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Batteries
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Proceedings Papers
ISTFA2024, ISTFA 2024: Tutorial Presentations from the 50th International Symposium for Testing and Failure Analysis, k1-k80, October 28–November 1, 2024,
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Presentation slides for the ISTFA 2024 Tutorial session “Correlative Microscopy: In-Situ AFM-in-SEM Introduction, Capabilities, and Case Studies Semiconductor Materials and Batteries.”
Proceedings Papers
ISTFA2022, ISTFA 2022: Conference Proceedings from the 48th International Symposium for Testing and Failure Analysis, 47-50, October 30–November 3, 2022,
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Despite modern battery management systems, rechargeable lithium-ion batteries can be subjected to varying levels of overdischarge during transport, storage and use in the field. While the general degradation risks associated with overdischarge are well documented, there are not widely accepted cell voltages at which the onset of such degradation processes occur. In this work, reference electrode testing is performed to study a variety of commercial lithium-ion cells during varying levels of overdischarge. Common trends between different types of lithium-ion cells are first identified, and the resulting implications are discussed.
Proceedings Papers
ISTFA2022, ISTFA 2022: Conference Proceedings from the 48th International Symposium for Testing and Failure Analysis, 51-57, October 30–November 3, 2022,
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Root cause failure analysis of lithium-ion batteries provides important feedback for cell design, manufacture, and use. As batteries are being produced with larger form factors and higher energy densities, failure analysis techniques must be adapted to characteristics of the specific batteries. This paper will discuss the significance of melted copper in lithium-ion battery cells that have experienced thermal runaway and how the interpretation of such evidence has evolved over time. Specialized testing techniques that may prove helpful in determining the root cause of battery failures will also be described.
Proceedings Papers
ISTFA2007, ISTFA 2007: Conference Proceedings from the 33rd International Symposium for Testing and Failure Analysis, 242-251, November 4–8, 2007,
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The purpose of this article is to lay out a scientific methodology for investigating lithium ion (Li-ion) product failures. The discussion provides possible causes for an overheating Li-ion cell failure and covers processes involved in preventing Li-ion incidents. Performing a scientific root cause failure analysis involves systematically performing the failure analysis, which is explained in detail, to eliminate branches from the fault tree and arrive at the root cause of a given failure. Statistical analysis of Li-ion cells is provided, along with a recall determination of issues in Li-ion cells. The article also presents snapshots from actual Li-ion investigations selected from hundreds of investigations that have been performed by the authors at Exponent as far back as 1995.