Heterogeneous Damage in Li-Ion Batteries: Experimental Analysis and Theoretical Modeling
By Rong Xu, Yang Yang, Fei Yin, Pengfei Liu, Peter Cloetens, Yijin Liu, Feng Lin, K. Zhao. ECS Meeting Abstracts, 2019
290 citations recorded by the source corpus.
Abstract We assess the heterogeneous electrochemistry and mechanics in a composite electrode of commercial batteries using synchrotron X-ray tomography analysis and microstructure-resolved computational modeling. We visualize the morphological defects at multi-scales ranging from the macroscopic composite, particle ensembles, to individual single particles. Particle fracture and interfacial debonding are identified in a large set of tomographic data of active particles. Mechanical failure in the regime near the separator is more severe than toward the current collector. The active particles close to the separator experience deeper charge and discharge over cycles and thus are more mechanically loaded. The difference in the Li activity originates from the polarization of the electrolyte potential and the non-uniform distribution of the activation energy for the charge transfer reaction. We model the kinetics of intergranular fracture and interfacial degradation to confirm that the various Li activities are the major cause of the heterogeneous damage. The interfacial failure may reconstruct the conductive network and redistribute the electrochemical activities that render a dynamic nature of electrochemistry and mechanics evolving over time in the composite electrode. We further quantify the influence of the mechanical damage on the metrics of battery performance. We simulate the electrochemical impedance profile to build a relationship between the interfacial debonding and the impedance of electron transport and surface charge transfer. The mechanical failure disrupts the conduction path of electrons and results in significant polarization and capacity loss in batteries.
Subfields: Automotive Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/375aacec78236feb81ea4544fab8bd1c6000ddc6
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Citations in the corpus
- A continuum of physics-based lithium-ion battery models reviewed (2022, background): “There are also three-dimensional studies on the microstructure of electrode materials [133], using finite element methods, but they are computationally expensive and usually limited to beginning of life simulations.”