A Reformulation of the Pseudo2D Battery Model Coupling Large Electrochemical-Mechanical Deformations at Particle and Electrode Levels

Mai, Weijie; Colclasure, Andrew; Smith, Kandler

doi:10.1149/2.0101908jes

Title: A Reformulation of the Pseudo2D Battery Model Coupling Large Electrochemical-Mechanical Deformations at Particle and Electrode Levels

Journal Article · Mon Apr 22 00:00:00 EDT 2019 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0101908jes· OSTI ID:1508204

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The Pseudo2D electrochemical reaction/transport battery model is consistently reformulated based on the finite strain theory to incorporate the coupled effects of large electrochemical-mechanical deformations at both particle and electrode levels. The active material volume change due to lithium insertion/extraction causes the electrode deformation and porosity variation. The porosity variation affects the mechanical properties of each component of the cell as well as the transport processes. Consecutively, the electrode deformation also affects porosity variation and the electrochemical processes (transport and equilibrium potential). Variables such as particle size and specific surface area are also simultaneous updated based on the approximated electrode deformation and porosity distributions. The model is applied to simulate the performance of a cell composed of Si anode and NMC532 cathode to study the effect of active material volume change on the cell performances. The simulation results show that during the charging process the porosity of each cell component experiences significant reduction due to the large expansion of Si particles. Also, a notable hydrostatic stress develops within the cell, which introduces an overpotential in addition to that caused by porosity reduction. The model is also employed to study the effects of charging rate, initial anode porosity, cell loading and fixture condition.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1508204

Alternate ID(s):: OSTI ID: 1514838

Report Number(s):: NREL/JA-5400-73221; /jes/166/8/A1330.atom

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Vol. 166 Journal Issue: 8; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

Citation information provided by
Web of Science

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