This item is under embargo and not available online per the author's request. For access information, please visit http://digital.wustl.edu/publish/etd-search.html.
Abstract
Lithium-air batteries have become increasingly popular due to their high theoretical energy density of 11,000 Wh/kg [1]. However, there are several challenges associated with lithium-air batteries. This project aims to gain a better understanding of the solid product produced from discharge of lithium-oxygen batteries by observing the lithium peroxide dependence on time spent discharging, time spent soaking for titration analyses, and cathode orientation. These experiments were performed using titration and UV-visible spectrophotometry. The lithium peroxide content was analyzed in cathodes with four different discharge times at the same current density. It was determined that there is a linearly increasing relationship between the discharge time and the mass of lithium peroxide; however, there is no significant relationship between the discharge time and the mass fraction of the experimental to theoretical mass of lithium peroxide. The dependence of lithium peroxide content on the soaking time in the titration solution was analyzed by comparing eight different soaking times on quarter cathodes. It was determined that there is no significant relationship between soaking time and mass fraction of lithium peroxide. The lithium peroxide dependence on cathode orientation – the coated side of the cathode facing towards the separator or away from the separator – was analyzed, and no significant relationship between cathode orientation and mass fraction was determined.
Document Type
Final Report
Class Name
Mechanical Engineering and Material Sciences Independent Study
Language
English (en)
Date of Submission
5-13-2025
Recommended Citation
Ma, Helen, "Experimental Measurements of Compounds in Lithium-Air Battery Discharge Products" (2025). Mechanical Engineering and Materials Science Independent Study. 288.
https://openscholarship.wustl.edu/mems500/288