Back to Search
Start Over
First-principles simulations of lithiation–deformation behavior in silicon nanotube electrodes
- Source :
- Computational Materials Science. 123:44-51
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The lithiation mechanisms that occur in silicon nanotube lithium-ion battery electrodes are not well understood at the atomic level. In this study, first-principles calculations were carried out to investigate the mechanism responsible for the insertion of lithium in armchair and zigzag nanotubes. The size dependence of the formation energy and the Young’s modulus was investigated for the placement of a single Li atom. Our simulations showed that the elastic softening of a zigzag nanotube will occur when a single Li atom was placed, and that the lithiated configuration will transform from a crystalline structure to an amorphous structure with increasing Li concentration for both armchair and zigzag nanotubes. Formation energy and voltage analyses also demonstrated that zigzag nanotubes exhibit a much steeper descending trend compared with armchair nanotubes. It was found that, under uniaxial tension, the corresponding fracture strength of a silicon nanotube will decrease with increasing Li concentration, and that the ductility of such a nanotube will be improved greatly with increasing Li concentration, meaning that plastic deformation will occur relatively easily. This understanding of the lithiation mechanisms will provide useful guidelines for the designing of silicon nanotube electrodes in lithium-ion batteries.
- Subjects :
- Silicon nanotube
Nanotube
Materials science
General Computer Science
General Physics and Astronomy
chemistry.chemical_element
Nanotechnology
02 engineering and technology
010402 general chemistry
01 natural sciences
Lithium-ion battery
Condensed Matter::Materials Science
General Materials Science
Composite material
General Chemistry
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
0104 chemical sciences
Amorphous solid
Carbon nanotube quantum dot
Computational Mathematics
Zigzag
chemistry
Mechanics of Materials
Lithium
Deformation (engineering)
0210 nano-technology
Subjects
Details
- ISSN :
- 09270256
- Volume :
- 123
- Database :
- OpenAIRE
- Journal :
- Computational Materials Science
- Accession number :
- edsair.doi...........e0d30080d27d32feebcc27bf5495c257