This article aims to describe the most important aspects to consider when using the concept of internal impedance in algorithms that focus on characterizing the degradation of lithium-ion (Li-ion) batteries. The first part of the article provides a literature review that will help the reader understand the concept of electrochemical impedance spectroscopy (EIS) and how Li-ion batteries can be represented through electrochemical or empirical models, in order to interpret the outcome of typical discharge and/or degradation tests on Li-ion batteries. The second part of the manuscript shows the obtained results of an accelerated degradation experiment performed under controlled conditions on a Li-ion cell. Results show that changes observed on the EIS test can be linked to battery degradation. This knowledge may be of great value when implementing algorithms aimed to predict the End-of-Life (EoL) of the battery in terms of temperature, voltage, and discharge current measurements. The purpose of this article is to introduce the reader to several types of Li-ion battery models, and show how the internal impedance of a Li-ion battery is a dynamic parameter that depends on different factors; and then, illustrate how the EIS can be used to obtain an equivalent circuit model and how the different electronic components vary with the use given to the battery.
A partir de la concepción de que la extensión universitaria constituye un pilar conceptual e ideológico de la Universidad Reformista junto a la enseñanza y la investigación, se desarrollan prácticas que vinculan las investigaciones sobre etnobotánica aplicada con la tarea docente en Botánica Aplicada y su transferencia a la resolución de problemas cotidianos. Se presentan los resultados de una experiencia destinada a niños y jóvenes que están sometidos a internación hospitalaria que, a través del juego, vincula vegetales de uso habitual con los saberes vigentes en distintos ámbitos.
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