PHENOLIC RESIN/POLYHEDRAL OLIGOMERIC SILSESQUIOXANE (POSS) HYBRID NANOCOMPOSITES AND ADVANCED COMPOSITES FOR USE AS ANODE MATERIALS IN LITHIUM ION BATTERIES
The work presented in this thesis can be divided into two research
areas. First, two sets of organic-inorganic hybrid nanocomposites
containing phenolic resin/trisilanolphenyl-POSS and phenolic
resin/octa(aminophenyl)-T8-POSS nanocomposites were
synthesized and the morphology and properties were investigated.
Octa(aminophenyl)-T8-polyhedral silsesquioxane is an
octafunctional-T8-POSS containing eight aniline-like amino
groups, one on each corner silicon atom. It was synthesized in our
laboratory by an improved two-step reaction sequence; nitration
(HNO3) and reduction (HCOOH/Et3N). Varying amounts of
POSS were codissolved with a resole phenolic resin in organic
solvent. This was followed by solvent removal and thermal
curing. Intermolecular interactions in these nanocomposites were
probed by FT-IR. The micro-morphology and aggregation state of
POSS were investigated using SEM, TEM, and WAXD studies.
The thermal and mechanical properties and thermal stabilities of
these composites were investigated by DMTA, DSC, and TGA.
Second, two types of carbon-covered mono- and bimetallic (Sn,
and Sn/Sb alloy) nanorods for use as anode materials in lithium
ion batteries were synthesized by a thermal chemical vapor
deposition method. Commercial antimony and tin oxide
(Sb3O4/SnO2) nanopowders and added tin (IV) oxide (SnO2)
nanoparticles (~19 nm) were used as the precursors for the growth
of bimetallic Sn/Sb alloy and monometallic Sn nanorods,
respectively. In addition, the shape of the products recovered were
different when different hydrocarbon gas flow rates were used for
growing intermetallic nanorods in carbon templates. Acetylene
and methane were the gases tried. The morphologies and
structures of the intermetallic nanorods in carbon templates were
investigated using SEM and TEM and proved by X-EDS, XRD,
and XPS studies.
Advisor:Steven Gwaltney; Hossein Toghiani; Charles U. Pittman, Jr.
School:Mississippi State University
School Location:USA - Mississippi
Source Type:Master's Thesis
Date of Publication:09/24/2007