Path-Dependent Ageing of Lithium-ion Batteries and Implications on the Ageing Assessment of Accelerated Ageing Tests

被引:5
|
作者
Rogge, Marcel [1 ]
Jossen, Andreas [1 ]
机构
[1] Tech Univ Munich, Chair Elect Energy Storage Technol, Sch Engn & Design, Munich, Germany
关键词
capacity difference analysis; degradation modes; electrochemistry; energy conversion; inhomogeneous lithium distribution; DEGRADATION MECHANISMS; CAPACITY RECOVERY; GRAPHITE ANODE; HIGH-POWER; CELLS; CALENDAR; MODEL; IMPACT;
D O I
10.1002/batt.202300313
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Path dependency in ageing of Lithium-ion batteries (LIBs) still needs to be fully understood, and gaps remain. For realistic operational scenarios that involve dynamic load profiles, understanding this path dependency is essential for effective monitoring and accurate modelling of LIBs-ageing. Our research investigates the impact of different ageing sequences on capacity reduction and resistance increase, key metrics for determining the state of health (SOH). Moreover, we argue that relying solely on SOH-based monitoring is insufficient for predicting the ongoing ageing trajectory. Our findings underscore that recent operational history influences subsequent degradation. This degradation is attributed to the emergence of uneven lithium distribution, which can both induce capacity recovery and amplify degradation during cycling phases. Such insights are particularly interesting for ageing studies where accelerated battery degradation is achieved through continuous cycling, a common approach in most cyclic ageing investigations. We demonstrate that capacity difference analysis (CDA) holds promise in tracking this unevenness and the potential for capacity restoration through re-homogenisation. In conclusion, our work highlights the importance of utilising advanced tools, such as CDA and degradation mode (DM) analysis, to ensure accurate conclusions are drawn in accelerated LIB-ageing experiments. Effect of path-dependent ageing: The sequential as well as the historical path dependency of Li-Ion battery ageing was shown experimentally. The path-dependent ageing and capacity recovery effects could be linked to inhomogeneous lithium distribution caused by continuous cycling. The state of health was found to be insufficient to consider those effects. Capacity difference analysis was found to be a helpful tool to track inhomogeneity.image
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页数:12
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