Back to Search
Start Over
Modeling the delamination of amorphous-silicon thin film anode for lithium-ion battery
- Source :
- Journal of Power Sources. 246:149-159
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
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.
- Subjects :
- Amorphous silicon
Materials science
Silicon
Renewable Energy, Sustainability and the Environment
Delamination
Energy Engineering and Power Technology
chemistry.chemical_element
Current collector
Lithium-ion battery
Anode
chemistry.chemical_compound
chemistry
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Deformation (engineering)
Thin film
Composite material
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 246
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........aeb85593d0ff6a8ff1f76e36060223b9
- Full Text :
- https://doi.org/10.1016/j.jpowsour.2013.06.089