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Determining the health status of the primary Li cell
Černík, Michal ; Vanýsek, Petr (referee) ; Bača, Petr (advisor)
This paper discusses the issue of determining the health and state of charge of cells and batteries. These parameters are an important component in all applications involving cells and batteries, in terms of their effectiveness and protection of personnel and the cells themselves. The method of electrochemical impedance spectroscopy, the method of relaxation time distribution and the design of an equivalent replacement circuit are explained and implemented in detail. LiSOCl2 type primary cells were used to implement these methods. The results demonstrated the functionality of the relaxation time distribution method and pointed out the shortcomings of the equivalent replacement circuit design method.
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Functional TiO2 layers on fiber structures
Bečár, Tomáš ; Chladil, Ladislav (referee) ; Bača, Petr (advisor)
This thesis deals with the formation of functional layers on fibrous structures. The aim of the thesis is to deposit a titanium dioxide film on glass fibres for its use as an additive in lead acid batteries. The work includes a survey of methods of titanium dioxide deposition on glass substrate, a review of measuring and recording equipment and a structural analysis of the materials used. As a result of the work, experiments of titanium dioxide deposition on filter paper and glass fibers will be developed along with their analysis. The evaluation of the analyses will be followed by a proposal for the use of these functional layers in possible applications.
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Changes in the composition of the company's fleet in relation to the EU's "green deal" objectives
Tobiášová, Eliška ; Jandová, Kristýna (referee) ; Bača, Petr (advisor)
The purpose of this master thesis is to examine the so-called Green Deal and the related directives and regulations that are intended to help achieve the objectives set out in the Green Deal, as well as to analyse the fleets of the Member States of the European Union and the company with which cooperation has been established as part of this work. The thesis describes the Green Deal and its objectives. The European Union directives and plans with the aim of reducing CO2 that are currently approved or are yet to come into force are also mentioned, while at the same time they are compared with the directives and targets in force in the EU Member States, including the Czech Republic. In the following chapters, a brief description of the cars by type of fuel is given in order to follow a detailed analysis of the fleets of Germany, Sweden, Spain, Slovakia, France, Poland and the Czech Republic. This analysis is carried out using graphs and official statistics available from government institutions. Furthermore, an analysis of the company's fleet is made, summarising in tables the parameters of the vehicles available to the company. The results of the fleet analysis are also summarised in graphs based on the year of vehicle manufacture, emissions, and fuel type. In addition, an analysis of hybrids and electric vehicles currently in the company's fleet is also provided. This analysis works with data provided by the company and examines the cost of driving these vehicles, consumption, and battery usage ratio. Finally, a suggestion is made for the replacement of the current vehicles with the aim of saving emissions.
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Preparation of a laboratory exercise focusing on hydrogen energy storage
Mistrová, Jana ; Vanýsek, Petr (referee) ; Bača, Petr (advisor)
This diploma thesis describes the preparation of a laboratory experiment focused on hydrogen storage capacity. The experiment deals with hydrogen production, fuel cells, the evaluation its efficiency and hydrogen consumption within a fuel cell. The first part of the thesis is devoted to the energy storage systems, particularly chemical energy storage and hydrogen production. The next part explores fuel cell technologies. Following this, the thesis describes the experiment's preparation, equipment, and fuel cell activation. The final part focuses on the laboratory materials and the report.
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Functional carbon layers on fiber structures
Opravil, Petr ; Čech, Ondřej (referee) ; Bača, Petr (advisor)
In this master‘s thesis, we will be informed about creation of carbon coatings on glass fibre structures. Described methods of carbon coating will be compared and we will chose appropriate method for available laboratory in constitution of electronic technologies. Thanks to it’s low price and simplicity, it was firstly chosen to test carbon deposition using dehydration of sugar using concentrated hydrochloric acid. Results of initial experiments helped to develop and propose new methods that were tested using multiple new microfiber samples. Results from these experiments helped choose a correct subtrate on which a function layer of carbon was deposited and later analyzed.
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Analyse of photovoltaic solar cells by the photoluminescence method
Baura, Tomáš ; Bača, Petr (referee) ; Vaněk, Jiří (advisor)
This thesis deals with the analysis of solar cells by photoluminescence method. Photoluminescence method is based on the excitation of luminescence radiation of the solar cell material by an external excitation light source. This method can detect various types of defects in the material solar cells. The main objective is the design and realization of a measuring system defects of solar cells, which is based on this method. For excitation of luminescence is used LED array. For the detection of luminescence is used CCD camera with IR optical filter. To filter out the excitation light radiation is used disc screen and optical interrupter. The parameters and options of this measuring system are verified and characterized by test measuring for example the achievable rotation speed of screen and response of optical interrupter. At the end is tested detection of luminescence radiation of solar cells in the measuring system. The measured images are compared with the method of electroluminescence.
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Using of X-ray for distribution analysis of electrodes for secondary cell application
Macháč, Milan ; Bača, Petr (referee) ; Chladil, Ladislav (advisor)
This diploma thesis is focused on in-situ analysis of the composition of the negative electrodes of second secondary cells with using X-ray radiation. The first part is dedicated to the theory of lead accumulators, including charging, discharging, battery components and individual degradation mechanisms. The main part of the thesis includes the preparation of electrochemical in situ XRD cells and following measurement of the growth of lead sulphate crystals on the OCV potential. Furthermore, the lead cell was subjected to the measurement of the cyclic voltammetry around the working point of the negative electrodes. From these measurements was evident gradual increase of the lead sulfate crystals. The analysis was supplemented with electron microscopy images. In addition, were evaluated the in-situ particle analysis of the LTO Sigma sample.
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Carbon materials for power sources
Tichý, Jiří ; Bača, Petr (referee) ; Novák, Vítězslav (advisor)
This work deals with carbon materials and using them in electrochemical energy sources. Object of this work was to prepare carbon materials and investigate their electrical properties. The theoretical part objects of the carbon materials, their properties, application in electrochemical energy sources and measurement methods used in experimental part. Experimental part describes the preparation of the electrodes with various carbon materials and summarizes the results of measurements.
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Electrochemical Properties of Lithium-Ion battery under Elevated Temperature
Kulíková, Barbora ; Chladil, Ladislav (referee) ; Bača, Petr (advisor)
This Master’s thesis deals with a monitoring of the temperature influence on Li-ion batteries, literature search of this topic and proposal of experiments. First chapter contains the theory of evolution and fundamentals of the Li-ion batteries. Planned experiments with flow charts and block diagrams are described in the second chapter. The work station is explained along with a description of the execution of the experiments in the third chapter. The experiments are analyzed and results explained in the last chapter.
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