A5038574979- Advanced Battery Technologies Research
- Molecular Spectroscopy and Structure
- Advancements in Battery Materials
- Inorganic Fluorides and Related Compounds
- Atmospheric Ozone and Climate
- Chemical Thermodynamics and Molecular Structure
- Spectroscopy and Laser Applications
- Energy Harvesting in Wireless Networks
- MXene and MAX Phase Materials
- Recycling and Waste Management Techniques
- Plant responses to water stress
- Crop Yield and Soil Fertility
- Supercapacitor Materials and Fabrication
- Machine Learning in Materials Science
- Intermetallics and Advanced Alloy Properties
- Energy Efficient Wireless Sensor Networks
- Adhesion, Friction, and Surface Interactions
- Anatomy and Medical Technology
- Various Chemistry Research Topics
- Solid-state spectroscopy and crystallography
- Advanced materials and composites
- Surgical Simulation and Training
- Crystal Structures and Properties
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
Helmholtz Centre for Environmental Research
2020-2021
UCLouvain
2020
Forschungszentrum Jülich
2020
Lancaster University
2017-2018
Lancaster City Council
2018
University Hospital Münster
2017
CREATe Centre
2015
Technical University of Munich
2015
University of Waterloo
1992-1994
The propagation of strain within a commercial LiCoO2 (LCO) electrode for lithium-ion batteries is investigated during cycling. An experimental multiscale approach combined with microstructural, mechanical simulations. crystal structure exhibits volume change 2.32% measured by in operando X-ray diffraction (XRD) measurements. resulting the thickness about 1.8% and electrochemical dilatometry. width electrode, fraction active material, binder geometry all affect deformation; this using...
Measurements of the open circuit voltage Li-ion cells have been extensively used as a non-destructive characterisation tool. Another technique based on entropy change measurements has also applied for this purpose. More recently, both techniques to make qualitative statements about aging in cells. One proposed cause cell failure is point defect formation electrode materials. The steps profiles, and peaks profiles are sensitive order/disorder transitions arising from Li/vacancy...
With the perennial demand for longer runtime of battery-powered Wireless Sensor Nodes (WSNs), several techniques have been proposed to increase battery runtime. One such class exploiting recovery effect phenomenon claims that performing an intermittent discharge instead a continuous will usable capacity. Several works in areas embedded systems and wireless sensor networks assumed existence this different power management form supply architectures (multiple setup) communication protocols...
Abstract Raman and infrared spectra of solid H 2 Se at temperatures between 85 20 K are reported interpreted. The broad peaks observed in the phase II characteristic an orientationally disordered crystal, whereas multiple components internal modes rich lattice found for III indicative ordered structure. unit cell this is probably centrosymmetric contains least four molecules. Plausible assignments all spectroscopic features proposed.
Abstract Raman and infrared spectra of soiid dibromodifluoromethane are reported for both the lattice internal mode regions at temperatures between 12 K melting point. No evidence was found a solid‐state phase transition. Plausible assignments all observed spectroscopic features suggested. The compatible with non‐centrosymmetric unit cell containing four molecules.
Abstract Raman and infrared spectra of solid bromotrifluoromethane were recorded in both the internal lattice mode regions at temperatures between 12 K melting point. No evidence a solid‐state phase transition was found. Lattice peaks assigned on basis geometrical intensity arguments, splittings modes interpreted terms isotopic or crystal field effects. A non‐centrosymmetric unit cell containing four molecules shown to be compatible with observed spectra.
We report on entropy profile measurements at lithium ion full and half cells. 1 Those profiles are derived from voltage responses temperature variations for various states of charge. For LiCoO 2 cathodes, measured in cells, we demonstrate that the sensitive to particle sizes as varied through synthesis method, including calcination (Fig. 1). The origin those is further elucidated by in-situ XRD studies thermodynamic calculations. discuss, how far reflect an impact stability ordered...
Abstract Vibrational spectra of solid tribromofluoromethane at temperatures between 12 K and the melting point were obtained using Raman infrared techniques, with special emphasis on lattice modes. No evidence for a solid‐state phase transition was found. Lattice peaks are tentatively assigned basis geometrical intensity arguments. It is shown that compatible non‐centrosymmetric unit cell containing four molecules.
Abstract Raman and infrared spectra of solid CH 2 CIF (Freon 31) were recorded in both the lattice internal mode regions for samples at temperatures between 12 125 K. No evidence any solid‐state phase transition was found, but some thin‐film deposited low appear to exist a metastable phase. Spectra stable are compatible with non‐centrosymmetric unit cell containing four molecules. Lattice peaks assigned on basis geometrical intensity arguments.
The development of high capacity batteries that are also stable in the long run is critical for highly demanding applications such as electric vehicles, plug-in hybrids and energy storage. Several in-situ characterisation techniques, including electrochemical thermodynamic techniques entropy profiling [1-4], have been developed to examine effects battery aging. In this method, open circuit potential, E OCP , varied with respect temperature, T according (∂ / ∂ ) p x = -(1 nF )(∂ S ( which...
Abstract Raman spectra of solid trifluoroiodomethane are reported for both the lattice and internal mode regions samples at temperatures between 12 130 K. A solid‐state phase transition about 115 K is confirmed. Above this temperature, characteristic a disordered or highly anharmonic solid. At low temperatures, compatible with an ordered, harmonic molecular crystal unit cell containing least four molecules. Plausible assignments all observed spectroscopic features proposed.
Abstract The vibrations of linear ABC2 type molecules with C∞V point group are analysed in terms Cartesian co-ordinates. Algebraic expressions for the three stretching and two bending normal mode frequencies derived longitudinal transverse force constants, atomic masses bond lengths. Values non-valence interaction parameters transferred from A2B2 (D∞h) molecules, values principal constants adjusted to reproduce observed a number asymmetric halogen derivatives acetylene. Normal various...