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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11902
Title: Modeling the delamination of amorphous-silicon thin film anode for lithium-ion battery
Authors: Pal, Siladitya
Damle S.S.
Patel S.H.
Datta M.K.
Kumta P.N.
Maiti S.
Published in: Journal of Power Sources
Abstract: Sputter-deposited amorphous silicon thin films on metallic copper current collectors are widely studied as lithium-ion anode systems. Electrochemical results indicate these electrodes exhibit near theoretical capacity for first few cycles; however delamination at the thin film-current collector interface causes rapid capacity fade leading to poor cycling performance. Primary reason for this interfacial delamination is the mechanical stress generated due to colossal volume expansion of silicon during lithiation. The focus of the current study is to present a mechanistic understanding of the role of mechanical properties of the current collector on this characteristic delamination behavior during electrochemical cycling. Toward this end, we have developed a computational framework that accounts for the coupled diffusion induced large deformation in silicon, elasto-plastic deformation of the current collector, as well as the nucleation and propagation of interfacial delamination. We have also performed a detailed parametric study to investigate the effect of mechanical properties of the current collector on the delamination of the thin film-current collector interface. We have accordingly determined that current collectors with low elastic modulus such as graphite can completely suppress interfacial delamination. Our analysis thus provides a sound mechanistic approach for designing next generation Si thin film anodes with improved capacity retention. © 2013 Elsevier B.V. All rights reserved.
Citation: Journal of Power Sources (2014), 246(): 149-159
URI: https://doi.org/10.1016/j.jpowsour.2013.06.089
http://repository.iitr.ac.in/handle/123456789/11902
Issue Date: 2014
Keywords: Current collector
Diffusion induced stress (DIS)
Interfacial delamination
Li-ion battery a-Si thin film anode
Mechanical properties
ISSN: 3787753
Author Scopus IDs: 35321222100
55568706200
23111442300
8431673800
55663968300
7202014965
Author Affiliations: Pal, S., Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, United States
Damle, S.S., Department of Chemical Engineering, University of Pittsburgh, PA 15261, United States, Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, PA 15261, United States
Patel, S.H., Department of Mechanical Engineering, Michigan Technological University, MI 49931, United States
Datta, M.K., Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, United States, Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, PA 15261, United States
Kumta, P.N., Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, United States, Department of Chemical Engineering, University of Pittsburgh, PA 15261, United States, Mechanical Engineering and Materials Science, University of Pittsburgh, PA 15261, United States, Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, PA 15261, United States
Maiti, S., Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, United States, Department of Chemical Engineering, University of Pittsburgh, PA 15261, United States, Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, PA 15261, United States
Funding Details: The authors would like to acknowledge the financial support from the US Department Of Energy's Office Of Vehicle Technologies BATT Program (Contract DE-AC02-05CHI1231), sub contract 6151369, and the National Science Foundation ( CBET-0933141 ). PNK would also like to acknowledge the Edward R. Weidlein Chair Professorship Funds for partial support of this work. In addition, PNK and SM would like to thank the Center for Complex Engineered Multifunctional Materials (CCEMM) for providing a graduate fellowship to perform the simulations and experiments reported in this work. Appendix A
Corresponding Author: Maiti, S.; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15261, United States; email: spm54@pitt.edu
Appears in Collections:Journal Publications [ME]

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