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14 results on '"Ziesche, Ralf"'

1. Electronvolt energy resolution with broadband ptychography

Author

Cipiccia, Silvia, Stolp, Wiebe, Fardin, Luca, Ziesche, Ralf, Manke, Ingo, Boone, Matthieu, Armstrong, Chris, Binder, Joachim R., Bohn, Nicole, Olivo, Alessandro, and Batey, Darren

Subjects
Physics - Applied Physics, Physics - Computational Physics
Abstract

Ptychography is a scanning coherent diffraction imaging technique successfully applied in the electron, visible and x-ray regimes. One of the distinct features of ptychography with respect to other coherent diffraction techniques is its capability of dealing with partial spatial and temporal coherence via the reconstruction algorithm. Here we focus on the temporal and clarify the constraints which affect the energy resolution limits of the ptychographic algorithms. Based on this, we design and perform simulations for a broadband ptychography in the hard x-ray regime, which enables an energy resolution down to 1 eV. We benchmark the simulations against experimental ptychographic data of an NMC battery cathode material, attaining an energy resolution of 5 eV. We review the results, discuss the limitations, and provide guidelines for future broadband ptychography experiments, its prospective application for single acquisition x-ray absorption near edge structure imaging, magnetic dichroism imaging, and potential impact on achieving diffraction limited resolutions.

Published
2024

4. Advanced imaging of electrochemical devices : imaging of lithium batteries and fuel cells

Author

Ziesche, Ralf Franz

Subjects
621.31
Abstract

Batteries and fuel cells have already shown high potential across a diverse range of applications such as automotive power trains, space propulsion and medical implants. However, further developments are still required with regards to reliability, efficiency and safety. For that, multimodal and complementary characterisation methods that combine common investigation tools may allow one technique, e.g. X-ray, to overcome the drawbacks of another, e.g. neutron, and vice versa. For instance, recent developments in innovative neutron imaging techniques, which is highly sensitive to lithium and hydrogen, are able to compliment X-ray methods that cannot easily detect such light elements, closing the gaps in information. This thesis utilises the latest neutron and X-ray techniques to examine commercial and lab-made lithium metal, Li-ion battery and fuel cells. Four-dimensional (4D) high-resolved neutron and X-ray computed tomography (CT) allow the quantitative determination of the lithium transport inside commercial Li/SOCl2 cells, and the detection of the electrolyte consumption and degradation processes which affect the cell capacity. High throughput X-ray CT has enabled the identification of mechanical degradation processes in commercial Li/MnO2 Li-ion primary batteries. Complementary neutron CT has identified the lithium diffusion process and electrode wetting by electrolyte. Virtual electrode unrolling techniques provide a deeper view inside the electrode layers and detect minor fluctuations which are difficult to observe using conventional three-dimensional (3D) rendering tools. High-speed operando CT has shown temporal resolved water evolution in the electrode flow-fields and the membrane electrode assembly of polymer electrolyte fuel cells in 3D for the first time. This allow a quantitative comparison between different operation modes and cell designs by the water management. 4D neutron Bragg edge imaging has shown their potential to characterise the different lithiation phases spatially resolved in novel directional ice templated graphite electrodes. Finally, 3D Bragg Ptychography is utilised to visualise the nano-metre layered crystal structure of small graphite flakes used as active electrode material in Li-ion batteries.

Published
2020

10. Editors’ Choice—4D Neutron and X-ray Tomography Studies of High Energy Density Primary Batteries: Part I. Dynamic Studies of LiSOCl2 during Discharge

Author

Ziesche, Ralf F., Robinson, James B., Kok, Matthew D. R., Markötter, Henning, Kockelmann, Winfried, Kardjilov, Nikolay, Manke, Ingo, Brett, Dan J. L., and Shearing, Paul R.

Subjects
ddc:540
Abstract

The understanding of dynamic processes in Li-metal batteries is an important consideration to enable the full capacity of cells to be utilised. These processes, however, are generally not directly observable using X-ray techniques due to the low attenuation of Li; and are challenging to visualise using neutron imaging due to the low temporal resolution of the technique. In this work, complementary X-ray and neutron imaging are combined to track the dynamics of Li within a primary Li/SOCl2 cell. The temporal challenges posed by neutron imaging are overcome using the golden ratio imaging method which enables the identification of Li diffusion in operando. This combination of techniques has enabled an improved understanding of the processes which limit rate performance in Li/SOCl2 cells and may be applied beyond this chemistry to other Li-metal cells.

Published
2020

11. 4D imaging of lithium-batteries using correlative neutron and X-ray tomography with a virtual unrolling technique

Author

Ziesche, Ralf, Arlt, Tobias, Finegan, Donal, Heenan, Thomas, Tengattini, Alessandro, Baum, Daniel, Kardjilov, Nikolay, Markötter, Henning, Manke, Ingo, Kockelmann, Winfried, Brett, Dan J.L., Shearing, Paul R., Ziesche, Ralf, Arlt, Tobias, Finegan, Donal, Heenan, Thomas, Tengattini, Alessandro, Baum, Daniel, Kardjilov, Nikolay, Markötter, Henning, Manke, Ingo, Kockelmann, Winfried, Brett, Dan J.L., and Shearing, Paul R.

