The chemistry, kinetics, and implications of oxygen defects in Li-excess oxides
Abstract/Contents
- Abstract
- Li-excess layered oxides are a promising class of positive electrode materials with the potential to simultaneously improve both the energy density and cost of Li-ion battery systems. However, these materials suffer from several adverse electrochemical properties resulting from a host structure that becomes unstable at low lithium contents. In this dissertation, a comprehensive view of the role of oxygen defects in Li-excess oxides will be developed. First, the coupling of oxygen and lithium defects will be rationalized from thermodynamic principles. Using X-ray spectroscopy and ptychography, the continuous loss of oxygen from Li-excess materials over cycling will then be demonstrated. Surprisingly, a variety of characterization techniques indicate that the oxygen-deficient bulk structure contains persistent oxygen vacancies, offering a unified framework for understanding previous observations of transition metal reduction and cation disordering with cycling. I will then investigate other factors which affect the oxygen release process, including the lithium content and the particle morphology. Overall, the results presented in this dissertation inform the design and utilization of Li-excess oxides and illuminate promising chemical, structural, and morphological approaches for mitigating oxygen release in layered oxide materials.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2021; ©2021 |
| Publication date | 2021; 2021 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Csernica, Peter Michael |
|---|---|
| Degree supervisor | Chueh, William |
| Thesis advisor | Chueh, William |
| Thesis advisor | Lindenberg, Aaron Michael |
| Thesis advisor | Salleo, Alberto |
| Degree committee member | Lindenberg, Aaron Michael |
| Degree committee member | Salleo, Alberto |
| Associated with | Stanford University, Department of Materials Science and Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Peter Michael Csernica. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/cf776vd7593 |
Access conditions
- Copyright
- © 2021 by Peter Michael Csernica
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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