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Publikationen von Professorinnen und Professoren der HAW Hamburg

Jahr:  
Alle : 1983, ... , 2003, 2004, 2005, ... , 2021
Autor:  
Alle : A, À, B, C, D, E, F, G, H, I, J, K, L, M, N, O, Ö, P, Q, R, S, T, U, V, W, Y, Z 
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Referenzen

2021

Tagungs-/Konferenz-/Katalogbeiträge:

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Sean Cooper, Georg Rieger und Gerwald Lichtenberg
Exam Grades That Support Students’ Self-Regulated Learning
Vancouver
6th International STEM in Education Conference
akzeptiert

Marker: LS-MT

2020

Tagungs-/Konferenz-/Katalogbeiträge:

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Bettina Knappe, Gesine Cornelissen, Dagmar Rokita, Christoph Maas und Gerwald Lichtenberg
An Interdisciplinary Biotechnology Project - Experiences with a change to PBL
8th International Research Symposium on PBL
Aalborg
August
EDUCATE FOR THE FUTURE: PBL, SUSTAINABILITY AND DIGITALISATION
akzeptiert

Marker: LS-BT

Konferenz-/Workshop-/Podiumsdiskussionsbeiträge, Ausstellungs-/Modenschaubeteiligungen:

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Christian Modrzynski, Florian Rittweger, Valentin Roscher und Karl-Ragmar Riemschneider
Fiber Optical Cell State Monitoring of Anode and Cathode P1-46
Battery Conference 2020 / battery power eu
Münster
24 März 2020
engl.
akzeptiert

Schlüsselwörter: Lithium-ion batteries battery state observation fiber optical sensors

Marker: TI-IuE

Zusammenfassung: The increasing spread of lithium-ion batteries requires a better understanding of the cell state. Especially for systems that need a high reliability or possess a high-power output, cell-monitoring is mandatory. Current electrical methods like voltage metering or coulomb counting show a significant deviation from actual conditions. Therefore, alternative concepts for state-of-charge and state-of- health determination are necessary to get non-electrical information from the cell. Here, the optical observation of the electrode is an interesting field of research as the optical change of the electrode materials during cycling can reveal their current state. For graphite a color change is well-known and can be observed by the implementation of refractive-index-sensitive optical fibers. For the lithium iron phosphate cathode, marker materials indium tin oxide or antimony tin oxide were added to achieve a noticeable change of brightness of the electrode. This effect was also observed with a fiber optical system utilizing the evanescent field of an etched optical fiber with a micro-sized cladding. By this means, a cell with an optical fiber in each electrode was assembled and the cycling behavior of the optical transmission signal was monitored. The data shows a high correlation between optical signal and measured state-of-charge for both electrodes. This allows the state-of-charge determination with the help of an optical signal that is independent from electrical measurements. The additionally obtained cell information can be used to improve battery management systems and eventually achieve a saver and more efficient battery use.

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Florian Rittweger, Christian Modrzynski, Valentin Roscher und Karl-Ragmar Riemschneider
Optical in situ observation of lithium-ion battery electrodes for material characterization, P1-28
Battery Conference 2020 Münster / battery power eu
Münster
24 März 2020
engl.
akzeptiert

Schlüsselwörter: Lithium-ion batteries material characterization and research situ video microscopical setup ion dynamics diffusion coefficient

Marker: TI-IuE

Zusammenfassung: In situ methods are particularly beneficial for material characterization and research, due to their physical and chemical access. Our in situ video microscopical setup enables a direct optical observation of positive and negative battery electrodes during charge and discharge. Thereby, ion dynamics can be clearly seen as intercalation front, which is caused by a varying local state of charge (SoC) of the electrodes. The local SoC is seen as change in color or brightness. The latter is used to calculate apparent diffusion coefficients for an entire battery electrode via Fick's second law of diffusion. The diffusion coefficient is useful for the understanding of the overall electrical behavior of the battery and is aditionally required to design and simulate battery cells as well as to design future lithium ion chemistries.

