开路电压
电极
电压
锂(药物)
离子
材料科学
电气工程
锂离子电池
电池(电)
化学
工程类
物理
热力学
医学
功率(物理)
有机化学
物理化学
内分泌学
作者
Cedric Kirst,Alexander Karger,Jan Singer,Andreas Jossen
标识
DOI:10.1016/j.jpowsour.2024.234341
摘要
In this publication we extend a state-of-the-art electrode open circuit potential model for blend electrodes and inhomogeneous lithiation. We introduce a bi-level optimization algorithm to estimate the open parameters of the electrode model using measurements conducted on the full-cell level with state-of-the-art testing equipment. As input for the optimization algorithm, we use data from a pseudo open-circuit voltage aging study to estimate the electrode potential curves, the electrode capacities, and the capacity of cyclable lithium over lifetime without opening the cell. We validate our method against measurements on commercial lithium-ion cells with the electrode materials LFP-C, NMC-SiC and NCA-SiC, and compare the estimated electrode pseudo open-circuit potential curves to measurements conducted on harvested half-cells. We conclude that the presented non-destructive method of half-cell open-circuit potential modeling offers an alternative to complex cell disassembly and electrode material harvesting for degradation mode analysis.
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