Electrochemical stiffness in lithium-ion batteries

Hadi Tavassol, Elizabeth M.C. Jones, Nancy R. Sottos, Andrew A. Gewirth

Research output: Contribution to journalArticle

Abstract

Although lithium-ion batteries are ubiquitous in portable electronics, increased charge rate and discharge power are required for more demanding applications such as electric vehicles. The high-rate exchange of lithium ions required for more power and faster charging generates significant stresses and strains in the electrodes that ultimately lead to performance degradation. To date, electrochemically induced stresses and strains in battery electrodes have been studied only individually. Here, a new technique is developed to probe the chemomechanical response of electrodes by calculating the electrochemical stiffness via coordinated in situ stress and strain measurements. We show that dramatic changes in electrochemical stiffness occur due to the formation of different graphite-lithium intercalation compounds during cycling. Our analysis reveals that stress scales proportionally with the lithiation/delithiation rate and strain scales proportionally with capacity (and inversely with rate). Electrochemical stiffness measurements provide new insights into the origin of rate-dependent chemomechanical degradation and the evaluation of advanced battery electrodes.

Original languageEnglish (US)
Pages (from-to)1182-1188
Number of pages7
JournalNature Materials
Volume15
Issue number11
DOIs
StatePublished - Nov 1 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Electrochemical stiffness in lithium-ion batteries'. Together they form a unique fingerprint.

  • Cite this