Potentiostatic intermittent titration technique (PITT) for spherical particles with finite interfacial kinetics

Juchuan Li, Fuqian Yang, Xingcheng Xiao, Mark W. Verbrugge, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The potentiostatic intermittent titration technique (PITT) is an electroanalytical method that has been widely used to study diffusion of solutes (such as lithium) in electrode materials. Here, we extend the conventional PITT method to account for finite interfacial reaction kinetics and derive analytic equations for electric current under PITT operations. Using the modified PITT, the lithium diffusion coefficient in host materials and the interfacial reaction kinetics can be determined simultaneously. We demonstrate this modified PITT by an example of lithium diffusion in graphite (mesocarbon microbeads, MCMB) and show the improvements of the modified PITT theory over the conventional PITT for investigating the kinetics of electrodes comprising spherical particles.

Original languageEnglish
Pages (from-to)56-61
Number of pages6
JournalElectrochimica Acta
Volume75
DOIs
StatePublished - Jul 30 2012

Bibliographical note

Funding Information:
Financial support from NSF (CMMI # 1000726 ) and General Motors R&D Center is greatly acknowledged.

Keywords

  • Diffusion coefficient
  • Graphite (MCMB)
  • Interfacial kinetics
  • Lithium-ion battery
  • Potentiostatic intermittent titration technique (PITT)
  • Spherical particles
  • Surface reaction

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Electrochemistry

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