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Reducing Over-Potentials in Lithium-Oxygen Batteries Using Iridium and Reduced Graphene Oxide Cathodes
thesis
posted on 2021-12-01, 00:00 authored by Samuel Thomas PlunkettThe focus of this dissertation was to characterize the electrochemical mechanisms and discharge products present in Li-O2 batteries containing iridium and reduced graphene oxide (rGO) based cathodes. These novel materials are used to stabilize the lithium superoxide (LiO2) reaction intermediate and prevent chemical disproportionation to the more common lithium peroxide (Li2O2) discharge product. Strong lattice matching between iridium-based catalyst surfaces and LiO2 increases the activation barrier of LiO2 disproportionation to Li2O2. Stabilizing LiO2 as the discharge product results in lower battery charge overpotentials due to the substantially higher electronic conductivity of LiO2, compared to Li2O2, which is a bulk insulator.
History
Advisor
Chaplin, BrianAl-Hallaj, SaidChair
Chaplin, BrianDepartment
Chemical EngineeringDegree Grantor
University of Illinois at ChicagoDegree Level
- Doctoral
Degree name
PhD, Doctor of PhilosophyCommittee Member
Curtiss, Larry Wang, Hsien-Hau Cabana, JordiSubmitted date
December 2021Thesis type
application/pdfLanguage
- en