Full metadata
Title
Mechanics of silicon electrodes in lithium ion batteries
Description
As one of the most promising materials for high capacity electrode in next generation of lithium ion batteries, silicon has attracted a great deal of attention in recent years. Advanced characterization techniques and atomic simulations helped to depict that the lithiation/delithiation of silicon electrode involves processes including large volume change (anisotropic for the initial lithiation of crystal silicon), plastic flow or softening of material dependent on composition, electrochemically driven phase transformation between solid states, anisotropic or isotropic migration of atomic sharp interface, and mass diffusion of lithium atoms. Motivated by the promising prospect of the application and underlying interesting physics, mechanics coupled with multi-physics of silicon electrodes in lithium ion batteries is studied in this dissertation. For silicon electrodes with large size, diffusion controlled kinetics is assumed, and the coupled large deformation and mass transportation is studied. For crystal silicon with small size, interface controlled kinetics is assumed, and anisotropic interface reaction is studied, with a geometry design principle proposed. As a preliminary experimental validation, enhanced lithiation and fracture behavior of silicon pillars via atomic layer coatings and geometry design is studied, with results supporting the geometry design principle we proposed based on our simulations. Through the work documented here, a consistent description and understanding of the behavior of silicon electrode is given at continuum level and some insights for the future development of the silicon electrode are provided.
Date Created
2014
Contributors
- An, Yonghao (Author)
- Jiang, Hanqing (Thesis advisor)
- Chawla, Nikhilesh (Committee member)
- Phelan, Patrick (Committee member)
- Wang, Yinming (Committee member)
- Yu, Hongyu (Committee member)
- Arizona State University (Publisher)
Topical Subject
Resource Type
Extent
viii, 140 p. : col. ill
Language
eng
Copyright Statement
In Copyright
Primary Member of
Peer-reviewed
No
Open Access
No
Handle
https://hdl.handle.net/2286/R.I.24782
Statement of Responsibility
by Yonghao An
Description Source
Viewed on June 24, 2014
Level of coding
full
Note
thesis
Partial requirement for: Ph.D., Arizona State University, 2014
bibliography
Includes bibliographical references (p. 105-123)
Field of study: Mechanical engineering
System Created
- 2014-06-09 02:06:31
System Modified
- 2021-08-30 01:36:09
- 3 years 2 months ago
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