The effects of elastic stiffening on the evolution of the stress field within a spherical electrode particle of lithium-ion batteries

Wenbin Zhou, Feng Hao, Daining Fang

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Poor cyclic performance of lithium-ion batteries is calling for efforts to study its capacity attenuation mechanism. The internal stress field produced in the lithium-ion battery during its charging and discharging process is a major factor for its capacity attenuation, research on it appears especially important. We established an electrochemical -mechanical coupling model with the consideration of the influence of elastic stiffening on diffusion for graphite anode materials. The results show that the inner stress field strongly depends on the lithium-ion concentration field, greater concentration gradients lead to greater stresses. The evolution of the stress field is similar to that of the concentration gradient but lags behind it, which shows hysteresis phenomenon. Elastic stiffening can lower the concentration gradient and increase elastic modulus, which are two major factors influencing the inner stress field. We conclude that the latter is more dominant compared to the former, and elastic stiffening acts to increasing the internal stress.

Original languageEnglish
Article number1350040
JournalInternational Journal of Applied Mechanics
Volume5
Issue number4
DOIs
Publication statusPublished - 20 Nov 2013

Keywords

  • concentration gradient
  • elastic stiffening
  • Lithium-ion battery
  • stress field

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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