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Supercapacitor cycling device
Hába, Roman ; Kunovjánek, Miroslav (referee) ; Dvořák, Petr (advisor)
The supercapacitor is a perspective electrical component reaching very large capacity. Currently is beeing worked on improving its parameters. These parameters are needed to test. Charging and discharging of the supercapacitor is theoretically fully reversible process. However, real supercapacitor accompanies ageing of the electrolyte and electrodes, lead to reduction of the capacity. The aim of this work is to design a device that expose supercapacitor to accelerated ageing, which will facilitate the assessment of ageing commercial and laboratory made supercapacitors.
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Charge Transport and Storage in a Supercapacitor Structure
Kuparowitz, Tomáš ; Zedníček, Tomáš (referee) ; Hájek, Karel (referee) ; Sedlák, Petr (advisor)
Práce se zabývá studiem superkondenzátorů (SC). Výstupem je detailní studie principů přenosu náboje ve struktuře SC, ukládání energie a nový náhradní model SC, který je založen na fyzikálních zákonitostech a principech SC. Dále byl vytvořen matematický model SC, který popisuje chování náboje v jeho aktivní vrstvě. SC byly testovány metodami umělého stárnutí. Závislosti poklesu parametrů SC vlivem různých metodik stárnutí jsou v práci shrnuty.
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Supercapacitor cycling device
Hába, Roman ; Háze, Jiří (referee) ; Dvořák, Petr (advisor)
The supercapacitor is a perspective electrical component reaching very large capacity. Currently is beeing worked on improving its parameters. These parameters are needed to test. Charging and discharging of the supercapacitor is theoretically fully reversible process. However, real supercapacitor accompanies ageing of the electrolyte and electrodes, lead to reduction of the capacity. The aim of this work is to design a device that expose supercapacitor to accelerated ageing, which will facilitate the assessment of ageing commercial and laboratory made supercapacitors.
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Materials for Supercapacitors
Dvořák, Petr ; Paidar,, Martin (referee) ; Trnková, Libuše (referee) ; Sedlaříková, Marie (advisor)
This dissertation deals with the electrode materials, liquid and gel electrolytes suitable for supercapacitors. In the field of electrode materials were investigated carbon materials based on carbon blacks, expanded and micronized graphite suitable for supercapacitors working on the principle electrochemical double layer. Another area which this thesis deals with are aprotic liquid electrolytes prepared from suitable types of salts and aprotic solvents. The last part is focused on the preparation and subsequent electrochemical characterization of gel polymer electrolytes in order to increase the ionic conductivity of these electrolytes.
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Electric buses
Forman, Tomáš ; Porteš, Petr (referee) ; Štětina, Josef (advisor)
This bachelor work is dealing with the topic of electric buses, especially from the point of view concerning the design of traction components within the vehicle. The first part of the thesis is concerned with the history and a gradual development of electric cars, especially electro buses. The second part contains the summary of the most commonly used supply chambers of electric energy; the suitability of the usage of types of these supply chambers is also mentioned. The attention is paid to the location of such supply chambers within the vehicle as well. The following chapter is dealing with the traction electric engines – their most commonly used types, and the end of the chapter is concerned with the most usual placement of such components in the vehicle with the list of plus and cons for individual kinds. In the fourth chapter are listed certain types of electric buses in the contemporary market, with the emphasis laid on the construction solution of individual producers. The last but one chapter contains the summary of what direction is the current market of electric buses moving to, and what is the current development of this field. The very last chapter is the practical one, where I am trying to show the simplified method when calculating the optimal capacity of the batteries needed for the chosen route of the electric bus.
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Modeling of electrical components vehicles
Kósa, Valentin ; Huzlík, Rostislav (referee) ; Havlíková, Marie (advisor)
Master’s thesis deals with the issue of electric vehicles. In thesis’s outset is overview about sources of electric power and types of electric engines applicable for electric vehicles. The main part of this document is creating model of vehicles with engine and source of power for them in Simulink. The resulting model includes models of ultracapacitor and synchronous motor with permanent magnets. Vehicles in model is presented by load of electric engine. In last part of document are executes ride simulations on the model which was created and subsequently simulations are analyzed.
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Porosity increasing agents for supercapacitors
Hovorka, Martin ; Dvořák, Petr (referee) ; Sedlaříková, Marie (advisor)
This work deals with questions connected with ultracapactors and lightening agents of activated carbon used for production of supercapacitors’s electrodes. Our goal was examination of ideal ratio of carbon and lightening agent in surveyed electrode. Materials which were used: expanded graphite, soda saleratus, ammonium bicarbonate and ammonium formate. Specimens were measured by cyclic voltammetry. The best results was reached by using of soda saleratus with ideal ratio 1:0,5. During measurement was found that weight of electrode has basic effect on eventual capacity.
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Electric buses
Forman, Tomáš ; Porteš, Petr (referee) ; Štětina, Josef (advisor)
This bachelor work is dealing with the topic of electric buses, especially from the point of view concerning the design of traction components within the vehicle. The first part of the thesis is concerned with the history and a gradual development of electric cars, especially electro buses. The second part contains the summary of the most commonly used supply chambers of electric energy; the suitability of the usage of types of these supply chambers is also mentioned. The attention is paid to the location of such supply chambers within the vehicle as well. The following chapter is dealing with the traction electric engines – their most commonly used types, and the end of the chapter is concerned with the most usual placement of such components in the vehicle with the list of plus and cons for individual kinds. In the fourth chapter are listed certain types of electric buses in the contemporary market, with the emphasis laid on the construction solution of individual producers. The last but one chapter contains the summary of what direction is the current market of electric buses moving to, and what is the current development of this field. The very last chapter is the practical one, where I am trying to show the simplified method when calculating the optimal capacity of the batteries needed for the chosen route of the electric bus.
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Supercapacitor Parameters Dependence on Charging Duration
Kuparowitz, Tomáš
Supercapacitor (SC) parameters dependence on charging time is analyzed for Nesscap 2.7V / 10F. Charging was performed using constant current in the range from 0.5 A to 5 A. Reciprocal capacitance (C-1) was calculated. It linearly decreases with applied charge. During SC charging, the effective distance of charges on electrode-electrolyte interface decreases, due to the charge distribution being altered by mobile ions inside electric field. Ions are at first moving by drift, and then by diffusion processes. Effective thickness of electrolyte negative charge is determined from reciprocal capacitance. The effective thickness varies between 2.6 nm and 2.1 nm.
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