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Updated: Jun 10, 2025

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
Published on: September 12, 2018
Modelling and analysis of polarisation characteristics in lithium insertion electrodes considering charge transfer
Kingo Ariyoshi1, Yuma Nagashima1
1Department of Chemistry and Bioengineering, Graduate School of Engineering, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585, Japan. ariyoshi@omu.ac.jp.
Abstract:
The polarisation behaviour of Li[Li0.1Al0.1Mn1.8]O4 (LAMO) electrodes is influenced by charge transfer resistance (Rct) and contact resistance (Rcont). In this study, using symmetric LAMO/LAMO cells, we find that polarisation curves shift from exponential (Tafel-like) to linear (Ohm's law-like) as Rct decreases relative to Rcont, particularly at lower temperatures and higher frequencies. A new polarisation equation, based on an equivalent circuit model, explains the transition from exponential to linear polarisation curves observed in experiments. Our results indicate that reducing Rcont is more crucial than Rct for improving electrode power capability.
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