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Binders for supercapacitors electrodes
Gottwald, Tomáš ; Dvořák, Petr (referee) ; Sedlaříková, Marie (advisor)
This work deals with the issues of useing binders for supercapacitor electrodes and optimizing the technological process for their production. The work focuses on optimizing the amount of binder used in order to acheive the most capacity. The methodology consists of creating an appropriate experimental electrode and subsequent measuring its associated capacity with AutoLab. This aproach leads to creating grafs which show the dependencies of capacity on the amount of binder used.
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Lead-acid battery formation
Hlaváč, Pavel ; Tošer, Pavel (referee) ; Vaculík, Sebastian (advisor)
This bachelor project deals with the pulse charging of lead-acid batteries and ways of formation of electrodes so that the new batteries can constantly offer high performance and efficiency for its life. The work is an attempt to compare and determine whether the formation of different charging modes will not have a major impact on the quality of a formed battery. The formation of the different modes uses both the pulse and continuous charging. Everything is tested on four manufactured articles. The production of positive electrode and formation of accumulator is processed in various chapters of my project at our workplace.
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Workplace for measuring electrochemical potential of metals
Cápal, David ; Kazda, Tomáš (referee) ; Libich, Jiří (advisor)
This bachelor's thesis describes the issues related to corrosion in electrical engineering. Thesis describes corrosion itself, historical mentions and causes. It also deals in deatail with electrochemical corrosion and the behavior of ions at the electrode-electrolyte interface together with the redox processes that accompany them. This thesis describes the origin and use of these electrochemical reactions as a way of creating electrochemical potential in liquid electrolytes at the metal-electrolyte interface. Thesis also describes measuring methods and evaluation of measured results using polarization curves and Tafel diagrams.
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The LiOh influence in alkaline accumulators
Marušarz, Anton ; Čech, Ondřej (referee) ; Pléha, David (advisor)
The goal of this bachelor´s thesis project is to explain the influence of lithium hydroxide on nickel accumulators, on their positive electrode. This project describes several different kinds of avaliable accumulators, mainly nickel-cadmium accumulators. In the next couple of chapters I will be describing their positive electrode, cyclic voltammetry and influences of different additaments on positive electrode. Last part is dedicated to experiments of the cyclic voltammetry with different solutions and tempratures. Comparing these characteristics and evaluating influences of different variables on these measurments is main goal of this thesis.
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The influence of zinc ion on possitive elektrode of Ni-Zn accumulators
Karásek, Stanislav ; Novák, Vítězslav (referee) ; Chladil, Ladislav (advisor)
This thesis deals with the establishment of zinc ions at the positive electrode of nickel-zinc batteries. The aim of the study was to measure the impedance characteristics of the positive electrode in various states of charge and observing the effect of ZnO on the changes of impedance spectra. The theoretical part is focused on nickel hydroxide as a construction material for positive electrode and its behavior during cycling in the electrolyte. The experimental part describes in detail the manufacture of the electrode system and the preparation of electrolytes with different degrees of saturation with zinc oxide. The cells were cycled and measured using impedance spectroscopy. The measured impedance curves were simulated with equivalent circuits for a better understanding of the ongoing processes.
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Electrode materials based on lithium titanate oxide for lithium-ions accumulators
Kaválek, Ondřej ; Vondrák, Jiří (referee) ; Jirák, Tibor (advisor)
The bachelors thesis deals with researching electrode materials based on Li4Ti5O12 for lithium-ions accumulators. The work is divided into two areas – teoretical and practical part. Teoretical part is aimed at electrochemical power sources with focusing on lithium-ions accumulators. Consenquetial part is concentrated on electrochemical processes and analysis of researching samples Li4Ti5O12. Observed material was measured by galvanostatic method, cyclic voltammetry, impedance spectroskopy and electron microscopy. Aim of the work was obtaining characteristics of electrode material and finding out usability of the material in lithium-ions accumulators.
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Study of stability of electrolytes and electrodes by electrochemical methods
Bukáčková, Ivana ; Čech, Ondřej (referee) ; Kazda, Tomáš (advisor)
This master´s thesis deals with stability of electrolytes and electrodes using electrochemical methods of Li-ion batteries. The first part of the project is devoted to the characteristics of Li-ion batteries, electrochemical reactions and characteristics of electrode materials. Consenquetial part is concentrated on preparation and measurement of elektrolyte EC : DMC with 1M LiPF6. The elektrolyte was investigated using galvanostatic method, cyclic voltammetry and impedance spectroscopy.
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Optimization of process of preparing graphite electrodes with a layer of lead dioxide
Doros, Stanislav ; Vomáčková, Alena (referee) ; Pilátová, Ivana (advisor)
My study is focused on describing of complex electrochemical methods of preparing of graphite substrate lead dioxide anodes. The theoretical part is devoted to characterization of different parameters which influence the quality (morphology and composition) of the coating. In the experimental part are described the procedures of preparing of the graphite anodes with the lead dioxide coating. In the results are specified the best parameters for which permits the anode to resist high current densities. The whole process consists of substrate treatment, adjustment of current density, period of electroplating and the optimal thickness of plating, control of pH and temperature of solution, additives, rotation of electrode. The lifetime was tested by electrolysis of a potassium chloride water solution for 5 hours by applying 18 A/dm2, the mass of electrode after drying remained constant.
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