Alhashmi, Badriya (2018) A study of tantalum-based perovskites as anode materials for lithium-ion batteries. PhD thesis, University of Warwick.

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Abstract

In this thesis, I demonstrate my work on three types of Nano-particle materials, all of the perovskite structure with the intention to study their lithium-ion storage features. Two types of perovskite tantalates; sodium tantalate, NaTaO3, and potassium tantalate, KTaO3 were grown hydrothermally in this work. The third perovskite material; lithium tantalate, LiTaO3 was produced by Sol-gel method. The structure morphology was investigated by scanning electron microscopy SEM and powder X-Ray Diffraction. The electro chemical properties were investigated using both; the cyclic voltammetry (CV), and the charge discharge profile which gave us a better understanding of their abilities of lithium ions. Half -cells were used for the study. Coin cells, as well as two-electrode Swagelok cells, were used.

The hydrothermal synthesis has produced a fine powder product of sodium tantalate and potassium tantalate. The solid-state method was used to produce the potassium tantalate material as well. A quality product of lithium tantalate was produced by Sol-gel method. The electrochemical properties were tested. The consistent resultant capacity of the type of material acting as an active material for lithium ion storage is quite interesting. It showed better electrochemical stability than the other two materials; potassium tantalate and sodium tantalate. The electrochemical test shows that there is a relatively high drop in the value of the irreversible capacity after the first cycle for the three materials. More studies must be conducted to give explanations and solutions leading to solid electrochemical findings. Initial test cells were constructed and tested, but solid electrochemical results could not be gathered before the end of the project.

Item Type:	Thesis (PhD)
Subjects:	Q Science > QC Physics
Library of Congress Subject Headings (LCSH):	Lithium ion batteries -- Materials, Anodes -- Materials, Perovskite -- Industrial applications, Tantalates, Scanning electron microscopy, X-ray diffraction imaging, Voltammetry
Official Date:	January 2018
Dates:	Date Event January 2018 Submitted
Institution:	University of Warwick
Theses Department:	Department of Physics
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Sloan, Jeremy ; McConville, C. F. (Chris F.)
Format of File:	pdf
Extent:	xiv, 127 leaves : illustrations, charts
Language:	eng

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