National Repository of Grey Literature 51 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Design of an integrated self-sufficient residential house
Klouda, Jan ; Jaššo, Kamil (referee) ; Libich, Jiří (advisor)
The thesis deals with the design of an integrated island system for control and power supply of a residential house. The aim of the thesis is to develop a design for this self-contained islanded power supply, and to evaluate the proposed system from different perspectives. The thesis is divided into two parts. The first part is made by researching the possible solutions of a self-sufficient power supply for a residential house. This research contains mostly available technologies in the Czech Republic, and deals only with the domestic market. In the first part, different relevant methods of electricity generation, processing and storage are described. Then, the different technologies are described in detail and compared in order to achieve the highest possible economic, environmental and social compatibility. In the second part, the different technologies are implemented on the defined house to create a design for a self-sufficient house. This design includes several simulations and the selection of the most appropriate technologies. The resulting design is also compared with an already built self-sufficient house.
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.
Temperature changes in different designs of lead-acid batteries
Langer, Martin ; Libich, Jiří (referee) ; Bača, Petr (advisor)
This diploma thesis deals with lead accumulators, the possibilities of their division and the basic reactions that take place inside taking into account the design features of individual types. Both exothermic and endothermic reactions taking place at the electrode-electrolyte interface, as well as the heating of the accumulator caused by Joule losses on its internal resistance, are then discussed in more detail. However, the charging reaction is also accompanied by other internal processes of the accumulator, which are related to electrolysis, recombination of water and polarization resistance. A calorimeter made of expanded polystyrene and a measuring center with external temperature sensors are used to quantify the degree of causation of temperature changes of individual processes. In the thesis, the rate of heat loss through the walls of the calorimeter is subsequently evaluated and used to calculate the total thermal energy during cycling.
Sodium-ion batteries: research of carbon-based negative electrode materials
Homolka, Tomáš ; Libich, Jiří
This paper is mainly focused on research of hard carbon as promising negative electrode material for sodium-ion batteries. The first part deals with batteries and their usage in general. The next section deals with sodium-ion batteries, their development and differences compared to lithium-ion, as they seem to be one of the promising post-lithium technologies with the potential of quick commercialization. The emphasis in this work is put on the negative electrode materials for sodium-ion batteries based on hard carbon as an active electrode material.
Sodium-ion batteries: research of carbon based negative electrode materials
Homolka, Tomáš ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This work focuses on the research of hard carbon as a promising negative electrode material for sodium-ion batteries. The first part deals with electrochemical cells and their development in general. Then lithium-ion cells, their history and the materials currently used are mentioned. The next section discusses sodium-ion cells, their development so far, current issues and differences compared to lithium-ion cells, as they appear to be one of the promising post-lithium technologies with the potential for rapid commercialization. In the practical part, properties of some material samples are tested with a focus on their capacity and coulombic efficiency.
Negative Electrode for Sodium-ion batteries
Šimek, Antonín ; Bača, Petr (referee) ; Libich, Jiří (advisor)
This master’s thesis is focused on the research of negative electrode materials for sodium-ion batteries. It contains a general introduction to the issue of batteries, their brief historical development, basic operating principles, key parameters and classification. Attention is paid to lithium-ion batteries, which are the most used technology today. Sodium-ion batteries as their potential replacement, especially in the field of energy storage from renewable sources, are based on lithium-ion technology. Promising candidates for the material for the negative electrode of sodium-ion batteries are sodium titanates. Their synthesis and subsequent electrochemical characterization of electrodes using sodium titanate as the active material are included in the practical part of this work.
Comparison of different types of commercial lithium-ion batteries and their properties under low temperature
Bičák, Tomáš ; Máca, Josef (referee) ; Libich, Jiří (advisor)
The diploma thesis deals with the issue of lithium-ion batteries. Describes development, technologies and materials used. The diploma thesis describes the operating principle, characteristics, advantages and disadvantages. The work is focused on the characteristic properties of commercial lithium-ion batteries under standard conditions and at reduced temperatures. At reduced temperatures, changes in properties due to low temperatures are observed. Furthermore, in this work they compare the measured values with the values given by the manufacturers.
The effect of temperature on the charging and discharging characteristics of lithium-ion batteries
Doleželová, Eva ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This thesis deals with operation principles of lithium-ion batteries, its degradation principles, capacity fade, materials used, formats, main characteristics, development, uses and mid to high temperature behaviour. The thesis aims to study aging characteristics of commercially available lithium-ion batteries. In the practical part of the thesis, the key parameters of selected types of commercially available lithium-ion batteries were measured under normal temperature conditions. The measurement was repeated at an elevated temperature. Results were analysed and effects of different temperatures on the selected characteristics were concluded both verbally and graphically. A conclusion evaluates short-term and long-term impacts of ambient temperature on rate capability, ageing, capacity fade and longevity.
Comparison of parameters of selected types of commercial lithium-ion batteries
Špina, Martin ; Libich, Jiří (referee) ; Bača, Petr (advisor)
This thesis deals with operation principles of Lithium-ion battery. It evaluates its characteristics, advantages, and disadvantages. Technological processes and materials used in manufacturing and recycling are also discussed. Practical part of the thesis evaluates initial capacity of given Li-ion cells at different loads. Batteries are then cyclically charged and discharged, and its capacity and other parameters are determined. Electrochemical impedance spectroscopy data are also taken and evaluated for batteries in new-like condition, used batteries and cycled batteries as the capacity fades.
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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3 Libich, Jan
3 Libich, Jan
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