Abstract

The temporally and spatially resolved tracking of lithium intercalation and electrode degradation processes are crucial for detecting and understanding performance losses during the operation of lithium-batteries. Here, high-throughput X-ray computed tomography has enabled the identification of mechanical degradation processes in a commercial Li/MnO2 primary battery and the indirect tracking of lithium diffusion; furthermore, complementary neutron computed tomography has identified the direct lithium diffusion process and the electrode wetting by the electrolyte. Virtual electrode unrolling techniques provide a deeper view inside the electrode layers and are used to detect minor fluctuations which are difficult to observe using conventional three dimensional rendering tools. Moreover, the ‘unrolling’ provides a platform for correlating multi-modal image data which is expected to find wider application in battery science and engineering to study diverse effects e.g. electrode degradation or lithium diffusion blocking during battery cycling.

Published
2020

13. Time-of-Flight Neutron Imaging on IMAT@ISIS: A New User Facility for Materials Science

Author

Kockelmann, W, Minniti, T, Pooley, D, Burca, G, Ramadhan, R, Akeroyd, F, Howells, G, Moreton-Smith, C, Keymer, D, Kelleher, J, Kabra, S, Lee, T, Ziesche, R, Reid, A, Vitucci, G, Gorini, G, Micieli, D, Agostino, R, Formoso, V, Aliotta, F, Ponterio, R, Trusso, S, Salvato, G, Vasi, C, Grazzi, F, Watanabe, K, Lee, J, Tremsin, A, Mcphate, J, Nixon, D, Draper, N, Halcrow, W, Nightingale, J, Kockelmann, Winfried, Minniti, Triestino, Pooley, Daniel, Burca, Genoveva, Ramadhan, Ranggi, Akeroyd, Freddie, Howells, Gareth, Moreton-Smith, Chris, Keymer, David, Kelleher, Joe, Kabra, Saurabh, Lee, Tung, Ziesche, Ralf, Reid, Anthony, Vitucci, Giuseppe, Gorini, Giuseppe, Micieli, Davide, Agostino, Raffaele, Formoso, Vincenzo, Aliotta, Francesco, Ponterio, Rosa, Trusso, Sebastiano, Salvato, Gabriele, Vasi, Cirino, Grazzi, Francesco, Watanabe, Kenichi, Lee, Jason, Tremsin, Anton, McPhate, Jason, Nixon, Daniel, Draper, Nick, Halcrow, William, Nightingale, Jim, Kockelmann, W, Minniti, T, Pooley, D, Burca, G, Ramadhan, R, Akeroyd, F, Howells, G, Moreton-Smith, C, Keymer, D, Kelleher, J, Kabra, S, Lee, T, Ziesche, R, Reid, A, Vitucci, G, Gorini, G, Micieli, D, Agostino, R, Formoso, V, Aliotta, F, Ponterio, R, Trusso, S, Salvato, G, Vasi, C, Grazzi, F, Watanabe, K, Lee, J, Tremsin, A, Mcphate, J, Nixon, D, Draper, N, Halcrow, W, Nightingale, J, Kockelmann, Winfried, Minniti, Triestino, Pooley, Daniel, Burca, Genoveva, Ramadhan, Ranggi, Akeroyd, Freddie, Howells, Gareth, Moreton-Smith, Chris, Keymer, David, Kelleher, Joe, Kabra, Saurabh, Lee, Tung, Ziesche, Ralf, Reid, Anthony, Vitucci, Giuseppe, Gorini, Giuseppe, Micieli, Davide, Agostino, Raffaele, Formoso, Vincenzo, Aliotta, Francesco, Ponterio, Rosa, Trusso, Sebastiano, Salvato, Gabriele, Vasi, Cirino, Grazzi, Francesco, Watanabe, Kenichi, Lee, Jason, Tremsin, Anton, McPhate, Jason, Nixon, Daniel, Draper, Nick, Halcrow, William, and Nightingale, Jim

Abstract

The cold neutron imaging and diffraction instrument IMAT at the second target station of the pulsed neutron source ISIS is currently being commissioned and prepared for user operation. IMAT will enable white-beam neutron radiography and tomography. One of the benefits of operating on a pulsed source is to determine the neutron energy via a time of flight measurement, thus enabling energy-selective and energy-dispersive neutron imaging, for maximizing image contrasts between given materials and for mapping structure and microstructure properties. We survey the hardware and software components for data collection and image analysis on IMAT, and provide a step-by-step procedure for operating the instrument for energy-dispersive imaging using a two-phase metal test object as an example

Published
2018

14. Time-of-Flight Neutron Imaging on IMAT@ISIS: A New User Facility for Materials Science

Author

Kockelmann, Winfried, primary, Minniti, Triestino, additional, Pooley, Daniel, additional, Burca, Genoveva, additional, Ramadhan, Ranggi, additional, Akeroyd, Freddie, additional, Howells, Gareth, additional, Moreton-Smith, Chris, additional, Keymer, David, additional, Kelleher, Joe, additional, Kabra, Saurabh, additional, Lee, Tung, additional, Ziesche, Ralf, additional, Reid, Anthony, additional, Vitucci, Giuseppe, additional, Gorini, Giuseppe, additional, Micieli, Davide, additional, Agostino, Raffaele, additional, Formoso, Vincenzo, additional, Aliotta, Francesco, additional, Ponterio, Rosa, additional, Trusso, Sebastiano, additional, Salvato, Gabriele, additional, Vasi, Cirino, additional, Grazzi, Francesco, additional, Watanabe, Kenichi, additional, Lee, Jason, additional, Tremsin, Anton, additional, McPhate, Jason, additional, Nixon, Daniel, additional, Draper, Nick, additional, Halcrow, William, additional, and Nightingale, Jim, additional

Published
2018
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