A5001540157- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Semiconductor materials and devices
- Extraction and Separation Processes
- Conducting polymers and applications
- Lubricants and Their Additives
- Interconnection Networks and Systems
- Graphene research and applications
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Gear and Bearing Dynamics Analysis
- Neuroscience and Neural Engineering
- Anodic Oxide Films and Nanostructures
- Dielectric materials and actuators
- Advanced ceramic materials synthesis
- semigroups and automata theory
- Microbial Fuel Cells and Bioremediation
- Ultrasonics and Acoustic Wave Propagation
- Smart Materials for Construction
- Advanced NMR Techniques and Applications
- Advanced Sensor and Energy Harvesting Materials
- Granular flow and fluidized beds
Université Grenoble Alpes
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA LITEN
2014-2024
CEA Grenoble
2014-2023
Réseau sur le Stockage Electrochimique de l'énergie
2014
Université de Picardie Jules Verne
2014
Nantes Université
2008
By analyzing Si anodes using XPS and AES, both the SEI behaviour lithiation mechanisms are studied upon cycling.
Using several characterization techniques, the failure mechanisms of nano-Si based electrodes have been studied.
Small-amplitude oscillatory rheology is used to probe the microstructure present in aqueous composite electrode slurries for lithium batteries. The materials prepared with carboxymethyl cellulose as thickener displays a solidlike behavior due buildup of three-dimensional network colloidal carbon black (CB) particles bridged by polymeric chains. This able support and inhibit settling larger particles. Thus, homogeneous morphology achieved dried good electrochemical performance displayed both...
Carbon-covered silicon nanoparticles (Si@C) were synthesized for the first time by a one-step continuous process in novel two stages laser pyrolysis reactor. Crystallized cores formed stage covered second shell mainly consisting low organized sp2 carbon. At Si/C interface carbide is absent. Moreover, presence of oxide reduced compared to materials several steps, allowing use such material as promising anode lithium-ion batteries (LIB). Auger Electron Spectroscopy (AES) analysis samples at...
The understanding of the phenomena occurring during immersion LiNi0.5Mn0.3Co0.2O2 (NMC) in water is helpful to devise new strategies toward implementation aqueous processing this high-capacity cathode material. Immersion NMC powder leads both structural modification particles surface as observed by high-resolution scanning transmission electron microscopy and formation lithium-based compounds over (LiOH, Li2CO3) greater amount than after long-time exposure ambient air, confirmed pH titration...
The stability of in water was investigated. From high-resolution transmission electron microscopy observation, energy-loss spectroscopy analyses, Mössbauer experiments, and chemical we showed that a layer is present at the grains surface after immersion water. This layer, which few nanometers thick, accompanied by an increase percentage continuous dissolution layer. If experimental conditions such as time, pH, concentration are set to optimal values, transition aqueous route for preparing...
Silicon nano-particle based electrodes are attractive for implementation in lithium ion batteries due to the improvement specific capacity over currently used graphite electrodes. Here we investigate polyacrylic acid (PAA) and polyacrylate (Li-PAA) polymer binders' role electrochemical performance of silicon nanoparticle The binders evaluated comparison sodium carboxymethyl cellulose (Na-CMC), polyether imide (PEI). Large variations cumulative irreversible is observed different after 20...
Despite many studies, silicon lithiation mechanisms remain unclear. Si amorphization induced by lithium insertion hinders the use of standard techniques characterization such as diffraction. In this paper, electrochemical is investigated using a technique surface characterization, Auger Electron Spectroscopy (AES). The first part work has been dedicated to evaluating possibility studying Li–Si alloys with AES: well-known crystalline LixSi were successfully synthesized and analyzed. Based on...
The (de)lithiation process and resulting atomic nanoscale morphological changes of an a-Si/c-FeSi2/graphite composite negative electrode are investigated within a Li-ion full cell at several current rates (C-rates) after prolonged cycling by simultaneous operando synchrotron wide-angle small-angle X-ray scattering (WAXS SAXS). WAXS allows the probing local crystalline structure. In particular, observation graphite process, revealed LixC6 Bragg reflections, enables access to respective...
Abstract The sequence of initial cycles necessary for the build‐up solid electrolyte interphase (SEI) on anode surface Li‐ion batteries (usually called formation) is a cost‐ and time‐consuming process, thus requiring further optimization. Herein, three different protocols are compared to explore possibilities reduce formation time cells without negatively affecting electrochemical performance. XPS HRTEM analyses used identify main characteristics as formed SEIs. Electrochemical tests...
The H2 bubbles resulting from the reaction of freshly prepared Si powders with water were found to impede large-scale preparation aqueous-based Si/CMC (Na-Carboxy-Methyl-Cellulose)/C slurries and could consequently prevent production composite electrode films. To understand possibly control this reaction, silicon particles (Siref) have been partially oxidized either by contact or air heating at elevated temperatures. By coupling kinetics, XRD, (HR)TEM/EELS, TGA/DSC, IR gas adsorption data,...
An effective route to enhance the volume ratio of active materials in a lithium‐ion battery (LIB) or sodium‐ion (NaB) consists increasing electrode thickness, that is, mass loading, as it reduces and weight fractions separator current collectors cell. This approach also serves reduce cost, chiefly associated with expensive polymeric separator. However, following standard industrial coating process, mechanically stable can hardly exceed an loading about 30 mg cm −2 , corresponding nominal...
The impact of porosity a negative electrode containing silicon/carbon/graphite composite on the cycling performance 18650 cells with NMC-based cathode was investigated. Anode variation between 30 and 40% led to significant difference in cycle life cells: 225 347 cycles were achieved, respectively, before drop discharge capacity 75% initial value. A detailed postmortem study anodes after formation steps conducted including measurements average mass thickness changes, electrochemical...