Graduate Thesis Or Dissertation

 

Synthesis and Characterization of Metal-Organic Battery Materials and Electrolytes Public Deposited

https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/xp68kh27g
Abstract
  • This dissertation concerns the physical inorganic electrochemistry of functional materials. The need for expanded energy storage motivates development of new material chemistries, and the combination of transition metals with redox-active organics represents a new approach to functional material design. This work details synthesis and electrochemical analysis of various metal-organic materials, and focuses on titanium(IV) dihydroxyanthraquinone as a novel redox-active material. Ti(1,8-DHAQ)2 in particular demonstrated promise as a negative electrode in an aqueous battery. This material was made via a one-pot synthesis resulting in amorphous micron-scale particles with titanium binding directly to the carbonyl feature as evidenced by scanning electron microscopy and infrared spectroscopy. When assembled in a coin cell with a lithium manganese oxide positive electrode, the active material can be electrochemically cycled with a charge density of 40 mAh/g at 1.1 V. These results inspired new approaches to metal-organic electrode design, with analogous metal-organic materials demonstrating increased cycling stability and a specific capacity over five times greater than the anthraquinone-based materials. This approach represents a new method of creating simple and scalable electrodes using metal-organic materials for versatile energy storage applications. Additionally, this work describes the use of computational tools to provide theoretical frameworks for the properties of inorganic complexes, the study of symmetric nonaqueous flow batteries and their current material limitations, and the creation of new classroom and laboratory demonstrations to provide students with a practical exposure to electrochemistry.

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  • 2020-11-11
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  • 2021-03-08
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