Zeliang Su

• Master of Science
• University of Picardie Jules Verne

In the context of calling for low carbon emissions, lithium‐ion batteries (LIBs) have been widely concerned as a power source for electric vehicles, so the fundamental science behind their manufacturing has attracted much attention in recent years. Calendering is an important step of the LIB electrode manufacturing process, and associated changes i...

Li‐O2 batteries (LOB) performance degradation ultimately occurs through the accumulation of discharge products and irreversible clogging of the porous electrode during the cycling. Electrode binder degradation in the presence of reduced oxygen species can result in additional coating of the conductive surface, exacerbating capacity fading. Herein,...

In this study, we present a well-defined methodology for conducting Operando X-ray absorption near-edge structure spectroscopy (XANES) in conjunction with transmission X-ray nano computed tomography (TXM-nanoCT) experiments on the LiNi 0.5 Mn 0.3 Co 0.2 O 2 (NMC) cathode electrode. To minimize radiation-induced damage to the sample during charge an...

In this study, we present a well-defined methodology for conducting Operando X-ray absorption near-edge structure spectroscopy (XANES) in conjunction with transmission X-ray nano computed tomography (TXM-nanoCT) experiments on the LiNi$_{0.5}$Mn$_{0.3}$Co$_{0.2}$O$_2$ (NMC) cathode electrode. To minimize radiation-induced damage to the sample durin...

In the context of calling for low carbon emissions, lithium-ion batteries (LIBs) have been widely concerned as a power source for electric vehicles, so the fundamental science behind their manufacturing has attracted much attention in recent years. Calendering is an important step of the LIB electrode manufacturing process, and the changes it bring...

Li-O$_2$ batteries (LOB) performance degradation ultimately occurs through the accumulation of discharge products and irreversible clogging of the porous electrode during the cycling. Electrode binder degradation in the presence of reduced oxygen species can result in additional coating of the conductive surface, exacerbating capacity fading. Herei...

The segmentation of tomographic images of the battery electrode is a crucial processing step, which will have an additional impact on the results of material characterization and electrochemical simulation. However, manually labeling X-ray CT images (XCT) is time-consuming, and these XCT images are generally difficult to segment with histographical...

Image perception plays a fundamental role in the tomography-based approaches for microstructure characterization and has a deep impact on all subsequent stages of image processing, such as segmentation and 3D analysis. The enhancement of image perception, however, frequently involves observer-dependence, which reflects user-to-user dispersion and u...

Microstructural evolution of NMC secondary particles during the battery operation drives the electrochemical performance and impacts the Li-ion battery lifetime. In this work, we develop an in situ methodology using the FIB/SEM instrument to cycle single secondary particles of NMC active materials while following the modifications of their 3D morph...

Performing high resolution 3D imaging with transmission X‐ray microscopy (TXM) in an in situ battery system is extremely challenging. We show herein a method to conduct an in situ nano‐X ray Computed Tomography (nano‐XCT) experiment assisted by the in‐line phase contrast technique for low Z elements in batteries. A carbon‐based O2‐cathode of Li‐O2...

Li-O2 batteries offer a high theoretical discharge capacity due to the formation of light discharged species such as Li2O2, which fill the porous positive electrode. However, in practice, it is challenging to reach the theoretical capacity and completely utilize the full electrode pore volume during discharge. With the formation of discharge produc...

Despite significant progress in the field of tomography, capturing the carbon binder domain (CBD) morphology presented in the Li‐ion electrode remains challenging, due to its low attenuation coefficient. In this work, quantitative phase contrast X‐ray nano‐holotomography is used as a straightforward approach that provides a large reconstructed volu...

It’s well known that the Li-O 2 battery can achieve theoretically ¹ ten times as much energy density (5200Wh/kg) as Li-ion battery but often limited in reality on the capacity and the cycling. In this system, the carbon cathode provides merely a framework for the lithium peroxide deposition but is not an active material. The dissolved oxygen in the...

We investigated the lithium peroxide (Li2O2) and pore size distribution in lithium-O2 battery electrodes at different states of charge using transmission X-ray microscopy coupled with Zernike phase contrast to carry out nano-Computed Tomography. We report that such technique enables, at the nanoscale, to distinguish light elements such as carbon an...

In the literature, reported 3D-resolved models rely on oversimplifications, such as an implicit representation of the carbon-binder domains (CBD) through the use of effective parameters for porosity and tortuosity or by merging CBD with the Active Material (AM) as a single solid phase. This work’s novelty relies on the explicit representation of CB...

In this work we present a multi-paradigm modeling approach simulating the link between the fabrication process of lithium-ion battery electrodes and their electrochemical performance at the cell level. The approach combines discrete particle (Coarse Grained Molecular Dynamics) and continuum (PDE-based) mathematical models. Discrete particle models...