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Nano-Engineering And Advanced Characterizations Of Layered-Structure Electrode Materials For Lithium-Ion And Sodium-Ion Batteries, Sujith Kalluri

University of Wollongong Thesis Collection 1954-2016

Undoubtedly, there is a huge demand for renewable energy storage devices for various everyday applications, from portable electronics to large-scale applications such as electric vehicles and energy storage for electrical grids, made especially urgent due to the depletion of fossil fuels. Currently, rechargeable lithium-ion battery (LIB) technology is most prominently used in mobile or portable electronics, which has raised a huge demand for expensive lithium, the reserves of which would not be sufficient for a future huge share of electric vehicles and grid-scale energy storage, thereby putting severe pressure on lithium production and its cost. Alongside LIB technology, both academic …

Investigating How The Electric Discharge Properties Affect The Synthesis And Processing Of Materials By Electric Discharge Assisted Mechanical Milling, Andrzej Marek Aksenczuk

University of Wollongong Thesis Collection 1954-2016

No abstract provided.

Development Of New Electrode Materials For Lithium Ion Batteries And Lithium Oxygen Batteries, Jun Wang

University of Wollongong Thesis Collection 1954-2016

Lithium-ion batteries (LIBs) have been widely used as the power sources for a wide range of portable electronic devices, such as cell phones, laptops, and digital cameras, since their first commercialization in the 1990s. In recent years, enormous ongoing efforts have been made to develop the next generation of LIBs, which feature thinner, smaller sizes, lighter weight, flexibility, higher capacity and rate capability, and longer cycle life. Advanced electrode materials are the key to realizing this goal. High performance anode materials are the key to one of the most important components in LIBs, and they thus have attracted much research …

Advanced Graphene-Metal Oxide Nanostructured Composites For Supercapacitors, Alfred Tawirirana Chidembo

University of Wollongong Thesis Collection 1954-2016

The development of alternative energy storage systems is undoubtedly one of the greatest challenges facing our modern society as a result of emerging ecological concerns. The ever-increasing environmental concerns and the need for efficient energy storage devices have catapulted research in this field, mainly focused on electric double layer capacitors (EDLC’s), also known as supercapacitors, which consist of carbon based materials. The ultimate performance of these devices strongly depends on the intrinsic properties of their constituent materials and their eventual architectural design.

The main focus of this doctoral thesis is to develop high performance supercapacitor electrodes utilising simple and cost …

Nanostructured Carbon Electrodes, Dennis Antiohos

University of Wollongong Thesis Collection 1954-2016

Supercapacitors are promising energy storage and power output technologies due to their improved energy density, rapid charge-discharge cycle, high cycle efficiency and long cycle life. Free standing poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) / single walled nanotube films have been characterised by scanning electron microscopy, Raman spectroscopy and thermo-gravimetric analysis to understand the physical properties of the films. Films with varying compositions of poly(3,4-ethylenedioxythiophene) / poly(styrene sulfonate) and single walled nanotubes were compared by electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge / discharge to understand their electrochemical properties. A comparison of the results shows that having single walled nanotubes dispersed throughout the …

Development Of Graphene Composite Materials For Lithium Ion Batteries, Chao Zhong

University of Wollongong Thesis Collection 1954-2016

Global warming caused by the excessive use of fossil fuels has become a severe problem in the modern world. Increasing energy demand worldwide and mandates to minimize greenhouse gas emissions require the production of energy in a sustainable manner and efficient usage of that energy. Lithium ion batteries (LIBs) have demonstrated themselves to be one of the most promising electrochemical energy storage approaches. During the past two decades, LIBs have become the dominant power source for a wide range of portable electrical devices. The large-scale potential lithium ion battery applications, however, such as electric vehicles (EVs), hybrid electric vehicles (HEVs), …

Carbon Nanotube Architectures With Metallic Nanoparticles Towards Energy Applications, Peter Sherrell

University of Wollongong Thesis Collection 1954-2016

Within this thesis we demonstrate the formation of 3-dimensional, potentially freestanding, entangled carbon nanotube architectures through the use of previously untested organo-metallic catalysts, Iron (III) Tosylate, Cobalt (II) Tosylate, and Nickel (II) Tosylate. The effect of catalyst concentration, hydrocarbon decomposition temperature and growth time were examined in terms of the produced architectures morphologies. As capacitive devices these as produced carbon nanotube architectures demonstrated impressive maximum capacitances of up to 182.9 F/g with a power density of 15 kW/kg and an energy density of 4.06 Wh/kg.

In addition we develop and optimise the decoration of metallic nanoparticles including, platinum, palladium, gold, …

Probing Nanoscale Properties Of Organic Conducting Polymer Interfaces Using Atomic Force Microscopy, Amy Alexis Gelmi

University of Wollongong Thesis Collection 1954-2016

The development of new biomaterials for the field of bionics- the fusion of electronic devices with biological tissue- is an exciting area of research. The ability to control the interaction between the electronic and biological interface in devices, such as the cochlear implant, are crucial for enhancing and improving their biocompatibility and performance.

Organic conducting polymers are widely studied for use as biomaterials to replace the conventional metallic materials currently used as electrodes and coatings in medical devices. These polymers are highly interesting due to fine level of control over material properties and the ability to incorporate biological components into …