Investigating changes in transport, kinetics and heat generation over NCA/Gr-SiOx battery lifetime

Wojtala, Malgorzata; Planella, Ferran Brosa; Zulke, Alana Aragon; Hoster, Harry E.; Howey, David A.

doi:10.1109/vppc55846.2022.10003425

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…The capacity loss of 10 % is nearly identical to the distance change of A2C2, resulting in LLI being the main driver of capacity loss in case of lower voltage levels. Similar results with only LLI as aging effect were also found by Keil et al [15] for a NCA/C 18650-cell and also by Wojtala et al [32,33] for exactly the cell used in this study.…”

Section: Aging According To Differential Voltage Analysissupporting

confidence: 91%

An Analysis of Calendaric Aging over 5 Years of Ni‐Rich 18650‐Cells with Si/C Anodes

Frie,

Ditler,

Klick

et al. 2024

ChemElectroChem

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Calendaric lifetime testing of lithium‐ion cells is time‐consuming and resource‐intensive. As Dubarry et al.[1] state, testing is often limited to a few aging conditions. This paper presents the results of a long‐term aging study on lithium‐ion cells with a nickel‐rich NCA cathode and a graphite‐silicon anode. 69 cells were stored at 5 different voltages and under 4 different temperatures for 5 years. Regular reference performance tests (RPT) provide insights for State of Health (SoH) calculation and further analysis through differential voltage analysis. The results are verified against post‐mortem analyses. The long aging period enables accurate determination of aging rates. Our results demonstrate that the storage voltage level strongly influences the degradation rate, with temperature playing a minor role. The identified aging effects include loss of active material on the cathode side and loss of lithium inventory. Initial degradation follows a ‐trajectory but is caused by overhang effects. The long‐term aging is rather linear.

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Section: Aging According To Differential Voltage Analysissupporting

confidence: 91%

An Analysis of Calendaric Aging over 5 Years of Ni‐Rich 18650‐Cells with Si/C Anodes

Frie,

Ditler,

Klick

et al. 2024

ChemElectroChem

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show abstract

“…The cells use NCA as positive, and a SiO/Gr-blend as negative active-material. [23,24] As in literature, different nominal capacities are mentioned between 3.35 Ah to 3.4 Ah, [25][26][27] we use 3.4 Ah as nominal capacity C N for charge amounts and current rates throughout this study to avoid any confusion. The cells are divided into three groups with six cells each, whereas one group represent one of three chosen sequential permutation of ageing paths.…”

Section: Experiments and Methodology Used Cells And Test-equipmentmentioning

confidence: 99%

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

Rogge,

Jossen

2023

Batteries & Supercaps

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Path dependency in ageing of Lithium‐Ion batteries 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.

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Investigating changes in transport, kinetics and heat generation over NCA/Gr-SiOx battery lifetime

Cited by 2 publications

References 17 publications

An Analysis of Calendaric Aging over 5 Years of Ni‐Rich 18650‐Cells with Si/C Anodes

An Analysis of Calendaric Aging over 5 Years of Ni‐Rich 18650‐Cells with Si/C Anodes

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

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