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Natural Graphite as Negative Electrode Material for Lithium-Ion Batteries
Paulovics, Petr ; Jahn, Michal (referee) ; Libich, Jiří (advisor)
This bachelor thesis deals with an issue of lithium-ion batteries. It is focused on the negative (anode) electrode materials, dealing with the study of their electrochemical properties. The aim was to study the capacity characteristics of active electrode materials based on natural graphite. Mainly it was assessed the relationship morphology electrode material and the pressing pressure due to the electrochemical properties of the capacitive electrode. The first part of the thesis contains a theoretical introduction to the negative electrode materials with focuses on the composition and overall analysis of the lithium-ion cell. The second part is focuses on the manufacture, assembly and measurement of lithium-ion cells.
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Expanded Graphite as Negative Electrode for Lithium-Ion Batteries
Bibik, Maria ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This bachelor’s thesis examines the issues related to the lithium-ion batteries and describes their basic elements, operating principle and technological parameters. It is focused on studying different materials for the negative electrode (anode) that is based on natural graphite. It describes in detail expanded natural graphite materials which are used as an active electrode material. This thesis describes experiments of the impact of the pressure force on power and capacity characteristics of the negative electrode in aprotic system of li-ion batteries.
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Infuence of Technological Parameters on Electrochemical Properties of Negative Electrode in Lithium-ion Cell
Kaňa, Michal ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This diploma thesis deals with lithium-ion batteries. It is focused on negative electrode on grafit based. The goal of this thesis is to show the problematics of lithium-ion batteries together with possibilities for improvement of their basic parametres as capacity and current elektricity loadability. The first part is focused on the description of functionality of lithiumion battery. The second part is practical and it is focused on production of negative electrodes from natural graphite 280H which has different thickness and compression pressure. The third part describes preparation of negative electrodes from natural graphite 280H and also includes results of measurement. In the last part are different types of negative electrodes from natural graphite 280H compared and evaluated including the determination of conclusions. This comparison and evaluation based on obtained data.
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Lithium-ion cell: Treatment of Natural Graphite by Lithiation Method
Bílek, Lukáš ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
This bachelor thesis deals with the issue of lithium-ion accumulators. The thesis focuses on the negative electrode of lithium-ion accumulator made of natural graphite. In the theoretical part the thesis focuses on the characteristics, the operating principle and the use of lithium-ion accumulators. Negative electrode materials are also analyzed. The main topic of the thesis is the use of lithiation method which suppresses irreversible capacity losses with the improvement of the capacitance and current characteristics of the battery.
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Expanded and Flake Natural Graphite as Negative Electrode Material in Lithium-ion Cell
Paulovics, Petr ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
This diploma thesis deals with an issue of lithium-ion batteries, primarily with negative (anode) electrode materials. Natural graphite in two forms, namely flake and expanded graphite, is used in the thesis as active electrode material. It is concerned with study of their capacity and output characteristics depending on the pressing pressure and discharging current. The first part of thesis consists of theory and describes basic principles and the composition of lithium-ion batteries. Materials, their characteristics used in production and theoretical description of measurement techniques are presented then. The second part of the thesis is focused on production, assembling and measurement of the characteristics of the produced electrodes. The aim of the thesis is finding the effects of changes of pressing pressure on the capacity, stability during cycling and stability at higher loads.
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Single wheel vehicle
Hanuš, Radek ; Boušek, Jaroslav (referee) ; Háze, Jiří (advisor)
The main aim of this thesis is to design and build a self-balancing vehicle similar to a skateboard, utilizing only one wheel located in the centre of the device. The steering will be controlled by driver‘s tilt and the ride will resemble snowboarding or surfing. The initial part focuses on a comparison between commercially available devices. Frequently used components and their main attributes are described in the next part. After that, a possible solution is outlined, followed by an electrical design and firmware‘s function explanation. Final build, its set-up and overall results are summarised in the last part of this thesis.
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Numerical model of Li-Ion battery temperature field by discharging
Novotný, Jakub ; Bílek, Michal (referee) ; Vyroubal, Petr (advisor)
This work is focused on lithium-ion batteries in general and their modeling capabilities in ANSYS Fluent. The various advantages and disadvantages of li-ion batteries are describes in my work. There are also described the various models and submodels offered by ANSYS Fluent. An essential part of the work is to model the real battery and compare the results between the real battery and the simulation itself. Finally, simulation of battery breakdown is performed.
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Workplace for measuring capacity and rate-capability characteristics of lithium-ion batteries
Cápal, David ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This master's thesis deals with the issues of lithium-ion batteries, describing common types of commercial lithium-ion batteries, their advantages, disadvantages, and characteristic properties. The thesis focuses in more detail on the influence of temperature on the characteristics of lithium-ion battery. The thesis describes the design and construction of a workplace for measuring capacity and rate-capability characteristics of lithium-ion batteries at low and high temperatures. The thesis also describes the implementation of a cooling and heating module using a system based on Peltier devices.
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Infuence of Technological Parameters on Electrochemical Properties of Negative Electrode in Lithium-ion Cell
Kaňa, Michal ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This diploma thesis deals with lithium-ion batteries. It is focused on negative electrode on grafit based. The goal of this thesis is to show the problematics of lithium-ion batteries together with possibilities for improvement of their basic parametres as capacity and current elektricity loadability. The first part is focused on the description of functionality of lithiumion battery. The second part is practical and it is focused on production of negative electrodes from natural graphite 280H which has different thickness and compression pressure. The third part describes preparation of negative electrodes from natural graphite 280H and also includes results of measurement. In the last part are different types of negative electrodes from natural graphite 280H compared and evaluated including the determination of conclusions. This comparison and evaluation based on obtained data.
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Lithium-ion cell: Treatment of Natural Graphite by Lithiation Method
Bílek, Lukáš ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
This bachelor thesis deals with the issue of lithium-ion accumulators. The thesis focuses on the negative electrode of lithium-ion accumulator made of natural graphite. In the theoretical part the thesis focuses on the characteristics, the operating principle and the use of lithium-ion accumulators. Negative electrode materials are also analyzed. The main topic of the thesis is the use of lithiation method which suppresses irreversible capacity losses with the improvement of the capacitance and current characteristics of the battery.
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