Theses and Dissertations

Date of Award

5-2023

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Dr. Mataz Alcoutlabi

Second Advisor

Dr. Ali Ashraf

Third Advisor

Dr. Javier Ortega

Abstract

This thesis focuses on the process of oxidizing centrifugally spun precursor fibers and the subsequent process of carbon coating via chemical vapor deposition (CVD) for use as anode material in lithium-ion batteries (LIBs). Metal oxides have been studied as a potential replacement for graphite as they have been shown to have high theoretical capacities, good electronic conductivity, and can be synthesized using low-cost, scalable methods. However, metal oxides with high theoretical capacities also have low cycle life. To avoid this, metal oxides have been integrated with carbon to expand their life cycle. The work in this thesis shows the synthesis of SnO2/TiO2 composite short fibers with different ratios, followed by the deposition of carbon to be used as active material for LIB anodes. When tested, SnO2/TiO2 (3:1) CVD with a deposition time of 60-min demonstrated a specific capacity of 499 mAh g-1 and capacity retention of 111% after 100 cycles. In comparison, the 30-min had a specific capacity of 653 mAh g-1 after 61 cycles and is projected to have a capacity retention of 93.2% after 100 cycles. The results were individually compared to the non-coated and parent materials of SnO2 and TiO2.

Comments

Copyright 2023 David A. Sanchez. All Rights Reserved.

https://go.openathens.net/redirector/utrgv.edu?url=https://www.proquest.com/dissertations-theses/effects-carbon-coating-on-electrochemical/docview/2844927337/se-2?accountid=7119

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