Application notes 15 min read

Interpretation problems of impedance measurements on time variant systems – Battery & Corrosion – Application Note 55

Latest updated: August 31, 2021

Abstract

Electrochemical systems like a battery in operation or a corroding electrode are rarely time-invariant. Impedance graphs obtained on time-variant systems can often mislead to a wrong interpretation and analysis when using the equivalent electrical circuit. This application note describes two examples of such a mislead interpretation using a commonly used electrical equivalent circuit with a variable resistor.

 

Introduction

The application note #9 [1] deals with impedance measurements performed on linear (and non-linear) time-invariant systems. Electrochemical systems like a battery in operation or a corroding electrode are rarely time-invariant. Impedance graphs obtained on time-variant systems can often mislead to a wrong interpretation and analysis when using the equivalent electrical circuit. This application note describes two examples of such a mislead interpretation using a commonly used electrical equivalent circuit with a variable resistor

 

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