Dissertation
FROM MATERIALS TO ELECTRODES: DESIGN PRINCIPLES OF SULFUR CATHODES FOR HIGH-ENERGY LITHIUM-SULFUR BATTERIES
Washington State University
Doctor of Philosophy (PhD), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000006442
Handle:
https://hdl.handle.net/2376/119070
Abstract
Lithium-sulfur (Li-S) battery features a high theoretical energy (~2300 Wh kg-1) and an extremely low cost, making it one of the most cost-effective ($/kWh) battery technologies to meet the increasing demand of vehicle electrification and grid energy storage. A crucial prerequisite for delivering a high energy Li-S battery is the integration of a high-sulfur-loading cathode, a lean amount of electrolyte, and a limited Li anode. However, simultaneous application of these parameters often leads to a rapid performance deterioration, especially the reaction kinetics and cycling life. Fundamental mechanisms of the cell failure are still not very clear; synthesizing materials that can fulfill both high energy density and long cycle life of the Li-S batteries is still a significant challenge. Through our studies of the high-loading sulfur cathodes, designing electrode architecture with less electrode porosity is identified as one of the key parameters in the cathode design, playing a significant role on cell energy, sulfur utilization rate and even cell lifespan. In this dissertation, a clear understanding of the effect that electrode porosity has on reaction kinetics and cell life is elucidated through combined experimental and simulation approaches. Accordingly, from materials to electrodes, the design principles of a practical sulfur cathode have been proposed and verified by different electrochemical characterizations.
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Details
- Title
- FROM MATERIALS TO ELECTRODES: DESIGN PRINCIPLES OF SULFUR CATHODES FOR HIGH-ENERGY LITHIUM-SULFUR BATTERIES
- Creators
- Shuo Feng
- Contributors
- Yuehe Lin (Advisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 129
- Identifiers
- 99900592056701842
- Language
- English
- Resource Type
- Dissertation