Exploring the Li-S system for next-generation batteries
Abstract/Contents
- Abstract
- Lithium-sulfur (Li-S) batteries have a high theoretical energy density of ~2500 Wh/kg (vs. ~400 Wh/kg of Li-ion batteries) and are promising candidates for meeting future energy storage demands. However, the practical applications of Li-S batteries have been severely hindered by its poor cycling life and stability. In the first part of my thesis, I will discuss the lithium polysulfide dissolution problem, which is a major problem plaguing Li-S batteries causing fast capacity degradation and poor cycle life. Upon establishing a standard procedure to quantitatively compare the polysulfide adsorption capability of candidate materials, a useful strategy is developed to screen materials and allow for rational design of long cycle life Li-S batteries. In the second part, I will further explore the Li-S system via a novel battery scheme by utilizing a P/C nanocomposite anode and pairing it with a Li2S coated carbon nanofiber cathode. It is discovered that the red P anode can be compatible in ether-based electrolyte systems and can be successfully coupled to a Li2S cathode. The new design concept full-cell displays remarkable specific capacity, rate and cycling performances. In the final part, I will present a characterization method via rotating disk electrode to further study the Li-S system. This method can be generally applied to various sulfur species, current collectors and electrolyte systems to provide additional insight towards achieving superior rechargeable batteries that can eventually replace Li-ion batteries.
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 | Wu, David Sichen |
|---|---|
| Degree supervisor | Cui, Yi, 1976- |
| Thesis advisor | Cui, Yi, 1976- |
| Thesis advisor | Brongersma, Mark L |
| Thesis advisor | Dauskardt, R. H. (Reinhold H.) |
| Degree committee member | Brongersma, Mark L |
| Degree committee member | Dauskardt, R. H. (Reinhold H.) |
| Associated with | Stanford University, Department of Materials Science and Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | David Wu. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2021. |
| Location | https://purl.stanford.edu/jn171pq2159 |
Access conditions
- Copyright
- © 2021 by David Sichen Wu
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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