Determination of suitable parameters for battery analysis by Electrochemical Impedance Spectroscopy
By Pulido, Yoana Fern
Published in Measurement
NULL
2017
Abstract
Abstract Electrochemical Impedance Spectroscopy (EIS) is one of the most powerful tools for the study of batteries. The applied {AC} current, range of frequency sweep, points per decade represented, length of the pause time after a change in the state of charge (SOC) and length of the pause time after a change in the ambient temperature must have suitable values to obtain useful results from {EIS} tests. A method to determine and optimize these parameters is presented in this paper. It is based on the limits imposed by the battery, the tests carried out, the instruments employed and the use of Kramers-Kronig relations. The method has been checked using two kinds of lithium batteries: a lithium iron phosphate (LFP) battery and a lithium cobalt oxide (LCO) battery.
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