Volume Change from Materials to Cell Level and Its Influence on Battery Lifetime - (PPT)

摘要

Volume change by intercalation on crystal level has an significant impact on: - Forces in electrode and between electrode and current collector; - Thickness change of electrodes and cells, even inhomogeneous. Volume is also increased by temperature and by Li-plating. Inhomogeneous compression, as seen in cylindrical cells, result in inhomogeneous Li-plating inside the cell. Li-plating starts first in areas with higher compression. Volume change can be represented by simplified Electrode models. Inhomogeneous current distribution results in inhomogeneous SoC, followed by inhomogeneous volume change and mechanical stress.