Multi-analytical characterization of temperature dependent aging mechanisms in commercial Lithium-ion batteries with Si/graphite anodes

Author:

Jihed Ayari

Other authors:

Institution/company:

Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU)

The performance and longevity of lithium-ion batteries (LIBs) are significantly influenced by operating conditions such as C-rate and voltage range during cycling. This study investigates the aging mechanisms of LIBs under high-stress conditions, with a specific focus on the differences between aging at high and low C-rates across varying voltage ranges. Using a combination of Arrhenius analysis and advanced characterization techniques: focused ion beam (FIB) milling, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR). We examine the effects of these cycling conditions on the electrochemical performance and surface reactions of the anode materials. This multi-technique approach offers a comprehensive understanding of how different operational parameters impact the electrochemical and chemical stability of LIBs, and how aging alters the main aging mechanisms in cells with Si/graphite anodes. These findings are crucial for optimizing battery performance and extending cycle life through the effective management of temperature, C-rate, and voltage limits.

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Datum_Uhrzeit	Session	Title	Autor	Company	Category
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Multi-analytical characterization of temperature dependent aging mechanisms in commercial Lithium-ion batteries with Si/graphite anodes

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HDT (Haus der Technik e. V.)

HDT (Haus der Technik e. V.)