Verification of Low-impedance EIS Using a 1 mΩ Resistor

2015-05-22 16:28 下载量：5

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Electrochemical Impedance Spectroscopy (EIS) is a powerful way to gain information about electrochemical systems, often applied to new electrochemical devices used for energy-conversion and storage (ECS), including batteries, fuel cells, and super-capacitors. EIS can be used in all stages of the development of new devices, from initial evaluation of half-cell reaction mechanisms and kinetics, to quality-control of packaged batteries. Increased use of ECS devices in higher power applications (such as electric vehicles) has led to development of devices having very low impedance. Unfortunately for practitioners of EIS, impedance of modern ECS devices is often so low that it often cannot be measured using laboratory EIS systems. Most commercial EIS systems do not work well when impedance is below 0.1 W. This application note describes a series of EIS measurements made on a 1mW surface-mount resistor. The very small dimensions of this resistor minimized cable-related inductance errors. The measurements verify that a Gamry Instruments system can accurately measure this low impedance. The techniques used to make these measurements and post-experiment corrections can be used to verify the performance of any low-impedance EIS system. Experimental guidelines presented here should be helpful when testing physically larger ECS devices. Many of the problems encountered in testing a small resistor also occur in testing a battery or fuel cell. If you are new to EIS, we suggest that you read Gamry Instruments’ Basics of EIS before reviewing the rest of this application note. See the App. Note section on www.gamry.com. Information found in that introduction to EIS is not repeated here.

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