A5059850751- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Advanced MRI Techniques and Applications
- Cardiac Ischemia and Reperfusion
- Electron Spin Resonance Studies
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Cardiac electrophysiology and arrhythmias
- Cardiac Imaging and Diagnostics
- Electrostatics and Colloid Interactions
- Thermal Expansion and Ionic Conductivity
- Recycling and Waste Management Techniques
- Cardiovascular Function and Risk Factors
- Surfactants and Colloidal Systems
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and interfaces
- Advanced battery technologies research
- Semiconductor materials and devices
- Magnesium Alloys: Properties and Applications
- Advanced NMR Techniques and Applications
- Conducting polymers and applications
- Drug-Induced Hepatotoxicity and Protection
- Electrochemical Analysis and Applications
- ECG Monitoring and Analysis
CEA LITEN
2015-2024
Université Grenoble Alpes
2017-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA Grenoble
1984-2017
Institut des Matériaux Jean Rouxel
2007-2012
Nantes Université
2009-2012
National Institute of Standards and Technology
2012
Tokyo Institute of Technology
2007-2012
Material Measurement Laboratory
2012
Centre National de la Recherche Scientifique
1998-2012
In order to improve the electrochemical performances of lithium–sulfur batteries, it is crucial understand profoundly their working mechanism and limitation factors. This communication presents synchrotron-based in situ XRD studies structural modifications occurring inside cell upon cycling, since active material changes constantly its form between solid liquid phases.
Emerging energy storage systems based on abundant and cost-effective materials are key to overcome the global climate crisis of 21st century.
A quantitative analysis of in situ and operando X-ray diffraction studies allows for deeper insight into the mechanism Li2S formation consumption. two-step reaction process is proposed both discharge charge. Changing selectivity estimated, with solely being formed during earliest step, followed by possible concurrent Li2S2 intermediate further step discharge.
A recent transmission electron microscopy (TEM) method using precession diffraction (PED) was used to obtain LiFePO4 and FePO4 phase mapping at the nanometer-scale level on a large number of particles sizes between 50 300 nm in partially charged cathode. Despite similarity two phases (the difference lattice parameters is <5%), gives clear results that have been confirmed high-resolution (HRTEM) energy-filtered microscopy/electron energy loss spectroscopy (EFTEM/EELS) experiments. The PED...
The impact of ambient air exposure on nanocomposites has been investigated. A pristine sample was prepared without any to through the whole process synthesis and characterization compared exposed samples. small amount lithium deintercalates from olivine structure during exposure, a majority which can be electrochemically reintercalated. This phenomenon changes initial surface bulk properties should taken into account when diminishing particle size . Keeping away oxidative moisture atmosphere...
High-voltage spinel oxides combined with Li4Ti5O12 result in 3 V Li-ion batteries a high power capability, but electrochemical performances are limited by electrode/electrolyte interfacial reactivity at potential. We have investigated glutaric anhydride (GA) as an electrolyte additive to improve the of LiNi0.4Mn1.6O4/Li4Ti5O12 cells. showed that GA efficiently reduces both capacity fading upon cycling and self-discharge. From X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance...
Metallic lithium deposition is a typical aging mechanism observed in lithium-ion cells at low temperature and/or high charge rate. Lithium dendrite growth not only leads to strong capacity fading, it also causes safety concerns such as short-circuits the cell. In applications electric vehicles, use of batteries combines discharging, long rest time and charging phases. It foremost matter lifetime from perspective consumer or investor.
A Li-rich layered oxide with the formula Li[Li0.2Mn0.61Ni0.18Mg0.01]O2 was successfully synthesised and characterised using several in situ characterisation techniques. The electronic state structural evolution of material upon cycling were investigated XRD, EXAFS XANES measurements. SQUID magnetic measurements showed that initial contains a certain amount Mn3+ low spin configuration (average Mn oxidation state: +3.75). In first part charge (up to 4.4 V vs. Li+/Li) corresponds fraction,...
This paper deals with the occurrence of a graphite irreversible degradation mechanism in commercial Graphite (C) / lithium Nickel Manganese Cobalt oxide (NMC) lithium-ion batteries, challenging metallic deposition as major aging at low temperature cycling. In this study, 16 Ah C/NMC Li-ion cells were aged during cycling 5°C rate 1C between 2.7 V and 4.2 (namely 0 100% state charge (SOC), respectively), significant performance fading after 50 cycles only, while up to 4000 can be performed...
The evolution of lithium-containing species on the surface grains layered material during aging process in (ethylene carbonate/dimethyl carbonate, ) electrolyte has been followed using magic angle spinning NMR spectroscopy. Materials displaying different areas have investigated order to study influence surface/volume ratio. signal shows that reaction active with is extremely fast first moments exposure and tends slow down for longer times. Coupled NMR, electrochemical impedance spectroscopy,...
In recent decades, rechargeable Mg batteries (RMBs) technologies have attracted much attention because the use of thin foil anodes may enable development high-energy-density batteries. One most critical challenges for RMBs is finding suitable electrolyte solutions that efficient and reversible cells operation. Most RMB studies concentrate on novel systems, while only few focused practical feasibility using pure metallic as anode material. Pure metal been demonstrated to be useful in studying...
Magic angle spinning solid state NMR is generally used to characterize bulk materials. We show here that it also a promising tool detect and the diamagnetic surface layer on paramagnetic material, which novel development. apply this technique very hot topic of positive electrode/electrolyte characterization in field lithium rechargeable batteries. report 7Li MAS study physisorbed layers LiNi1/2Mn1/2O2, electrode material for ion signals arising from formed by mixing with carbonate or contact...
Abstract The ageing phenomena occurring in various diethyl carbonate/LiPF 6 solutions are studied using gamma and pulse radiolysis as a tool to generate similar species the ones electrolysis of Li‐ion batteries (LIBs). According picosecond experiments, reaction electron with (Li + , PF − ) is ultrafast, leading formation fluoride anions that can then precipitate into LiF(s). Moreover, direct radiation‐matter interaction salt produces reactive fluorine atoms forming HF(g) C 2 H 5 F(g). strong...