Review—"Knees" in Lithium-Ion Battery Aging Trajectories

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Review—"Knees" in Lithium-Ion Battery Aging Trajectories
Review—"Knees" in Lithium-Ion Battery Aging Trajectories
Journal Title:
Journal of The Electrochemical Society
Publication Date:
05 May 2022
Attia, P. M., Bills, A. A., Brosa Planella, F., Dechent, P., dos Reis, G., Dubarry, M., Gasper, P., Gilchrist, R., Greenbank, S., Howey, D., LIU, O., Khoo, E., Preger, Y., SONI, A., Sripad, S., Stefanopoulou, A., & Sulzer, V. (2022). Review—"Knees" in Lithium-Ion Battery Aging Trajectories. Journal of The Electrochemical Society.
Abstract Lithium-ion batteries can last many years but sometimes exhibit rapid, nonlinear degradation that severely limits battery lifetime. Here, we review prior work on “knees” in lithium-ion battery aging trajectories. We first review definitions for knees and three classes of “internal state trajectories” (termed snowball, hidden, and threshold trajectories) that can cause a knee. We then discuss six knee “pathways”, including lithium plating, electrode saturation, resistance growth, electrolyte and additive depletion, percolation-limited connectivity, and mechanical deformation, some of which have internal state trajectories with signals that are electrochemically undetectable. We also identify key design and usage sensitivities for knees. Finally, we discuss challenges and opportunities for knee modeling and prediction. Our findings illustrate the complexity and subtlety of lithium-ion battery degradation and can aid both academic and industrial efforts to improve battery lifetime.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the Agency for Science, Technology and Research (A*STAR) - Career Development Fund
Grant Reference no. : C210112037