Issue 14, 2024

The origins of critical deformations in cylindrical silicon based Li-ion batteries

Abstract

A manifold of degradation mechanisms causes premature capacity fade of Li-ion batteries. To understand their origin, we need a detailed diagnosis of battery (mal-)function over time. Here we employ correlative neutron and X-ray imaging to observe microstructural changes over time inside high energy density cylindrical cells and focus on unraveling the causes of localized defects where the silicon–graphite anode becomes damaged. We discover that these defects are due to local silicon enrichments occurring during electrode wet process manufacturing. We identify a threshold defect size beyond which internal cell structure and functioning is compromised, indicating the need for rigorous electrode-slurry quality control to avoid agglomerations above 50 microns. Our study elucidates defect genesis and their criticality, providing opportunities to better predict and mitigate unwanted aging and failure modes.

Graphical abstract: The origins of critical deformations in cylindrical silicon based Li-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
05 2月 2024
Accepted
29 4月 2024
First published
14 5月 2024
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2024,17, 5048-5059

The origins of critical deformations in cylindrical silicon based Li-ion batteries

E. Lübke, L. Helfen, P. Cook, M. Mirolo, V. Vinci, O. Korjus, B. Fuchsbichler, S. Koller, R. Brunner, J. Drnec and S. Lyonnard, Energy Environ. Sci., 2024, 17, 5048 DOI: 10.1039/D4EE00590B

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