Bonding and structures of light element energy systems under extreme conditions
Abstract/Contents
- Abstract
- This dissertation focuses on investigating the effect of pressure on the structure and bonding of three types of light-element energy systems using a suite of synchrotron x-ray characterization probes including diffraction, spectroscopic and imaging techniques. Ammonia borane (AB), which contains a remarkably high hydrogen content, shows rich structural and dihydrogen bonding variations upon compression. More strikingly, AB is found to be capable of storing a significant amount of extra hydrogen molecules in addition to the hydrogen chemically stored in itself, which makes this novel AB-H2 compound one of the most hydrogen rich materials currently known. LiMn2O4, a promising cathode material for Li-ion batteries, is found to be extremely sensitive to deviatoric stress which triggers a cubic-to-tetragonal phase transition. Such a transition during the battery working environment is detrimental to both the performance and lifetime. However, the nanostructured material can accommodate more stress and strain compared to its bulk counterpart. Glassy carbon, which has very low density and 100% sp2 bonding at ambient conditions, undergoes a transition to amorphous diamond at high pressure. This new carbon allotrope possesses an amorphous structure with 100% sp3 bonds and exceptional hardness. The property of superhardness, if turns out to be isotropic, can be advantageous relative to crystalline diamond for which the hardness is highly anisotropic. The findings could lead to new classes of ultradense and strong materials that can serve as energy-efficient components such as wear resistant parts for all kinds of transportation.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Lin, Yu |
|---|---|
| Associated with | Stanford University, Department of Geological and Environmental Sciences. |
| Primary advisor | Mao, Wendy (Wendy Li-wen) |
| Thesis advisor | Mao, Wendy (Wendy Li-wen) |
| Thesis advisor | Brown, G. E. (Gordon E.), Jr |
| Thesis advisor | Stebbins, Jonathan Farwell |
| Advisor | Brown, G. E. (Gordon E.), Jr |
| Advisor | Stebbins, Jonathan Farwell |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Yu Lin. |
|---|---|
| Note | Submitted to the Department of Geological and Environmental Sciences. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Yu Lin
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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