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The model-aided cathode design for lithium ion batteries is presented, which enables a systematically minimization of loss processes and an increase of power and energy density. The cathode model is parametrized without values from literature by combining microstructure analysis via FIB/SEM tomography and electrochemical impedance spectroscopy and finally validated.

microstructure --- modeling --- Mikrostruktur --- Elektromobilität --- Impedanz --- impedance --- Kathode --- cathode --- lithium-ion battery --- Lithium-Ionen Batterie --- microstructure --- modeling --- Mikrostruktur --- Elektromobilität --- Impedanz --- impedance --- Kathode --- cathode --- lithium-ion battery --- Lithium-Ionen Batterie

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This thesis introduces (i) amendments to basic electrochemical measurement techniques in the time and frequency domain suitable for electrochemical energy conversion systems like fuel cells and batteries, which enable shorter measurement times and improved precision in both measurement and parameter identification, and (ii) a modeling approach that is able to simulate a technically relevant system just by information gained through static and impedance measurements of laboratory size cells.

Lithium-Ion Battery (LIB) --- Solid Oxide Fuel Cell (SOFC) --- Electrochemical Impedance Spectroscopy (EIS)

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The model-aided cathode design for lithium ion batteries is presented, which enables a systematically minimization of loss processes and an increase of power and energy density. The cathode model is parametrized without values from literature by combining microstructure analysis via FIB/SEM tomography and electrochemical impedance spectroscopy and finally validated.

microstructure --- modeling --- Mikrostruktur --- Elektromobilität --- Impedanz --- impedance --- Kathode --- cathode --- lithium-ion battery --- Lithium-Ionen Batterie

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This work aims to understand the environmental impacts of recycling graphite from spent lithium ion batteries to battery grade graphite with the help of life cycle assessment study and compares it to the production of virgin battery grade graphite with the electricity mix of Germany and China. The results show that recycling reduces around 5 times the CO2 produced per kg as compared to production of virgin battery grade graphite and is even more when compared to other author’s results. With too small to even negligible production of graphite in the European Union, its current and future production is discussed along with the option of recycling from various waste streams which could be a potential solution to contribute to the future demand of graphite. Also, all the life stages of graphite are discussed in this study including their biggest reserves, price, applications and supply chain.

Environmental impacts --- Life cycle assessment --- Graphite --- Recycling --- Lithium ion battery --- Ingénierie, informatique & technologie > Géologie, ingénierie du pétrole & des mines

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In order to understand the current-voltage behaviour of a Lithium-Ion Battery, its impedance needs to be investigated in the low-frequency domain. This work deals with measurement, modelling and model validation in that low-frequency domain and introduces the Distribution-Function-of-Differential-Capacity (DDC) as a new tool for investigating capacity contributions of different particle sizes and particle types inside of a Lithium-Ion Battery.

Lithium-Ion-Battery --- Lithium-Ionen-Batterie --- Distribution Function of Differential Capacity (DDC) --- Impedanz --- Batteriemodell --- Low-Frequency --- Verteilungsfunktion der differentiellen Kapazität (DDC) --- Battery-Model --- Niederfrequenz --- Impedance