Stress evolution and capacity fade in constrained lithium-ion pouch cells

John Cannarella, Craig B. Arnold

Research output: Contribution to journalArticlepeer-review

201 Scopus citations

Abstract

The effects of mechanical stress on lithium-ion battery life are investigated by monitoring the stack pressure and capacity of constrained commercial lithium-ion pouch cells during cycling. Stack stress is found to be a dynamic quantity, fluctuating with charge/discharge and gradually increasing irreversibly over long times with cycling. Variations in initial stack pressure, an important controllable manufacturing parameter, are shown to produce different stress evolution characteristics over the lifetime of the cells. Cells manufactured with higher levels of stack pressure are found to exhibit shorter cycle lives, although small amounts of stack pressure lead to increased capacity retention over unconstrained cells. Postmortem analysis of these cells suggests a coupling between mechanics and electrochemistry in which higher levels of mechanical stress lead to higher rates of chemical degradation, while layer delamination is responsible for the capacity fade in unconstrained cells. Localized separator deformation resulting in nonuniform lithium transport is also observed in all cells.

Original languageEnglish (US)
Pages (from-to)745-751
Number of pages7
JournalJournal of Power Sources
Volume245
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Capacity fade
  • Cell aging
  • Cycle life
  • Lithium-ion battery
  • Mechanical stress
  • Surface film

Fingerprint Dive into the research topics of 'Stress evolution and capacity fade in constrained lithium-ion pouch cells'. Together they form a unique fingerprint.

Cite this