63487 2025 eng lecture 0 -- -- -- Lithium-ion batteries (LIBs) are central to modern energy storage technologies, powering applications from portable electronics to electric vehicles and grid storage systems. Their popularity comes from their high energy density, efficiency, and extended cycle life. However, over time, various aging mechanisms lead to capacity loss, increased internal resistance, and, ultimately, battery failure. Understanding and predicting these aging processes is crucial for enhancing the reliability and longevity of LIBs. This necessity makes the development of advanced diagnostic tools essential. This study uses plasma-based spectrometry techniques to explore lithium isotope fractionation (LIF) as a predictive tool for monitoring LIB aging and degradation. Mass spectrometric techniques —including MC-ICP-MS, LA-ICP-MS, and MICAP-MS— were employed to analyze lithium isotopic composition in both new and aged lithium cobalt oxide (LCO) cells, including lab-made coin cells and commercial batteries. An isotopic fractionation was identified during electrochemical cycling: 6Li migrates towards the anode, while 7Li accumulates in the cathode. These isotopic patterns correlate with structural degradation, including solid electrolyte interphase (SEI) growth and crack formation, as confirmed by FIB-SEM, XANES, and EXAFS analyses. This correlation demonstrates that LIF aligns with key aging mechanisms in model coin cells and commercial batteries, such as capacity fade and impedance growth. LIF provides a powerful diagnostic tool for battery health monitoring and aging prediction by linking isotopic fractionation to structural degradation. This approach offers significant potential to extend battery lifespan and improve the reliability of energy storage systems. ANAKON 2025 Leipzig, Germany 10.03.2025 13.03.2025 0 publish false true Carlos Enrique Abad Andrade eng uncontrolled Isotope eng uncontrolled Lithium eng uncontrolled Battery aging eng uncontrolled Degradation eng uncontrolled Fractionation eng uncontrolled Battery Analytische Chemie Angewandte Physik 1 Analytische Chemie; Referenzmaterialien 1.1 Anorganische Spurenanalytik 1.6 Anorganische Referenzmaterialien und Gasanalytik Energie Elektrische Energiespeicher und -umwandlung Chemie und Prozesstechnik Chemische Charakterisierung und Spurenanalytik Datei im Netzwerk der BAM verfügbar ("Closed Access") Präsentation