A5023943959- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advancements in Battery Materials
- Non-Destructive Testing Techniques
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Electron and X-Ray Spectroscopy Techniques
- Force Microscopy Techniques and Applications
- Thermography and Photoacoustic Techniques
- Crystallography and molecular interactions
- Advanced Battery Materials and Technologies
- Power Transformer Diagnostics and Insulation
- High voltage insulation and dielectric phenomena
- Optical Coherence Tomography Applications
- Mineral Processing and Grinding
- Surface Chemistry and Catalysis
- Supercapacitor Materials and Fabrication
- Advanced Fluorescence Microscopy Techniques
- Fuel Cells and Related Materials
- Spectroscopy Techniques in Biomedical and Chemical Research
- Electrical and Bioimpedance Tomography
- Advanced battery technologies research
- Molecular Junctions and Nanostructures
- Advanced X-ray Imaging Techniques
- Magnetic Properties and Synthesis of Ferrites
The Faraday Institution
2020-2025
University College London
2020-2025
ECSI Fibrotools (United States)
2022
Biochemical Society
2020-2022
London Centre for Nanotechnology
2020
University of St Andrews
2018
Abstract The next generation of automotive lithium‐ion batteries may employ NMC811 materials; however, defective particles are significant interest due to their links performance loss. Here, it is demonstrated that even before operation, on average, one‐third experience some form defect, increasing in severity near the separator interface. It determined can be detected and quantified using low resolution imaging, presenting a improvement for material statistics. Fluorescence diffraction data...
Graphite is the most commonly used anode material in commercial lithium-ion batteries (LiBs). Understanding mechanisms driving dimensional changes of graphite can pave way to methods for inhibiting degradation pathways and possibly predict electrochemical performance loss. In this study, correlative microscopy tools were alongside dilatometry (ECD) provide new insights into during galvanostatic cycling. X-ray computed tomography (CT) provided a morphological perspective cycled electrode so...
Increasing the operating voltage of lithium-ion batteries unlocks access to a higher charge capacity and therefore increases driving range in electric vehicles, but doing so results accelerated degradation via various mechanisms. A mechanism particular interest is particle cracking positive electrode, resulting losses capacity, disconnection active material, electrolyte side reactions, gas formation. In this study, NMC811 (LiNi 0.8 Mn 0.1 Co O 2 ) half-cells are charged increasing cut-off...
Abstract Vast quantities of powder leave production lines each day, often with strict control measures. For quality checks to provide the most value, they must be capable screening individual particles in 3D and at high throughput. Conceptually, X‐ray computed tomography (CT) is this; however, achieving lab‐based reconstructions has, until now, relied upon scan‐times on order tens hours, or even days, although synchrotron facilities are potentially faster scanning times, availability...
To understand fracture behaviour in battery materials, X-ray computed tomography (X-ray CT) has become the primary technique for non-destructive particle analysis. Cracking causes performance decline polycrystalline NMC811 by exposing new surfaces parasitic electrolyte reactions and disconnecting active material from electrode matrix. First cycle crack formation been documented, but definitive electrochemically induced is challenging to assess due complex sample preparation high-resolution...
To understand fracture behaviour in battery materials, X-ray computed tomography (X-ray CT) has become the primary technique for non-destructive particle analysis. Cracking causes performance decline polycrystalline NMC811 by exposing...
Due to complex degradation mechanisms, disparities between the theoretical and practical capacities of lithium-ion battery cathode materials persist. Specifically, Ni-rich chemistries such as LiNi0.8Mn0.1Co0.1O2 (or NMC811) are one most promising choices for automotive applications; however, they continue suffer severe during operation that is poorly understood, thus challenging mitigate. Here we use operando Bragg coherent diffraction imaging 4D analysis these mechanisms by inspecting...
