Electrochemical transport in energy storage systems
Abstract/Contents
- Abstract
- Rechargeable lithium batteries are electrochemical devices widely used in portable electronics and electric-powered vehicles. A breakthrough in battery performance requires advancements in battery cell configurations at the microscale level. This, in turn, places a premium on the ability to accurately predict complex multiphase thermo-electrochemical phenomena, e.g., migration of ions interacting with composite porous materials that constitute a battery cell microstructure. Optimal design of porous cathodes requires efficient quantitative models of microscopic (pore-scale) electrochemical processes and their impact on battery performance. We derive effective properties (electrical conductivity, ionic diffusivity, reaction parameters) of a composite electrode comprising the active material coated with a mixture of the binder and conductor (the carbon binder domain or CBD). These effective descriptors ensure the conservation of mass and charge. When used to parameterize industry-standard pseudo-two-dimensional (P2D) models, they significantly improve the predictions of lithiation curves in the presence of CBD. We identified a P2D model that provides a middle ground between model complexity and prediction accuracy. On the lithium anode, dendritic growth is a leading cause of degradation and catastrophic failure of batteries with lithium anodes, e.g., lithium-metal batteries and all-solid-state lithium batteries. Deep understanding of this phenomenon would facilitate the design of strategies to reduce, or completely suppress, the instabilities characterizing electrodeposition on the lithium anode. We present linear stability analyses to quantify the interfacial instability associated with dendrite formation in terms of the battery's operating conditions and the electrochemical and physical properties of battery materials. This would improve the safety of lithium-metal batteries with liquid electrolyte and all-solid-state lithium batteries. When considered holistically, the quantitative nature of our work provides mechanistic insights into the optimal design of i) porous cathodes, ii) electrolytes, and iii) dendrite-suppressing buffers between the lithium-metal anode and electrolyte. The design of electrolytes involves the optimal selection of a solvent and salt, the tuning of the ionic concentration of the solution, and the deployment of anisotropic electrolytes (e.g., liquid crystals, liquid-crystalline physical gels, and the use of separators with anisotropic pore structures or columnized membranes).
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 | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Li, Weiyu |
|---|---|
| Degree supervisor | Tartakovsky, Daniel |
| Degree supervisor | Tchelepi, Hamdi |
| Thesis advisor | Tartakovsky, Daniel |
| Thesis advisor | Tchelepi, Hamdi |
| Thesis advisor | Chu, Steven |
| Thesis advisor | Cui, Yi, 1976- |
| Degree committee member | Chu, Steven |
| Degree committee member | Cui, Yi, 1976- |
| Associated with | Stanford Doerr School of Sustainability |
| Associated with | Stanford University, Department of Energy Resources Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Weiyu Li. |
|---|---|
| Note | Submitted to the Department of Energy Resources Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/xz417vq2069 |
Access conditions
- Copyright
- © 2023 by Weiyu Li
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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