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Optimization of Electrode Preparation Technology for Lithium-Ion batteries
Zahálka, Patrik ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This bachelor thesis deals with technological parameters of electrode production proces optimization for lithium-ion batteries. The thesis focuses on the negative electrode based on natural graphite. The first part presents a brief introduction to lithium-ion batteries and current status research. In the theoretical part the thesis focuses on the study of the structural and electrochemical properties of natural graphite and the operating principle of lithium-ion accumulator. The practical part solves optimization of electrode parameters, pressing pressure and electrode layer thickness. The capacitive and current characteristics of electrodes based on natural graphite have been analyzed and compared to the process parameters mentioned above.
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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.
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Analysis of critical parameters of the batteries for space applications
Šimek, Michal ; Šedina, Martin (referee) ; Kazda, Tomáš (advisor)
This thesis deals with the use of lithium-ion batteries for space applications. Primary and secondary electrochemical sources and their comparison are described in the paper. The main part of this work deals with lithium-ion batteries, their history, properties and used materials, deals with the use of li-ion batteries for space applications in terms of temperature and describes the effects of temperatures on li-ion batteries. At the last chapter deals with a lithium plating and his detection. In the practical part, a methodology for the detection of cast plating is proposed, which I then test on a number of cells, which I measure at various practical workloads.
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Bms Settings Analysis
Klusáček, Jan
Operation and performance of lithium-ion batteries strongly depend on configuration of Battery Management System (BMS). Set parameters must ensure both safe and efficient operation of the battery and it must be coordinated with specific operation profile of connected power converter. Whereas safe operation should be provided by safety assembly controlled by BMS, the efficient operation is mainly provided by superior system through connected converter. The configuration profile of battery is presented, its communication with energy system by Victron via CAN bus is evaluated, resulting performance of the system is examined and potential limitations are highlighted. A battery safety assembly for educational purposes is presented.
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Alandering Of Li-Ion Electrodes And Its Im-Pact On The Final Capacity Of Lithium-Ion Cell
Svoboda, Lukáš
There is an effort to produce lithium-ion batteries with maximal density of energy, or higher capacity of cell with the same size. Calendaring of electrodes is important part of manufacturing of batteries. Its parameters, mainly the pressure of calendaring and with it related the final compression ratio of electrode layers, affect parameters of battery significantly. It is the process of pressing electrode material coated on current collector with certain pressure and it reduces its porosity and thickness. The aim of this article is determination of suitable level of calendaring that increases specific capacity, but does not reduce its cyclability.
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Influence Of Ambient Temperature On Electrochemical Parameters Of Lithium-Sulfur Batteries
Jaššo, Kamil
With the increasing popularity of electric vehicles, the demand for their range is increasing and thus demand for the batteries that power them. Range of current electric vehicles using Li-ion battery technology is around 250 miles (400 km). In the case of use of new prospective next-gen batteries such as Lithium-sulfur (Li-S) range of the electric vehicle may be doubled or even tripled. However, there are many challenges ahead of using these batteries in electric vehicles. Since the batteries in electric vehicles are largely affected by ambient temperature, this article deals with researching the effect of ambient temperature on lithium-sulfur batteries.
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Influence Of Ambient Atmosphere To Active Material Of Disassembled Li-Ion Accumulator
Karmazinova, Katerina
At the present time the worldwide hot topic is recycling. How to deal with the product at the end of its life cycle? This paper is focused on recycling of active cathode material of lithiumion accumulators. The research considers the influence of ambient atmosphere on different types of lithium-ion accumulators within a time period. As the recycling method was chosen the solvent extraction. The results show a comparison of two the most common used cathode materials for lithium-ion accumulators – LiCoO2 and LiMn1/3Ni1/3Co1/3O2. At the forefront is the time period from disassembly the lithium-ion accumulator to extract cathode active material without structure changes due to the effect of the air atmosphere.
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Study of intercalation properties of electrode materials based on naturla graphite
Bílek, Lukáš ; Máca, Josef (referee) ; Libich, Jiří (advisor)
This diploma thesis deals with the issue of lithium-ion accumulators. The thesis focuses on the negative electrode of lithium-ion accumulators made of natural graphite. The first part of this thesis points to the issue of electrochemical cells. In the theoretical part the thesis deals with the SEI layer, advantages, disadvantages, characteristics, operating principle and the use of lithium-ion accumulators. The practical part focuses on the electrochemical properties of negative electrode, especially the determination of the diffusion coefficient. Thesis also deals with electrochemical impedance spectroscopy (EIS) and its use in determining the equivalent replacement circuit and calculating the diffusion coefficient.
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Evaluation Of Temperature Influence on Lithium-ion Battery Properties
Zachová, Zuzana ; Libich, Jiří (referee) ; Bača, Petr (advisor)
This diploma thesis deals with monitoring of the influence of temperature on the properties of lithium-ion batteries, especially on the safety and capacity of selected batteries. Chapters 1 and 2 contain a literature review on the subject, describing electrochemical energy sources, especially secondary accumulators, mainly lithium-ion cells. Furthermore, the safety and degradation processes of lithium-ion batteries are discussed and the third chapter describes the design of experiments, realization and outputs of these experiments.
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Study of intercalation properties of electrode materials based on expanded graphite
Vencelides, Lukáš ; Máca, Josef (referee) ; Libich, Jiří (advisor)
The diploma thesis deals with the issue of electrochemical cells and deals in detail with lithium-ion batteries. The thesis describes the history of development of lithium-ion batteries, basic information about lithium and basic types of electrochemical cells. The work is devoted in detail to the description of characteristics and operating principle of lithium-ion batteries with emphasis on the negative electrode and negative electrode materials. Of the negative electrode materials, both the most widely used material graphite and modern materials with a great potential for the future are described. In the measurement methods the work describes methods CV, GCPL and EIS. Great emphasis is placed on the explanation of the principle of the function of electrochemical impedance spectroscopy and its application in measurement of electrochemical properties of materials used in lithium-ion batteries. There is also described the procedure of calculation of diffusion coefficients using the results of electrochemical impedance spectroscopy. In the practical part, two methods are used to calculate the diffusion coefficients of lithium ions into the negative electrode made of expanded flake graphite using the results of a series of electrochemical measurements.
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