4.7 Article

SoC dependent kinetic parameters of insertion electrodes from staircase - GITT

Journal

JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 767, Issue -, Pages 18-23

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2016.02.013

Keywords

Battery; Butler-Volmer; Charge Transfer; Kinetics; GITT

Funding

  1. German Federal Ministry of Education and Research BMBF through the Excellent - Battery WING center Batteries - Mobility in Saxony [KZ 03X4637 D]

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A staircase galvanostatic intermittent titration technique (SC-GITT) is introduced and exemplarily examined using the well-known half-cell reaction, LiCoO2 vertical bar Li. SC-GITT expands the common GITT and complements the number of accessible kinetic parameters by the ohmic resistance, the exchange current density and the charge transfer coefficient. In contrast to conventional GITT, the magnitude of the applied current is rapidly varied in a staircase like manner previously to the actual titration step. The overpotentials obtained within the staircase regime are fitted to a modified Butler-Volmer equation to determine the kinetic parameters. In the case of LiCoO2, the results reveal a significant lithium concentration dependence of the charge transfer kinetics and the ohmic resistance. The proposed experimental technique appears to be well suited for the investigation of electrochemical kinetics for all kinds of insertion electrodes. (C) 2016 Elsevier B.V. All rights reserved.

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