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DTSTART;TZID=Europe/Paris:20260306T093000
DTEND;TZID=Europe/Paris:20260306T093000
DTSTAMP:20260409T183649
CREATED:20260224T145100Z
LAST-MODIFIED:20260409T131239Z
UID:3602-1772789400-1772789400@www.cnrs-imn.fr
SUMMARY:Raymonda DIAB's thesis defense (co-dir. ST2E)
DESCRIPTION:Towards Fast and Safe Recharging of Li-ion Batteries: Design\, Parameterization and Experimental Validation of a Pseudo-2D Electrochemical Model Based on Homogenization\nAbstract: Fast charging of lithium-ion batteries remains a major challenge due to degradation\, safety risks and ageing. Preventing lithium metal deposition during fast charging requires dynamic current adjustment to keep the negative electrode potential above 0 V vs. Li+/Li. Since this potential is inaccessible to direct measurement in commercial batteries\, we propose a new variant of the pseudo-bidimensional electrochemical model\, enabling real-time estimation of the potential profile across the thickness of the electrodes. A non-linear state representation is obtained from the coupled partial differential equations of the system\, via an electrode homogenization approach and non-uniform grid discretization. Experimental parameterization of the model is performed using a three-electrode setup. The model exhibits robust numerical stability\, enabling reliable simulations down to 10C. Finally\, its predictive capability is demonstrated by validation coupled with parameter estimation for constant load regimes between 2C and 6C.        \nKeywords: Lithium-ion battery\, Fast charging\, Pseudo-2D model\, Parameterization\, Homogenization technique\, Lithium deposition \n\nTowards Safe Fast Charging of Li-ion Batteries: Design\, Parameterization\, and Experimental Validation of a Homogenization-Based Pseudo-2D Electrochemical Model\nAbstract: Despite the growing demand for shorter charging times\, fast charging of lithium-ion batteries remains challenging due to performance degradation\, safety risks\, and aging constraints. Preventing lithium plating during fast charging necessitates dynamically adjusting the charging current to keep the negative electrode potential above 0 V vs. Li+/Li. As this potential is not directly measurable in commercial cells\, this work develops a novel pseudo-two-dimensional electrochemical model variant. The model enables realtime estimation of the through-thickness potential profile in each electrode. Derived from coupled partial differential equations via electrode homogenization and a non-uniform grid\, the model is formulated as a non-linear statespace system. The experimental parameterization of the model is achieved using a threeelectrode assembly. The model demonstrates robust numerical stability\, enabling reliable simulations at rates as high as 10C. Finally\, the model’s predictive capability is demonstrated through simultaneous validation and parameter estimation across charging rates of 2C to 6C.         \nKeywords: Lithium-ion battery\, Fast charging\, Pseudo-2D model\, Parametrization\, Homogenization Technique\, Lithium plating
URL:https://www.cnrs-imn.fr/en/event/raymonda-diabs-thesis-defense-co-dir-st2e/
LOCATION:IREENA Saint-Nazaire
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/02/diab_raymonda.jpg
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DTSTART;TZID=Europe/Paris:20260311T140000
DTEND;TZID=Europe/Paris:20260311T160000
DTSTAMP:20260409T183649
CREATED:20260306T161929Z
LAST-MODIFIED:20260306T161929Z
UID:3430-1773237600-1773244800@www.cnrs-imn.fr
SUMMARY:George HARRINGTON Seminar
DESCRIPTION:Wednesday\, March 11 at 2:00 pm -Amphi IMN \n \nGeorge HARRINGTON\nDepartment of Chemistry at Bath University\, UK \n  \nMaterials chemistry challenges in the green energy transition: From electrode kinetics to scalable recycling routes\n\n  \nAbstract \nThe global transition toward green and sustainable energy systems presents a series of challenges from a materials chemistry perspective. Central among these is the need to develop energy-conversion and storage technologies that are efficient\, high-performing\, and durable over operational lifetimes. Equally critical is the requirement that the manufacturing of these devices be scalable within the constraints of raw material supply and designed with viable end-of-life pathways.   \nThe first part of this seminar focuses on developing approaches to improve the performance solid oxide cells (SOCs)\, key technologies capable of decoupling the production of synthetic fuels\, chemicals\, and commodities from fossil fuels underpinning various power-to-X scenarios. A central factor governing SOC performance is the reaction kinetics at the electrodes. Traditionally\, advances in SOC electrode performance have been pursued through modifications of electrode composition\, tailoring the bulk chemistry to enhance catalytic activity and transport properties. However\, recent developments have shown that significant improvements can also be achieved by tuning surface exchange kinetics through alternative mechanisms. In this talk\, we examine two emerging approaches: modifying surface chemistry via controlled changes in Smith acidity\, and exploiting ultraviolet illumination to drive favourable alterations to surface exchange behaviour. Together\, these strategies open relatively unexplored avenues for achieving high-performance electrodes.      \nThe second part of the seminar turns to broader materials-supply challenges for next-generation energy devices. As technologies such as SOCs move toward large-scale deployment\, the identification of potential raw material constraints must be identified early in the materials and device design. At the same time\, materials in early commercialisation stages require carefully designed end-of-life strategies to prevent the emergence of difficult-to-manage waste streams. Niobium oxide-based materials have recently emerged as high-power\, durable battery anodes\, and are now in the early stages of commercialisation. Yet their refractory nature\, combined with the wide range of dopant chemistries employed\, presents substantial challenges for future recycling efforts. In this work\, we demonstrate a route to address this challenge through an aqueous-based recycling process that relies only on inexpensive\, widely available reagents\, offering a feasible path toward sustainable end-of-life management for niobium-based energy materials.      \n  \nContact: Clément Nicollet (ST2E)
URL:https://www.cnrs-imn.fr/en/event/george-harrington-seminar/
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/03/George_Harrington.jpg
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DTSTART;TZID=Europe/Paris:20260312T133000
DTEND;TZID=Europe/Paris:20260312T150000
DTSTAMP:20260409T183649
CREATED:20260324T152649Z
LAST-MODIFIED:20260324T152649Z
UID:3769-1773322200-1773327600@www.cnrs-imn.fr
SUMMARY:Jeudis de la Chimie du Solide seminar - Yann Le Godec (IMPMC Paris)
DESCRIPTION:Thursday\, March 12 at 1:30 p.m. by videoconference\n \nYann Le Godec \nInstitute of Mineralogy\, Physics of Materials and Cosmochemistry (IMPMC Paris) \n\nSynthesis under extreme conditions of new lightweight materials with remarkable properties\n  \nSummary: Modern high-pressure chemistry is today a vast and dynamic field of research\, offering promising prospects for the development of new materials of industrial interest. Although this discipline is still relatively young compared with conventional chemistry\, it is already revealing exceptional potential that remains largely unexplored. Its pioneering nature and revolutionary prospects make it a veritable scientific terra incognita\, justifying the growing interest it is arousing.   \nIn this context\, recent advances in X-ray diffraction under extreme conditions have revolutionized the methods used to explore these new territories\, paving the way for unprecedented discoveries. Over the past decade\, intensive use of in situ synchrotron radiation has enabled direct observation of the synthesis pathways of new materials\, whether stable or metastable\, under extreme conditions. These materials\, often inaccessible by conventional methods\, feature remarkable properties such as high-temperature superconductivity\, exceptional hardness and optimized photovoltaics.   \nIn-situ observation of synthesis processes now enables much more precise determination of the thermodynamic conditions required to access metastable states. In this presentation\, I will show that combining very high pressures and temperatures with in situ X-ray diffraction probes using synchrotron radiation is an essential methodological key to controlling the composition and microstructure (nanostructuring) of new materials (borides\, carbides\, silicon compounds\, etc.) with exceptional properties.
URL:https://www.cnrs-imn.fr/en/event/jeudis-de-la-chimie-du-solide-seminar-yann-le-godec-impmc-paris/
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/02/yann_legodec.jpg
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