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Compatibility of negative electrode materials at system of lithium-ion battery
Šikuda, Milan ; Sedlaříková, Marie (referee) ; Libich, Jiří (advisor)
This thesis deals with a study of lithium-ion batteries. It is focused into negative electrode materials and electrolytes. In this thesis is presented synthesis, electrochemical properties, possibilities to improving negative electrode materials as LTO (Lithium Titanate Oxid) and graphite. These electrode materials were investigated with respect to their compatibility at electrolytes with carbonate solvents, Sulfolane and DMF (DiMethylFormamide) in detail. The main aim of this thesis is to characterize electrode materials and electrolyte properties depending on wide range of temperatures and their comparison for the purpose of achievement of the best solution. The thesis is divided into two main parts. The theoretical part of thesis describes composition, process of synthesis and analysis of lithium-ion cell. Practical part contains measuring and evaluating of charge-discharge and irreversible capacity characteristics related to variety of environmental temperatures.
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Development of negative electrodes for lithium-ions batteries
Drahokoupil, Petr ; Libich, Jiří (referee) ; Sedlaříková, Marie (advisor)
This thesis deals with lithiation of negative electrode li-ion batteries. In this thesis is used several electrode materials: carbon, FeCl3, lithiated carbon electrodes and silicon carbide. Reduction of irreversible capacity lithium-ion batteries leads to increased capacity and also we can use new materials as a positive electrode. Thesis deals with the differences in the properties of materials using lithiation and their use in practice
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Carbon materials for power sources
Tichý, Jiří ; Bača, Petr (referee) ; Novák, Vítězslav (advisor)
This work deals with carbon materials and using them in electrochemical energy sources. Object of this work was to prepare carbon materials and investigate their electrical properties. The theoretical part objects of the carbon materials, their properties, application in electrochemical energy sources and measurement methods used in experimental part. Experimental part describes the preparation of the electrodes with various carbon materials and summarizes the results of measurements.
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Carbon Based Materials
Hrazdíra, Matěj ; Čelko, Ladislav (referee) ; Klakurková, Lenka (advisor)
The proposed bachelor thesis deals with carbon based materials. First of all, an overview of its allotropic modifications including newly discovered forms, conditions of their existence and also their basic properties is shown. Further the extraction of carbon materials is briefly introduced. In the next chapters, forms of carbon are classified and particularly described individually with respect to manufacturing technologies and further applications. Individual chapters are dedicated to synthetic carbon and graphite, carbon fibers and carbon fiber reinforced composites. Manufacturing processes of synthetic carbon and graphite, involving possible precursors, are described in detail together with their use in various engineering applications. The following part is dedicated to carbon fibers, in particular to the manufacturing process based on the precursor used including surface treatment and sizing. Additionally the use of virgin carbon fibers is also described. The last part is focused on carbon fiber reinforced composites. Firstly possible distributions of carbon fibers in a matrix are described. Then the technology of manufacturing, properties and use of single composites according to the matrix material are expounded.
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Historical development of wooden pencil
SCHWARZOVÁ, Alena Nela
The work "Historical development of wooden pencils" I deal primarily with the history of the development of the wooden pencils, describing the development of production and the world's biggest Czech producers. Also describe the current production technology and raw materials used in the manufacture of graphite and cosmetic pencils and crayons.
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Strategic Analysis of KOH-I-NOOR GRAFIT, s.r.o.
Hejduková, Markéta ; Dvořák, Jiří (advisor) ; Soroka, Stanislav (referee)
The aim of this thesis is to elaborate a strategic analysis of the company KOH-I-NOOR Grafit, s.r.o., on this basis set vision and conceive a strategy suggestion. Principal methods of external analysis are PEST analysis and Porter's 5-forces model, in internal analysis are used analysis of internal sources and financial analysis. The next method is SWOT analysis, which sums up and interconnects the most important findings of previous analyses; on this ground is set a strategy of a chosen company and suggest a strategy.
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History of Graphite Mining in the Šumava Region
MILICHOVSKÁ, Kateřina
The area covered in my diploma work is in the geomorphologic complex of the Šumava Mountains, in the diverse moldanubic zone. This work describes natural conditions of the entire area and its specific locations, including particularly the graphite mines in the surroundings of the village of Černá v Pošumaví and the hamlets of Bližná and Mokrá. These deposits are situated in the former district of Český Krumlov. In the past, mainly in the late 19th century and during the First World War, the mines in this area were without any doubt some of the biggest and richest places of deposit in the world. Numerous graphite vein deposits were discovered in the area with high content of quality material which was exported to many parts of the world. After the First World War mining here was in decline due to gradual growth of costs and increased production of other competing graphite mines worldwide. Another event which contributed to the downfall of mining in some abundant locations was also the construction of Lipno I. dam. In Bližná mining continued until the end of the 20th century when it was terminated in 1998. High quality water is drawn there today. The present work also deals with the methods of graphite processing and its use. A dictionary is attached here for better understanding of some expert geological terms.
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Voltammetric Behavior of the Heterogeneous Graphite Composite
Šebková, Světlana
Graphite composite electrodes offer high chemical inertness, which is accompanied by a wide range of working potentials (the widest range of potentials was obtained using CE30 in borax buffer - almost 4 000 mV). Graphite composite electrodes find the field of application mostly in the work in the area of considerably positive potentials (e.g. oxidation of adenine, guanine, aminonaphtalene, etc.), and they offer unique possibilities analytical measurements.
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