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Characterization of Li-Ion Batteries...

Mohammadi, Mohaddese.

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Characterization of Li-Ion Batteries and Their Components Using Nuclear Magnetic Resonance Spectroscopy and Imaging.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of Li-Ion Batteries and Their Components Using Nuclear Magnetic Resonance Spectroscopy and Imaging./
作者:	Mohammadi, Mohaddese.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	135 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-06, Section: B.
Contained By:	Dissertations Abstracts International82-06B.
標題:	Physical chemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28088177
ISBN:	9798691232367

Characterization of Li-Ion Batteries and Their Components Using Nuclear Magnetic Resonance Spectroscopy and Imaging.
Mohammadi, Mohaddese.

Characterization of Li-Ion Batteries and Their Components Using Nuclear Magnetic Resonance Spectroscopy and Imaging. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 135 p.

Source: Dissertations Abstracts International, Volume: 82-06, Section: B.

Thesis (Ph.D.)--New York University, 2020.

This item must not be sold to any third party vendors.

Nuclear Magnetic Resonance (NMR) Spectroscopy and its imaging modality (MRI) are powerful and nondestructive characterization tools that have been widely used in medical and material science research fields. The non-destructive feature of these techniques makes them most favorable for applications where samples are required to be characterized in-situ or in-vivo. Recently, electrochemistry has benefited from operando NMR/ MRI characterization in the development of new electrochemical systems. The aim of this dissertation is to develop new NMR/MRI techniques as well as optimizing the existing methods for the purpose of operando and in-situ investigation of a lab-made or commercial electrochemical system. Through these newly developed methods, the information about the dynamics and structure of the electrochemical system's constituents was obtained. Some examples of these new insights include the correlation between lithium microstructure growth onset and the current density applied to the cell, the study of ion solvation and dynamics in aqueous electrolytes, and the study of the effect of the state of charge on current distribution inside Li-ion cells. This information is essential for the understanding of the electrode, ions, and electrolyte behavior in batteries.The thesis starts with an introduction of basic concepts and physical principles of nuclear magnetic resonance (NMR) spectroscopy and imaging, as well as, a brief overview of electrochemical systems, their main constituents, their major challenges in increasing their efficiency, and how NMR/MRI could be applied to help with diagnosis of failure mechanisms in electrochemical systems.In the second chapter, we focus on direct and in-direct observation of lithium microstructure growth on the surface of the Lithium metal electrode in Li-ion/ Li-metal batteries. Changing the approach from 7Li MRI, for the direct observation of Lithium microstructure, to 1H MRI, for an indirect sampling of the imaging microstructure, results in a five-fold enhancement in imaging resolution and in the ability of real-time 3D reconstruction of lithium microstructure. In the third chapter, we introduce a novel technique to image commercial Li-ion batteries, called inside-out MRI. Inside-out MRI exploits the effect of magnetic susceptibility of the materials inside a commercial Li-ion battery, on the magnetic field around the cell, to provide insight and information on the cell state of charge, the state health and the current distribution.In the last chapter, we focus on exploring the solvation dynamics of lithium isotopes in aqueous solution. The aqueous electrolyte could potentially be a safer option for the Li-ion electrolyte; however, its stable electrochemical window is too narrow. It has been shown that the aqueous electrolyte can operate within an electrochemical window of 3V using an extremely high-concentration aqueous Lithium electrolyte solution. We explored the dynamics and changes in the solvation structure of lithium ions in extremely high concentrations, monitoring their NMR characteristics, such as T1 relaxation rate and self-diffusion coefficients. These parameters revealed the fact that the solvation structure of ions changed in high concentration regime and had pronounced effects on their diffusion and T1 relaxation mechanism.

ISBN: 9798691232367Subjects--Topical Terms:

1981412
Physical chemistry.
Subjects--Index Terms:

Electrochemistry

Characterization of Li-Ion Batteries and Their Components Using Nuclear Magnetic Resonance Spectroscopy and Imaging.
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