Degree Type

Thesis

Date of Award

2017

Degree Name

Master of Science

Department

Materials Science and Engineering

Major

Materials Science and Engineering

First Advisor

Steve W. Martin

Abstract

Solid electrolytes for batteries are of particular interest for future green technology use. Oxy-sulfide glasses are some of the most conductive glassy ion conductors and are explored here for their potential in incorporation of nitrogen by ammonolysis. In an attempt to stabilize the volatile sulfide glass and further increase conductivity, a system for the ammonolysis of oxide and oxy-sulfide glasses has been built and tested for synthesizing lithium ion conducting amorphous materials. Pure oxide, lithium metaphosphate glasses were nitrided with the ammonolysis system, then analyzed and determined to successfully incorporate nitrogen, only more slowly than previous studies. Lithium oxy-sulfide glasses were then nitrided uncovering difficulties in incorporating nitrogen and crystallization upon cooling during ammonolysis.

Techniques to determine how well nitrogen was incorporated into the glass were combustion and XPS, while the structure was analyzed with IR and Raman spectroscopy, the glass transition temperature was determined with DSC, and ionic conductivity was determined through electrochemical impedance spectroscopy. Both nitridation parameters and glass properties were investigated to identify potential issues with the system, with flow rate, gas flow, glass composition, crystallization and internal bubbles being primary issues that will need to be overcome to successfully nitride oxy-sulfide glasses.

Copyright Owner

Peter Anthony Enz

Language

en

File Format

application/pdf

File Size

69 pages

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