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Recovery Of Anode Material From Lithium Ion Batteries
Báňa, Jiří ; Kazda, Tomáš
As the production of lithium-ion batteries (LIB) is growingat a meteoric pace with the advent of electromobility. There willbe a need for efficient use of recycling processes, which nowfocus mainly on selected metals. Direct recycling is a methodwith great potential due to its simplicity, ecological friendliness,and high efficiency. However, this method needs to be improvedand put into practical use. In this paper, it is focused thesimulation of LIB aging, composition analysis and then recoveryof the anode material of Motoma LFP 18650 and PanasonicNCR18650B batteries.
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History of EVs and measuring battery under external force.
Šedina, M. ; Kazda, T.
This article describes the modern history of electromobility with the prediction of its market growth and the drivers of change. There are mentioned Li-ion battery's anode materials with their basic parameters and one of the conversion materials, silicon, which represent one of the possible materials for enhancing the capacity of the anode. Usage of the Si opens a few problems which are unnoticeable with actual anode materials, but there are some possible ways how to solve them. One of their solutions could be external force applied on the battery surface, which should reduce inflation of the battery and improve internal conduction.
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Multiscale Modelling of Li-Ion Battery Volume Expansion
Mačák, M. ; Vyroubal, P.
Mechanical characteristics of Li-ion batteries play an important part in the design of electric devices or energy storage systems. Proper mechanical design can increase the safety and the longevity of devices. Apart from external forces, Li-ion batteries also experience internal volume changes due to inherent physical processes, especially volume changes caused by intercalation and deintercalation of lithium ions into electrode materials. Currently, these changes are mainly studied experimentally using complex methods, while numerical simulations of these processes are surprisingly rare. This works presents different numerical approaches for studying internal volume changes in Li-ion batteries. The results show that it is possible to study volume changes at different length scales, but it is necessary to apply a suitable simplification of the model to obtain macroscopic deformation.
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Recovery Of Cathode Material From Li-Ion Batteries
Guricová, Patrícia
This article focuses on the possibilities of recycling materials from spent Li-ion batteries,especially on direct recycling. Lithium-ion batteries (LIBs) are gradually replacing other types ofaccumulators from practical applications and further increase in their production is expected in thefuture. With high production, bigger amount of waste will have to be deal with. Recycling processescurrently in use are not efficient enough and they have been developed mainly for one type ofcathode material. Direct recycling is very promising in terms of efficiency, but it needs to be furtherenhanced. Direct recycling technology is discussed in the text as well as the recovery processfor commercial Samsung 18650B-20R aged cell using different kinds of solvents.
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RGB fotosvětlo
Macek, Jan ; Fiedler, Petr (oponent) ; Baštán, Ondřej (vedoucí práce)
Bakalářská práce se zabývá návrhem efektového světla pro použití ve fotoateliéru. V práci je proveden průzkum trhu, jsou stanoveny požadavky na zařízení a následuje seznámení s danou problematikou. Dále se práce zabývá návrhem jednotlivých komponent, konstrukčním řešením a implementací software pro zvolený mikrokontrolér ESP32. Závěr práce je věnován testování a zhodnocení dosažených výsledků.
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Model Li-ion akumulátoru
Loucký, Vojtěch ; Toman, Marek (oponent) ; Cipín, Radoslav (vedoucí práce)
Tato diplomová práce se zabývá seznámením s principem Li-ion článků, provedením literární rešerše na téma matematické modely Li-ion článků a tvorbou vybraného matematického modelu v programu MATLAB, který je schopen simulovat průběh napětí a stav nabití v závislosti na čase, a to za různých podmínek baterie, jako je například stárnutí baterie. Je zde popsána tvorba jak modelu, tak postup identifikace parametrů nezbytných pro tvorbu modelu, včetně různých variant identifikace parametrů. Vybraný Theveninův model je následně srovnán s reálným průběhem a je zhodnocena přesnost modelu vůči měřenému průběhu a jeho silné a slabé stránky.
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Design of Portable LED Worklight
Válent, Réka ; Rubínová, Dana (oponent) ; Sládek, Josef (vedoucí práce)
This bachelor's thesis deals with the design of a portable LED work light. The aim was to design a simple, modern and aesthetic shape. Emphasis was placed on the continuous adjustment of the light angle and on the stability of the product on uneven surfaces. The project deals with the analysis of the current market, basic technical and ergonomic parameters and the description of the final solution.
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Studium vlivu modifikace separátorů na vlastnosti Li-S akumulátorů
Řehák, Petr ; Jaššo, Kamil (oponent) ; Kazda, Tomáš (vedoucí práce)
Tato diplomová práce se zabývá vývojem a současnou problematikou Li-ion a Li-S akumulátorů, především separátorů. V teoretické části je popsána historie Li-ion akumulátorů, jejich vlastnosti a materiály pro kladnou elektrodu. Dále jsou v práci popsány Li-S akumulátory a jejich problematika. V praktické části byly popsány elektrochemické metody, a bylo vytvořeno několik vzorků separátoru s různou modifikací. Tyto vzorky byli následně nafoceny pomocí elektronového mikroskopu SEM a vyhodnoceny pomocí elektrochemických metod.
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MPPT driver for small UAV
Košút, Martin ; Záplata, Filip (oponent) ; Kubíček, Michal (vedoucí práce)
This thesis describes a design of a maximum power peak tracking controller for a solar cell array embedded on a wing of a UAV. Solar cells are used to both cover part of the UAV power consumption and (at suitable conditions) to charge onboard battery. As the UAV changes its position and attitude to the sun relatively fast, the lighting conditions on the solar cells change rapidly. Thus, it is necessary to implement a fast maximum power peak tracking regulator to ensure maximum efficiency of the system. The proposed design is based on commercial offtheshelf components. The implemented DC/DC converter, which represents the core of the regulator, is a combination of a stepup and a stepdown converter. Weight, dimensions end overall efficiency were the key optimization parameters of the design.
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Conductivity Of Lithium Perchlorate Salt Dissolved In Different Types Of Solvent
Gottwald, Tomas ; Vondrák, Jiří
Lithium perchlorate (LiClO4) is usable crystalline salt for electrolyte in a rechargeable lithium ion battery (LIB). LiClO4 is an inorganic compound with white color. In the present study the conductivity and the electrochemical behavior of electrolytes based on LiClO4 was examined by using impedance spectroscopy (EIS) and linear voltametry (LSV) measurement at a room temperature. The resistance (conductivity) of electrolytes with different molar concentration of LiClO4 dissolved in different types of the solvent was measured in the first part of this work. In the second part electrochemical behavior of two electrolytes with the highest conductivity was measured and evaluated by using a potential window. At the end the sodium perchlorate NaClO4 (for NIBs) was measured in this study too.
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