Term of Award

Spring 2015

Degree Name

Master of Science in Applied Physical Science (M.S.)

Document Type and Release Option

Thesis (open access)

Copyright Statement / License for Reuse

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


Department of Electrical Engineering

Committee Chair

Ji Wu

Committee Member 1

Rafael Quirino

Committee Member 2

John Stone


A unique electrospinning method was implemented to fabricate composite nanofibers for lithium ion battery applications. The composite nanofibers were made of amorphous carbon, rutile phase TiO2, and cubic phase Si nanoparticles. Sulfur was utilized as a template to form void structures within the TiO2 nanofiber matrix. This provides the desired space for the Si expansion during the lithiation process. Phase, structure, composition, and morphology of the nanofibers were characterized using Raman spectroscopy, SEM, EDS, TGA, and powder XRD. Carbonized TiO2 nanofibers showed a low but stable specific capacity. Si Nanoparticles demonstrated an initially high but fast degrading capacity. In contrast, silicon in SiNP/C/TiO2 nanofibers with sulfur as a template exhibits an impressive high specific capacity of ~3459 mAh g-1initially, 54% of which can be maintained after 180 cycles.