Potentiostatic intermittent titration technique for electrodes governed by diffusion and interfacial reaction

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

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

The potentiostatic intermittent titration technique (PITT) is one of the widely used methods for determining the diffusion coefficient in electrochemical materials, such as lithium diffusion in lithium-ion battery electrodes. The conventional PITT analysis neglects interfacial resistance and assumes the system is diffusion-controlled. For real electrode systems, however, surface reaction as well as diffusion may be rate-limiting. In this Article, we analyze PITT measurements for material systems with finite surface reaction rates. For small amplitude potential steps, we derive analytic solutions for the measured transient current associated with PITT, taking into account the effects of finite surface reaction rates. Using the analytic solutions, the diffusion coefficient, surface reaction rate, and the exchange current density can be determined simultaneously. An example of lithium diffusion in amorphous silicon thin-film electrodes is used to demonstrate the enhanced PITT approach.

Original languageEnglish
Pages (from-to)1472-1478
Number of pages7
JournalJournal of Physical Chemistry C
Volume116
Issue number1
DOIs
StatePublished - Jan 12 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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