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A Detailed Study of factors That Enhances the Performance of High-rate Li-Air Batteries

thesis
posted on 2023-05-01, 00:00 authored by Chengji Zhang
The rise in demand for electric transportation is widely acknowledged as a way to decrease reliance on fossil fuels and mitigate the impact of climate change. Among various contenders for advanced energy storage technology, the lithium-air battery has garnered significant attention due to its high theoretical energy density that is comparable to gasoline combustion. This renders it a promising option for powering fully electric vehicles. However, one of the significant challenges in its development is the high overpotential that occurs during the redox reaction between charge and discharge. Additionally, battery cycling results in electrolyte and electrode decomposition, which leads to cathode blockage, thereby reducing energy efficiency and cycle life. To overcome these challenges, this study introduces various methods, including a new solid-state catalyst and bi-functional electrolyte additives. As a result of these efforts, a significantly improved Li-O2 cell was developed, with a current density of up to 1mA/cm2 (equivalent to 10000mA/g). Furthermore, a Li-Air battery system was reported, and its discharge products were found to be lithium superoxide, as intended, rather than lithium peroxide under high current densities, thereby reducing discharge overpotentials and preventing cathode clogging. Additionally, 20 different RMs were analyzed for their electrochemical properties in the Li-O2 system using DMSO and TEGDME electrolytes through cyclic voltammetry (CV) experiments. The redox potential, cathodic and anodic peak separation, and current intensities were among the measured features. Different characterization techniques, including SEM, TEM, and Raman, were employed to investigate the battery's morphology and redox products, and battery cycling tests were conducted to gain a better understanding of the two-step mechanism of the Li-Oxygen battery system.

History

Advisor

Salehi-Khojin, Amin

Chair

Salehi-Khojin, Amin

Department

Mechanical and Industrial Enginnering

Degree Grantor

University of Illinois at Chicago

Degree Level

  • Doctoral

Degree name

PhD, Doctor of Philosophy

Committee Member

Curtiss, Larry A Ngo, Anh T Subramanian, Arunkumar Megaridis, Constantine M Khalili-Araghi, Fatemeh

Submitted date

May 2023

Thesis type

application/pdf

Language

  • en

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