Keywords and Phrases
Epoxide; Fluorinated electrolyte; Neutron reflectometry; Sol-gel; Solid electrolyte interphase; Vanadia
"This dissertation focuses on the synthesis and characterization of vanadium oxide nanomaterials and neutron-transparent Li-ion battery electrolytes.
Vanadium oxide gels were synthesized via the epoxide-assisted gelation of VOCl3 using epichlorohydrin in ethanol. This represents the first epoxide-assisted gelation developed for vanadium oxide gels and serves as a potential economical replacement for the fabrication of vanadium oxide gels via the hydrolysis of vanadium alkoxides. Though epoxide-assisted gelation has been demonstrated for a number of transition metal oxides, the gelation mechanism observed here for VOCl3 appears to be unique.
While investigating the electrochemical and structural properties of lithium vanadates, it became desirable to perform in situ neutron diffraction with electrochemical cycling. The inability to perform these experiments prompted the development of a series of perfluorocarboxylate esters which could potentially serve as neutron-transparent electrolyte solvents and help enable in situ neutron scattering characterizations. Electrochemical studies were carried out on Si anodes, and the solid-electrolyte-interphase was studied both ex situ and in situ. Results indicate that these electrolyte solvents improve neutron scattering data when used in place of standard deuterated carbonates and provide insight into fluorinated components proposed for next-generation electrolytes"--Abstract, page iv.
Winiarz, Jeffrey G.
Ph. D. in Chemistry
United States. Army Research Office
National Science Foundation (U.S.)
Oak Ridge Institute for Science and Education
Missouri University of Science and Technology. Materials Research Center
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Economical synthesis of vanadia aerogels via epoxide-assisted gelation of VOCl3
- A study of perfluorocarboxylate ester solvents for lithium ion battery electrolytes
- Evaluating the solid-electrolyte-interphase formed on silicon electrodes: a comparison of ex situ X-ray photoelectron spectroscopy and in situ neutron reflectometry
xiv, 149 pages
© 2015 Tyler Martin Fears, All rights reserved.
Dissertation - Open Access
Library of Congress Subject Headings
Vanadium oxide -- Synthesis
Electronic OCLC #
Fears, Tyler M., "Synthesis and characterization of vanadium oxide nanomaterials" (2015). Doctoral Dissertations. 2443.