Cracking predictions of lithium-ion battery electrodes by X-ray computed tomography and modelling

被引:95
作者
Boyce, Adam M. [1 ,2 ]
Martinez-Paneda, Emilio [3 ]
Wade, Aaron [1 ,2 ]
Zhang, Ye Shui [1 ,2 ,4 ]
Bailey, Josh J. [1 ,2 ,5 ]
Heenan, Thomas M. M. [1 ,2 ]
Brett, Dan J. L. [1 ,2 ]
Shearing, Paul R. [1 ,2 ]
机构
[1] UCL, Dept Chem Engn, Electrochem Innovat Lab, London WC1E 7JE, England
[2] Faraday Inst, Quad One, Becquerel Ave,Harwell Campus, Didcot OX11 0RA, Oxon, England
[3] Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England
[4] Univ Aberdeen, Sch Engn, Aberdeen AB24 3UE, Scotland
[5] Queens Univ Belfast, Sch Chem & Chem Engn, Belfast BT7 1NN, North Ireland
关键词
Lithium-ion battery; Image-based model; Phase field; Fracture; Electrode; Microstructure; SINGLE-PARTICLE MODEL; FRACTURE; PHASE; DEGRADATION; BINDER; INSERTION; INTERCALATION; MECHANICS; CATHODE; STRESS;
D O I
10.1016/j.jpowsour.2022.231119
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Fracture of lithium-ion battery electrodes is found to contribute to capacity fade and reduce the lifespan of a battery. Traditional fracture models for batteries are restricted to consideration of a single, idealised particle; here, advanced X-ray computed tomography (CT) imaging, an electro-chemo-mechanical model and a phase field fracture framework are combined to predict the void-driven fracture in the electrode particles of a realistic battery electrode microstructure. The electrode is shown to exhibit a highly heterogeneous electrochemical and fracture response that depends on the particle size and distance from the separator/current collector. The model enables prediction of increased cracking due to enlarged cycling voltage windows, cracking susceptibility as a function of electrode thickness, and damage sensitivity to discharge rate. This framework provides a platform that facilitates a deeper understanding of electrode fracture and enables the design of next-generation electrodes with higher capacities and improved degradation characteristics.
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收藏
页数:14
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