A5046611833- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Materials and Technologies
- Non-Destructive Testing Techniques
- Advanced Memory and Neural Computing
- Phase-change materials and chalcogenides
- Fuel Cells and Related Materials
- Extraction and Separation Processes
- Transition Metal Oxide Nanomaterials
- Advancements in Solid Oxide Fuel Cells
- Thermography and Photoacoustic Techniques
- Electronic and Structural Properties of Oxides
- Force Microscopy Techniques and Applications
- Ferroelectric and Negative Capacitance Devices
- Electrical and Bioimpedance Tomography
- Advanced X-ray and CT Imaging
- Chalcogenide Semiconductor Thin Films
- Advanced Electron Microscopy Techniques and Applications
- Advanced battery technologies research
- Recycling and Waste Management Techniques
- Hybrid Renewable Energy Systems
- Liquid Crystal Research Advancements
- Power Transformer Diagnostics and Insulation
- Nuclear Physics and Applications
University College London
2016-2025
The Faraday Institution
2019-2025
Biochemical Society
2017-2025
ECSI Fibrotools (United States)
2022-2023
Singapore University of Technology and Design
2019-2022
London Centre for Nanotechnology
2018-2021
Research Complex at Harwell
2021
Transnational Press London
2018-2020
Data Storage Institute
2008-2015
Agency for Science, Technology and Research
2012-2015
Abstract Driving range and fast charge capability of electric vehicles are heavily dependent on the 3D microstructure lithium-ion batteries (LiBs) substantial fundamental research is required to optimise electrode design for specific operating conditions. Here we have developed a full microstructure-resolved model using novel X-ray nano-computed tomography (CT) dual-scan superimposition technique that captures features carbon-binder domain. This elucidates how LiB performance markedly...
Favorable conditions for lithium plating on graphite electrodes occur at high charge rates, causing accelerated degradation and safety concerns. A detailed map of lithiation dyamics is presented.
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...
This study presents a technique to directly characterize the carbon and binder domain (CBD) in lithium-ion (Li-ion) battery electrodes three dimensions use it determine effective transport properties of LiNi0.33Mn0.33Co0.33O2 (NMC) electrode. X-ray nanocomputed tomography (nano-CT) is used image an electrode composed solely binder, whereas focused ion beam–scanning electron microscopy analyze cross-sections NMC gain morphological information regarding CBD porosity. Combining gathered from...
Optimizing the chemical and morphological parameters of lithium-ion (Li-ion) electrodes is extremely challenging, due in part to absence techniques construct spatial temporal descriptions heterogeneities. We present first demonstration combined high-speed X-ray diffraction (XRD) XRD computed tomography (XRD-CT) probe, 3D, crystallographic heterogeneities within Li-ion with a resolution 1 μm. The local charge-transfer mechanism between individual particles was investigated...
Abstract The performance of lithium ion electrodes is hindered by unfavorable chemical heterogeneities that pre-exist or develop during operation. Time-resolved spatial descriptions are needed to understand the link between such and a cell’s performance. Here, operando high-resolution X-ray diffraction-computed tomography used spatially temporally quantify crystallographic within particles throughout both fresh degraded Li x Mn 2 O 4 electrodes. This imaging technique facilitates...
Abstract Ceramic fuel cells offer a clean and efficient means of producing electricity through variety fuels. However, miniaturization cell dimensions for portable device application remains challenge, as volumetric power densities generated by readily-available planar/tubular ceramic are limited. Here, we demonstrate concept ‘micro-monolithic’ design. The mechanical robustness structural integrity this design is thoroughly investigated with real-time, synchrotron X-ray diffraction computed...
Microstructural design strategies across multiple length scales for improved rate performance of automotive battery electrodes, assisted by physics-based microstructure-resolved model.
Establishing the nature of crack generation, formation, and propagation is paramount to understanding degradation modes that govern decline in battery performance.
Abstract Lithium sulfur (Li-S) batteries offer higher theoretical specific capacity, lower cost and enhanced safety compared to current Li-ion battery technology. However, the multiple reactions phase changes in conversion cathode result highly complex phenomena that significantly impact cycling life. For first time authors’ knowledge, a multi-scale 3D in-situ tomography approach is used characterize morphological parameters track microstructural evolution of across charge cycles. Here we...
Cylindrical lithium-ion batteries are used across a wide range of applications from spacesuits to automotive vehicles. Specifically, many manufacturers producing cells in the 18650 geometry i.e., steel cylinder diameter and length ca. 18 65 mm, respectively. One example is LG Chem INR18650 MJ1 (nominal values: 3.5 Ah, 3.6 V, 12.6 Wh). This article describes electrochemical performance microstructural assembly such cells, where all under-pinning data made openly available for benefit wider...
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...
Lithium sulfur (Li–S) batteries have great potential as a successor to Li-ion batteries, but their commercialization has been complicated by multitude of issues stemming from complex multiphase chemistry. In situ X-ray tomography investigations enable direct observations be made about battery, providing unprecedented insight into the microstructural evolution cathode and shedding light on reaction kinetics phase. Here, for first time, morphology was visualized in 3D function state charge at...
This study presents the application of X-ray diffraction computed tomography for first time to analyze crystal dimensions LiNi0.33Mn0.33Co0.33O2 electrodes cycled 4.2 and 4.7 V in full cells with graphite as negative at 1 μm spatial resolution determine change unit cell a result electrochemical cycling. The nature technique permits localization information 3D mapping heterogeneities from electrode particle level. An overall decrease 0.4% 0.6% was observed volume after 100 cycles V....
Abstract In recent years, low-temperature polymer electrolyte fuel cells have become an increasingly important pillar in a zero-carbon strategy for curbing climate change, with their potential to power multiscale stationary and mobile applications. The performance improvement is particular focus of research engineering roadmaps, water management being one the major areas interest development. Appropriate characterisation tools mapping evolution, motion removal are high importance tackle...
Lithium-based rechargeable batteries such as lithium-ion (Li-ion), lithium-sulfur (Li-S), and lithium-air (Li-air) cells typically consist of heterogenous porous electrodes. In recent years, there has been growing interest in the use in-situ operando micro-CT to capture their physical chemical states 3D. The development electrochemical along with improvements radiation sources have expanded capabilities a technique for longitudinal studies on operating mechanisms degradation. this paper, we...
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...
We present a novel selector made of doped-chalcogenide material. This not only achieves low holding voltage (0.2 V) and large on/off ratio (>10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</sup> ), but also exhibits the high on-current density (>1.6 MA/cm xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) hysteresis window (1.2 V). Besides, excellent performances with ultra-low off-state leakage current (10 pA), switching speed (<10 ns),...
X-ray nano-tomography was used to study the strain evolution of an NMC electrode under uniaxial compression mimic calendering.