Understanding the performance of commercially relevant cathode materials for lithium-ion (Li-ion) batteries is vital to realize potential high-capacity automotive applications. Of particular interest spatial variation crystallographic behavior across (what can be) highly inhomogeneous electrodes. In this work, a high-resolution X-ray diffraction technique was used obtain operando transmission measurements Li-ion pouch cells measure variances in cell during electrochemical cycling. Through...
To understand the fracture behaviour in battery materials, X-ray computed tomography (X-ray CT) has been employed widely and become primary technique for non-destructive particle analysis. Cracking is known to cause decline cell performance of polycrystalline NMC811 as it exposes new surfaces parasitic electrolyte reactions disconnects active material from electrode matrix. First cycle crack formation documented previously; however, definitive electrochemically induced can be difficult...
A series of representative late d-block metal complexes bearing a rigid bis(phosphine) ligand, iPr2P-Ace-PPh2 (L, Ace = acenaphthene-5,6-diyl), was prepared and fully characterized by various techniques, including multinuclear NMR single-crystal X-ray diffraction. The heteroleptic nature the peri-substituted ligand L allows for direct observation JPP couplings in 31P{1H} spectra. Magnitudes are correlated with identity geometry distortions L. forced overlap phosphine lone pairs due to...
Abstract X‐ray computed tomography (X‐ray CT) is a non‐destructive characterization technique that in recent years has been adopted to study the microstructure of battery electrodes. However, often manual and laborious data analysis process hinders extraction useful metrics can ultimately inform mechanisms behind cycle life degradation. This work presents novel approach combines two convolutional neural networks first locate segment each particle nano‐CT LiNiMnCoO 2 (NMC) electrode dataset,...
To understand the fracture behaviour in battery materials, X-ray computed tomography (X-ray CT) has been employed widely and become primary technique for non-destructive particle analysis. Cracking is known to cause decline cell performance of polycrystalline NMC811 as it exposes new surfaces parasitic electrolyte reactions disconnects active material from electrode matrix. First cycle crack formation documented previously; however, definitive electrochemically induced can be difficult...
To understand the fracture behaviour in battery materials, X-ray computed tomography (X-ray CT) has been employed widely and become primary technique for non-destructive particle analysis. Cracking is known to cause decline cell performance of polycrystalline NMC811 as it exposes new surfaces parasitic electrolyte reactions disconnects active material from electrode matrix. First cycle crack formation documented previously; however, definitive electrochemically induced can be difficult...
Abstract Electric vehicles (EV) demand high charge/discharge rates creating potentially dangerous temperature rises. Lithium-ion cells are sealed during their manufacture, making internal temperatures challenging to probe1. Tracking current collector expansion using X-ray diffraction (XRD) permits non-destructive measurements2; however, cylindrical known experience complex strain3,4. Here, we characterise the state-of-charge (SoC), mechanical strain, and within 18650 operated at (>3C) via...
Commercial candidates for electric vehicle batteries include Ni-rich Li(Ni 0.8 Mn 0.1 Co )O 2 (NMC811) cathodes due to their high specific capacity (200 mAh/g) and reduced cobalt content, which has positive socio-economic repercussions. Despite all of the advantages, these materials suffer from a range degradation modes, many are associated with redox crystallographic behavior at states charge thought be cause rapid fade. NMC811 suffers anisotropic changes in crystal structure during...
During charge/discharge cracking occurs in Nickel Manganese Cobalt (NMC) secondary particles. Secondary particles with cracks will have observably lower grey-levels micro-CT datasets compared to an otherwise identical pristine particle. This is due the ‘partial volume effect’ where voxels representative of space containing both void and solid phases result that are intermediate between or only. In this work, we present a method for automatically tracking changes grey-level effect large...
Using X-ray tomography, we can predict and study the factors that govern fracture behaviour cracking in NMC811 particles as a function of potential. Cracking fracturing is known to cause decline battery performance, regions become disintegrated from conductive matrix. However, electrochemically induced be difficult assess due complicated sample preparation methods required. An in-situ accurately determines onset during delithiation layered structure crucial characterize voltage-induced...