2019

Zeitschriftenbeiträge:

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Antje Risius, Björn-Ole Klann und Stephan Meyerding
Choosing a lifestyle? Reflection of consumer extrinsic product preferences and views on important (extrinsic) wine characteristics in Germany
Wine Economics and Policy, 8(2):141-154
Dezember 2019
englisch

Marker: LS-Ok

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Stephan Meyerding, Elisabeth Spiwoks, Meike Rombach und Mira Lehberger
Not only speed matters - Crisis response in the hypothetical case of a transport accident involving genetically modified crops
Food Policy, 85:55-63
Mai 2019
englisch

Marker: LS-Ok

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Andrä Jörg, Florian Bleibaum, Anselm Sommer, Martin Veit, Björn Rabe, Karl Kunzelmann, Christian Nehls, Wilmar Correa, Thomas Gutsmann, Joachim Grötzinger, Sucharit Bhakdi und Karina Reiss
ADAM10 sheddase activation is controlled by cell membrane asymmetry
Journal of Molecular Cell Biology, 11(11):979-993
12 Februar 2019
englisch

Marker: LS-Bt

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Valentin Roscher, Florian Rittweger und Karl-Ragmar Riemschneider
Electrochromic effect of indium tin oxide in lithium iron phosphate battery cathodes for state of charge determination
ACS Applied Materials & Interfaces , American Chemical Society Journal, 2019(11 (7)):6900-6906
8 Januar 2019
ISSN: 19448244
engl.

Marker: TI-IE

Zusammenfassung: In this article, we discuss the origin of an optical effect in lithium iron phosphate (LFP) battery cathodes, which depends on the electrical charge transferred into the battery. Utilizing indium tin oxide (ITO) as an electrode additive, we were able to observe a change in reflectivity of the cathode during charging and discharging with lithiation and delithiation being clearly visible in the form of lithiation fronts. Further investigations using in situ video microscopy and in situ Raman spectroscopy on test cells with an optical window indicate that ITO additionally acts as an electrochromic marker within the LFP cathode. This enhances the optical effect due to local potentials around the lithiation fronts, which enables the voltage-dependent reflectivity of the ITO to be visible in the LFP cathode. Structural analysis with scanning electron microscopy and X-ray crystallography is presented as well. The observed effect allows for novel battery research methods and for a possible commercial application as a sensor for state-of-charge estimation.

Tagungs-/Konferenz-/Katalogbeiträge:

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Ayla Nawaz, Sven Pfeiffer, Gerwald Lichtenberg und Philipp Rostalski
Fault Detection Method for the SRF Cavities of the European XFEL
15th European Workshop on Advanced Control and Diagnosis

Marker: LS-MT

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Christian Modrzynski, Valentin Roscher, Florian Rittweger, AbdulRahman Ghannoum, Patricia Nieva und Karl-Ragmar Riemschneider
Integrated Optical Fibers for Simultaneous Monitoring of the Anode and the Cathode in Lithium Ion Batteries
2019 IEEE SENSORS
Montreal, QC, Canada, Palais des Congrès de Montréal
27-30 Oct. 2019
IEEE (Hrsg.) 2019 Conference Proceedings IEEE SENSORS , Seite pp. 1-4.
Verlag: ieeexplore.ieee.org/document/8956755,

Schlüsselwörter: monitoring of lithium-ion-batteries battery state fiber optics sensor pouch cell configuration graphite anode material lithium iron phosphate cathode material electrochromic marker additive electrochemical electrode observation

Marker: TI-IuE

Zusammenfassung: We present optical fiber measurements for cell state determination via simultaneous observation of both electrodes of a lithium-ion-battery. The integration of fiber optics is done using commercial electrodes set up in pouch configuration. This system extends the method, shown previously for the graphite anode. Lithium iron phosphate cathodes suffer from poor optical observability due to the addition of carbon black as conductive agent. Hence, carbon black is locally replaced by an electrochromic marker additive. Transmissions through integrated fibers were monitored during battery cycling and results show that the cell state of charge directly influences both transmission signals. Optical data can be utilized as a parameter independent of electrical measurements to estimate the state of charge.

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Letzte Änderung: 23.01.15

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