Theses and Dissertations

Date of Award

12-2018

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Dr. Mataz Alcoutlabi

Second Advisor

Dr. Jason Parsons

Third Advisor

Dr. Horacio Vasquez

Abstract

In this study, Forcespinning is used to produce Titanium sulfide (TiS2)/carbon composite fibers for use as lithium-ion battery anodes. The high surface area to volume ratio of the composite fibers can have a high impact on the ionic and electronic conductivity of the active materials leading to improved electrochemical performance of the battery. TiS2 nanoparticles were chosen as the active materials to produce Metal-Li-alloys/C composite fibers due to their high theoretical capacity and low volume change during charge/discharge cycles. The use of a 2-D layered structure of TiS2 nanoparticles in the carbon fiber matrix can greatly accommodate more Li-ions between the layers leading to increased specific capacity, improved stability and good electrochemical performance of the anode after prolonged charge/ discharge cycles. During the preparation of TiS2/C composite fibers, the TiS2 nanoparticles turned into a 2-D layered structure of TiO2 nanoparticles after the oxidation process in air environment With the addition of of TiO2 nanoparticles to the carbon-fibers matrix, the composite-fibers anodes delivered discharge and charge capacities at the first cycle of 900 mAhg-1 and 600 mAhg-1 , respectively. The TiO2/C composite-fibers anode delivered a charge capacity of 250 mAhg-1 after 100 cycles at 50 mAg-1 . The TiO2/C composite fibers show an improvement in the electrochemical performance at higher current density over the commercially available graphite anode.

Comments

Copyright 2018 Jorge Lopez. All Rights Reserved.

https://go.openathens.net/redirector/utrgv.edu?url=https://www.proquest.com/dissertations-theses/synthesis-design-metals-sulfide-carbon-composite/docview/2177364630/se-2?accountid=7119

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