Imperial College London
Alternate

Prof Gregory Offer

Faculty of Engineering, Department of Mechanical Engineering

Professor in Electrochemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7072gregory.offer Website

 
 
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Location

 

720City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhuo:2023:10.1016/j.jpowsour.2022.232461,
author = {Zhuo, M and Offer, G and Marinescu, M},
doi = {10.1016/j.jpowsour.2022.232461},
journal = {Journal of Power Sources},
pages = {1--16},
title = {Degradation model of high-nickel positive electrodes: Effects of loss of active material and cyclable lithium on capacity fade},
url = {http://dx.doi.org/10.1016/j.jpowsour.2022.232461},
volume = {556},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Nickel-rich layered oxides have been widely used as positive electrode materials for high-energy-density lithium-ion batteries, but the underlying mechanisms of their degradation have not been well understood. Here we present a model at the particle level to describe the structural degradation caused by phase transition in terms of loss of active material (LAM), loss of lithium inventory (LLI), and resistance increase. The particle degradation model is then incorporated into a cell-level P2D model to explore the effects of LAM and LLI on capacity fade in cyclic ageing tests. It is predicted that the loss of cyclable lithium (trapped in the degraded shell) leads to a shift in the stoichiometry range of the negative electrode but does not directly contribute to the capacity loss, and that the loss of positive electrode active materials dominates the fade of usable cell capacity in discharge. The available capacity at a given current rate is further decreased by the additional resistance of the degraded shell layer. The change pattern of the state-of-charge curve provides information of more dimensions than the conventional capacity-fade curve, beneficial to the diagnosis of degradation modes. The model has been implemented into PyBaMM and the source codes are openly available in the GitHub repository https://github.com/mzzhuo/PyBaMM/tree/pe_degradation.
AU  - Zhuo,M
AU  - Offer,G
AU  - Marinescu,M
DO  - 10.1016/j.jpowsour.2022.232461
EP  - 16
PY  - 2023///
SN  - 0378-7753
SP  - 1
TI  - Degradation model of high-nickel positive electrodes: Effects of loss of active material and cyclable lithium on capacity fade
T2  - Journal of Power Sources
UR  - http://dx.doi.org/10.1016/j.jpowsour.2022.232461
UR  - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000899371600001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
UR  - https://www.sciencedirect.com/science/article/pii/S0378775322014380?via%3Dihub
UR  - http://hdl.handle.net/10044/1/101583
VL  - 556
ER  -
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