锂(药物)
开裂
电池(电)
降级(电信)
材料科学
锂离子电池
离子
粒子(生态学)
核工程
法律工程学
化学工程
复合材料
化学
热力学
物理
工程类
电气工程
心理学
地质学
有机化学
精神科
功率(物理)
海洋学
作者
Alexander Karger,Simon O’Kane,Marcel Rogge,Cedric Kirst,Jan Singer,Monica Marinescu,Gregory J. Offer,Andreas Jossen
标识
DOI:10.1149/1945-7111/ad76da
摘要
Degradation models are important tools for understanding and mitigating lithium-ion battery aging, yet a universal model that can predict degradation under all operating conditions remains elusive. One challenge is the coupled influence of calendar and cycle aging phases on degradation mechanisms, such as solid electrolyte interphase (SEI) formation. In this work, we identify and systematically compare three different SEI interaction theories found in the literature, and apply them to experimental degradation data from a commercial lithium-ion cell. In a step-by-step process, and after careful data selection, we show that SEI delamination without any cracking of the active particles, and SEI microcracking, where cycling only affects SEI growth during the cycle itself, are both unlikely candidates. Instead, the results indicate that upon cycling, both the SEI and the active particle crack, and we provide a simple, 4-parameter equation that can predict the particle crack rate. Contrary to the widely-accepted Paris’ law, the particle crack rate decreases with increasing cycles, potentially due to changing intercalation dynamics resulting from the increasing surface-to-volume ratio of the active particles. The proposed model predicts SEI formation accurately at different storage conditions, while simply adding the degradation from pure calendar and cycle aging underestimates the total degradation.
科研通智能强力驱动
Strongly Powered by AbleSci AI