الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
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Abstract
Electrochemical energy storage devices have promoted considerable revolution to the state-of-
the-art energy storage technologies because of the commercialization of portable electronics
and the potential for widespread implementation on plug-in hybrid electric vehicles. To
advance such technologies, it is of great importance to develop electrode materials with high
electrochemical activity. As a result, developing and improving the performance of these active
materials is critical to improving the performance of these types of energy devices.
Nanostructured materials have a lot of promise as an effective electrode material for high-
performance supercapacitor applications. In my thesis, I show how to produce nanostructured
materials from transition metal oxides and sulfides in a simple and efficient sol–gel auto-
combustion and hydrothermal method for Li-ion batteries and supercapacitor applications. In
this respect, the fundamental elements of supercapacitors in terms of charge storage methods,
as well as recent advancements in the design and manufacture of electrode materials, as well
as energy-related performance, were discussed.
In Chapter 3: Spinel Li2 Co 1-x Cu xTi3 O8 nanopowders (x = 0, 0.25, 0.5 molar ratios) have been
fabricated using a sol–gel auto-combustion method. The synthesis conditions such as annealing
temperature, Cu2+ ion substituted on the crystal structure, microstructure and chemical
composition were investigated using X-ray diffraction, scanning electron microscopy and X-
rays photoelectron spectroscopy, respectively. Furthermore, the electrochemical properties of
have been inspected via cyclic voltammetry (CV), galvanostatic charge-discharge, and
electrochemical impedance spectroscopy (EIS). The Li2 Co 0.75 Cu 0.25 Ti3 O8 electrode exhibited
high similarity to Li2 CoTi3 O 8 with a good reversible charge-discharge capacity and excellent
cycling stability. Li2 Co 0.75 Cu 0.25Ti3 O8 exhibited initial discharge capacity of 527 mAh g−1 , and
superlong stability performance of 98.75% coulombic efficiency.
In Chapter 4: The ability to prepare two-dimensional (2D) metal chalcogenide nanoflakes is
of great importance for the further exploration of their properties. In the light of this, my aim
in this thesis is to synthesize 2D metal chalcogenide nanoflakes and then explore their potential
applications in Li-ion batteries and supercapacitor