations in assessing ion transport under various conditions and scales.

Purpose of the Study:

  • Introduce a novel technique, pascalammetry, for studying ion transport in solid-state electrochemical systems.
  • Develop a method to detect and quantify stress in solid-state batteries.

Main Methods:

  • Applied stress to solid-state electrochemical devices and measured induced faradaic current transients.
  • Performed stress-step pascalammetry on operando microbattery probes (Li2O/Li/W) and silicon cathodes.
  • Developed an analytical solution to a diffusion/activation equation to model stress signatures.

Main Results:

  • Revealed stress-assisted Li+ diffusion in microbattery probes and Si cathodes.
  • Demonstrated that non-Cottrellian lithium diffusional kinetics indicates stress, a precursor to battery degradation.
  • Identified unique spatiotemporal characteristics of the stress signature, distinct from unstressed systems.

Conclusions:

  • Pascalammetry provides a powerful new approach to study stress-related phenomena in solid-state electrochemical systems.
  • Offers an unprecedented opportunity for quantitative detection of stress in solid-state batteries via current signatures.
  • The technique can serve as an early warning system for potential battery degradation.