Quantifying the Impact of Overdischarge on Large Format Lithium-Ion Cells
While the gas generation behavior of lithium-ion cells has been studied extensively, a methodology for assessing the gas generation prior to full thermal runaway has not been developed. It has been demonstrated that oxygen can be released from the electrode structure due to a destabilization of the crystal lattice. Additionally, electrolyte decomposition, typically during charging, contributes to gas buildup within the cell that can eventually cause rupturing of the casing. We discuss methods for assessing the amount of gas generated at intermediate stages of cell abuse. Finally, we present recent data on the safety implications of copper dissolution in overdischarged large format cells.
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