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Dear Colleagues,

Energy materials are essential in our modern world and are expected to have useful lifetimes that range from 25 to over 50 years. The need for long lifetimes and large investments are barriers that new energy producing technologies must surmount to provide a substantial proportion of global energy. This has motivated many researchers to focus on the science of degradation and evolution of energy materials. Green and everlasting energy materials have also received increasing attention as regards the development of sustainable energy systems. In order to develop these energy materials, the degradation and evolution characteristics of energy materials should be identified, and diagnostic and prognostic methods to elucidate degradation or evolution mechanisms should be studied. Novel sensing technologies also help toward the real-time monitoring degradation of energy materials. This Special Issue aims to collect original research and review articles that report results focused on the degradation and evolution of energy materials for green and sustainable energy systems. Potential topics include but are not limited to the following:

Degradation and evolution characteristics of energy materials;
Diagnostic and prognostic methods for energy materials;
Experimental methods for characterizing degradation and evolution;
Advanced methods to mitigate concerns on degradation of energy materials;
Fatigue, corrosion, and wear in energy materials;
Novel damage accumulated models;
Environmental and operational effects on degradation;
Novel sensing technologies for health monitoring.

Prof. Dr. Ki-Yong Oh
Prof. Dr. Kyungwho Choi
Guest Editors

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Keywords

degradation
evolution characteristics
energy materials
diagnostics and prognostics
fatigue, corrosion, and wear
health monitoring

Published Papers (2 papers)

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Research

Open AccessArticle

Automotive Diesel Fuel Internal Stability Testing with the Use of UV and Temperature as Degradation Factors

Michal Borecki

Mateusz Geca

and

Michael L. Korwin-Pawlowski

Materials 2022, 15(23), 8548; https://doi.org/10.3390/ma15238548 - 30 Nov 2022

Cited by 2 | Viewed by 875

Abstract

Diesel fuel stability can be considered from many points of view, of which the two considered most important are stability in contact with the environment and internal stability. Fuel stability in touch with the environment is often defined as oxidation stability, of which measurement procedures are well developed. The presented paper shows that fuel’s internal stability can also be important. The internal stability of diesel fuel with the local use of thermal and ultraviolet radiation (UV) as degradation factors and fluorescence signals as a probe is presented in this paper. We show that the internal degradation of fuel with temperature use differs from that with UV and simultaneous both factors use. Our study shows that using temperature as a degradation factor introduces significant fluorescence fading. Moreover, the fluorescence signal restores significantly later than the sample stabilizes at room temperature. The novelty proposed based on examination is hybrid degradation and an examination cycle that enables the simultaneous use of degradation factors and fluorescence reading. For this purpose, a dedicated measurement setup of signal control and processing was constructed and programmed. The measurement procedure of the data series for specific wavelength enables calculation of signal shifts that allow the internal stability classification of diesel fuel samples in less than 30 min with the cost of a single disposable capillary probe and one polymer plug. Premium and regular fuel examination results show that internal fuel stability can be related to polycyclic aromatic hydrocarbons (PAH) concentrations and can be modified with dedicated additives. Full article

(This article belongs to the Special Issue Degradation and Evolution of Energy Materials)

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Open AccessArticle

Influence of Mechanical Fatigue at Different States of Charge on Pouch-Type Li-Ion Batteries

and

Materials 2022, 15(16), 5557; https://doi.org/10.3390/ma15165557 - 12 Aug 2022

Viewed by 708

Abstract

Since flexible devices are being used in various states of charge (SoCs), it is important to investigate SoCs that are durable against external mechanical deformations. In this study, the effects of a mechanical fatigue test under various initial SoCs of batteries were investigated. More specifically, ultrathin pouch-type Li-ion polymer batteries with different initial SoCs were subjected to repeated torsional stress and then galvanostatically cycled 200 times. The cycle performance of the cells after the mechanical test was compared to investigate the effect of the initial SoCs. Electrochemical impedance spectroscopy was employed to analyze the interfacial resistance changes of the anode and cathode in the cycled cells. When the initial SoC was at 70% before mechanical deformation, both electrodes well maintained their initial state during the mechanical fatigue test and the cell capacity was well retained during the cycling test. This indicates that the cells could well endure mechanical fatigue stress when both electrodes had moderate lithiation states. With initial SoCs at 0% and 100%, the batteries subjected to the mechanical test exhibited relatively drastic capacity fading. This indicates that the cells are vulnerable to mechanical fatigue stress when both electrodes have high lithiation states. Furthermore, it is noted that the stress accumulated inside the batteries caused by mechanical fatigue can act as an accelerated degradation factor during cycling. Full article

(This article belongs to the Special Issue Degradation and Evolution of Energy Materials)

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