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On the Calendar Aging and Lithium Metal Deposition of Lithium-ion Batteries
Lithium-ion battery,calendar and cycle life,dQdV diagram,aging mechanism,Lithium metal deposition,
|Publication Year :||2019|
The impact of battery storage on battery aging is very important for battery cycle life estimation. At present, many scholars have studied that battery capacity will be lost during storage. However, only a few people discuss the battery cycle life after storage. Therefore, this study will explore the relationship between battery storage conditions and cycle life, the relevant mechanisms of aging, and discuss the lithium metal deposition behavior during battery cycling.
This study conducted a cyclic aging experiment on batteries for different storage time and storage temperatures. In the study, the aging mechanism was explored through the ICA method. It can be known from the experimental results that the longer the calendar of the NMC battery, the shorter the cycle life. When the battery is stored in a low-temperature environment, it can effectively slow down the cycle aging of the battery. According to the peak evolution of the dQdV pattern obtained from the experiment, the aging mechanism of the NMC battery cycle aging was LLI, LAMdePE and LAMdeNE. After the battery calendar, the LLI and LAMdePE mechanisms will become more apparent during battery cyclic aging. However, batteries stored in a low-temperature circumstance can alleviate the occurrence of aging mechanisms. Based on the experimental results, this study finds out the non-linear aging starting position of the NMC battery used in the experiment. The semi-empirical formula was successfully used to describe the cycle life of NMC batteries under different storage conditions.
According to the lithium metal deposition model, it is assumed that the negative electrode has irregular protrusions due to errors in the process. It can be found from the model that after a charge and discharge cycle of the lithium metal battery, lithium metal is deposited on the tip of the irregular protrusion. The cause of this phenomenon is an irregular geometry of the negative electrode surface, resulting in uneven distribution of the electrolyte electric field and the accumulation of electrolyte currents at the irregular raised tip during charging.
|Appears in Collections:||應用力學研究所|
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