Automotive traction battery needs and the influence of mechanical degradation of insertion electrode particles

Mark W. Verbrugge, Yang Tse Cheng

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

We derive and implement analytic solutions for the description of insertion particles subject to cyclic surface concentration variations consistent with a periodic voltage excitation source applied to an insertion electrode wherein the overall resistance is dominated by that of solid-state diffusion within the electrode particles. The form of the analytic solution allows for a direct analogy to cyclic fatigue phenomena that have been examined in detail for structural materials over the past two centuries. We utilize the strain energy density to assess the potential for crack nucleation, and we show that while the shear stress is independent of the surface tension and surface modulus, the strain energy density, which drives particle fracture, is sensitive to the surface mechanics and therefore the particle radii. Specifically, the analysis implies that smaller particles are more stable relative to diffusion-induced decrepitation and cracking, consistent with experimental observations.

Original languageEnglish
Title of host publicationAdvanced Materials and Concepts for Energy Harvesting
Pages1-27
Number of pages27
Edition18
ISBN (Electronic)9781566777605
DOIs
StatePublished - 2009

Publication series

NameECS Transactions
Number18
Volume19
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

ASJC Scopus subject areas

  • General Engineering

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