|
|
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.
|
|
|
Modification of cathode material based on nickel and manganese for Li-ion cell
Bukáčková, Ivana ; Vondrák, Jiří (referee) ; Kazda, Tomáš (advisor)
This bachelor´s thesis deals with cathode materials for lithium batteries with cell voltage approaching 5V. The first part of the thesis is devoted to the characteristics of Li-ion batteries, electrochemical reactions and properties of electrode materials. She also pays attention to the preparation and measurement of materials LiNi0,5Mn1,5O4, LiNi0,45Mn1,55O4 and LiNi0,55Mn1,45O4. Observed material was measured by electron microscopy, elemental analysis and galvanostatic method,
|
|
|
Advanced carbon structures as a material for Na-ion batteries
Bečan, Jan ; Čech, Ondřej (referee) ; Kazda, Tomáš (advisor)
This diploma thesis deals with the description of individual types of batteries. The first part is focused to primary and secondary batteries, materials for their positive and negative electrodes with a focus on lithium-ion batteries and their changes over time. The next section focuses on a more detailed description of sodium-ion batteries, used electrode materials and to their problems. Practical part is focesed to preparing of electrode materials and to completing of measuring electrochemical cell and to discribing of measuring methodes and to evaluation of measured data.
|
|
|
Fuell cells
Sedláček, Tomáš ; Elcner, Jakub (referee) ; Hejčík, Jiří (advisor)
This bachelor thesis describes the distribution of fuel cells, principle of their operation and composition of the individual cell types. It states the advantages or disadvantages of the individual cell types and summarizes their basic parameters. This thesis also refers to the current state of development of fuel cells and convenient areas of their application.
|
|
| |
|
|
Advanced systems of Li-Ion accumulators
Lexová, Kristýna ; Langerová, Petra (referee) ; Mihai, Hana (advisor)
S rostoucí potřebou energie pro přenosnou elektroniku a elektrická vozidla se problematika úschovy elektrické energie stává stále významnější. Tato bakalářská práce poskytuje přehled elektrochemických zdrojů energie, a to zejména lithno-iontových akumulátorů a nejpoužívanějších materiálů pro kladnou elektrodu. Práce pojednává také o vývoji vysokonapěťových katodových materiálů, včetně systému lithium-síra. Experimentální část této práce popisuje zhotovení několika vzorků kladných elektrod, a porovnává jejich elektrochemické vlastnosti.
|
|
|
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.
|
|
|
Hydrogen fuel cells
Kejval, Dan ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The replacement of the current fuels and engines presents one of the most important tasks not only for vehicle manufacturers but also in the energy industry. Whole world is trying to limit the production of greenhouse gasses which pollute the environment and switch to sources that will not produce any harmful emissions as fast as possible. One of these are hydrogen fuel cells, which are the focus of the thesis and explains how hydrogen is produced and stored. It shows the principle on which they work, what designs currently exist and also evaluates their efficiency. According to temperature and material of the electrolyte they can be divided into various types which offer a wide range of performances and their use. Thanks to that, this device began to spread both in the Czech Republic, where the effort is to firstly expand public transportation to include busses using the hydrogen fuel cells and at foreign vehicle manufacturers where carmakers such Toyota and Hyundai already mass-produce passenger cars, trucks or buses with this source of electricity.
|
|
|
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.
|
|
|
Deposited layers based on lead and cobalt for Li-ion batteries
Dorotík, David ; Libich, Jiří (referee) ; Máca, Josef (advisor)
The diploma thesis deals with the principles of operation of lithium ion batteries and their properties when using deposited thin films. The thesis is mainly focused on the formation of thin films using the electrolytic method and subsequently testing the properties of the thin film in an electrochemical cell. The test criteria are mainly the value of the capacity of the prepared electrode and the impact of cycling on the electrode layer itself, where the deposited layer is assessed before cycling and after cycling on an SEM microscope..
|
guest ::
