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Performance characterization of lithium-ion battery cells within restricted operating range using an extended ragone plot

Sven Wiegelmann, Astrid Bensmann and Richard Hanke-Rauschenbach

Applied Energy, 2025, vol. 389, issue C, No S0306261925004349

Abstract: Lithium-ion battery systems play a crucial role in applications ranging from electric vehicles to grid storage, but their performance can vary significantly under different operating conditions. While extensive research has explored the non-linear relationship of the battery’s key performance metrics – energy and power – across the manufacturers’ permissible limits, the impacts of operating in a restricted range have not yet been sufficiently investigated. Restricting the available operating range, particularly the upper voltage limit, may be advantageous or even necessary for specific applications with harsh environmental conditions, potentially enhancing safety, efficiency, compatibility, and lifespan without substantially compromising performance. In order to investigate this trade-off, the power-based performance of three battery cells with different formats and chemistries is experimentally characterized and analyzed using an extended Ragone plot. To reduce experimental effort, we demonstrate a reconstruction-based approach to recalculate the Ragone plot for arbitrary voltage initialization limits by trimming the full-range dataset based on the preceding charge termination conditions. In the practically relevant range, deviations between the measured and reconstructed Ragone curves remain within ≤3%, validated by an electrical and thermal assessment. By superimposing upper and lower operating limits, the extended Ragone plot enables an evaluation of battery performance under a restricted range without additional cell characterization measurements. Our findings thus provide a practical and efficient method for engineers and researchers, ideally supporting the decision-making in selecting, designing, or managing battery systems for application-specific energy storage solutions.

Keywords: Lithium-ion battery; Performance characterization; Restricted operating range; Extended Ragone plot; Polarization plot (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1016/j.apenergy.2025.125704

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