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DTSTART;TZID=Europe/Paris:20260311T140000
DTEND;TZID=Europe/Paris:20260311T160000
DTSTAMP:20260409T230531
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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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260306T093000
DTEND;TZID=Europe/Paris:20260306T093000
DTSTAMP:20260409T230531
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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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260213T093000
DTEND;TZID=Europe/Paris:20260213T120000
DTSTAMP:20260409T230531
CREATED:20260129T171722Z
LAST-MODIFIED:20260409T125851Z
UID:3435-1770975000-1770984000@www.cnrs-imn.fr
SUMMARY:Thesis defense of Aswadh S. SAJEEVAN (ST2E)
DESCRIPTION:Friday\, February 13 at 9:30 a.m.\n \n\nLi-Organic Solid Polymer Electrolyte Batteries: Integration of Lithiated p-Dihydroxyterephthalate Salts\, Electrochemical Properties and Recycling Strategy\nSummary: Organic electrode materials offer a promising route to the development of more sustainable batteries\, by reducing dependence on critical metals. Among them\, p-dihydroxyterephthalate derivatives feature high operating potentials and scalable structures. This thesis investigates how their redox properties\, electrode architecture and compatibility with solid polymer electrolytes can be optimized to improve the performance of lithium-organic batteries.   \nThe first part examines zinc(II) (2\,5-dilithium-oxy)-terephthalate\, which adopts a lamellar structure and exhibits stable monoelectronic electrochemical activity at a potential of 3.4 V vs. Li+/Li. The second part evaluates magnesium and zinc derivatives in flexible all-solid-state cells using poly(e-caprolactone-trimethylene carbonate) electrolytes. At 60°C\, the polymer electrolyte ensures high ionic conductivity and performance comparable to that observed with liquid electrolytes. The third section focuses on copper(II) (2\,5-dilithium-oxy)terephthalate. Although the bulk material exhibits limited electrochemical activity due to large aggregates\, the synthesis of a carbon-based composite with high specific surface area leads to a nanostructured system that provides access to the full faradic capacity of this organic structure\, but at the expense of sufficient cycling stability. Finally\, the fourth section reports on a pioneering study into the recycling of magnesium(II) (2\,5-dilithium-oxy)-terephthalate-based electrodes.      \nKey words: Organic electrode materials\, Polymer electrolytes\, Battery recycling\, Lithium batteries. \n\nTowards Soft Solid-State Li-Organic Batteries: Implementation of Lithiated p-Dihydroxyterephthalate-Based Positive Electrode Materials\, Electrochemical Properties\, and Recycling Strategy\nAbstract: Organic electrode materials offer a promising route toward sustainable lithium-based batteries by reducing reliance on scarce metals. Among these\, p-dihydroxyterephthalate derivatives provide high operating potentials and tunable structures. This thesis investigates how their redox properties\, electrode architecture\, and compatibility with solid polymer electrolytes can be optimized for improved performance.   \nThe first part examines zinc(II) (2\,5-dilithiumoxy)-terephthalate\, which forms a lamellar structure and shows stable one-electron activity near 3.4 V vs Li+/Li. The second part evaluates magnesium and zinc derivatives of this material in soft solid-state cells with poly(e-caprolactoneco-trimethylene carbonate) based solid polymer electrolytes. At 60 °C\, the polymer electrolyte provides high ionic conductivity and delivers performance comparable to that observed with liquid electrolytes. The third part focuses on copper(II) (2\,5-dilithium-oxy)-terephthalate. Although the bulk material shows limited electrochemical activity due to large aggregates\, the synthesis of a composite based on high surface area carbon yields a nanostructured system that enables access to the full faradaic capacity of this organic framework\, albeit at the expense of adequate cycling stability. Finally\, the fourth part reports a pioneering study on the recycling of magnesium-based (2\,5-dilithium-oxy)-terephthalate electrodes.      \nKeywords: Organic electrode materials\, Polymer electrolytes\, Battery recycling\, Lithium batteries
URL:https://www.cnrs-imn.fr/en/event/thesis-defense-of-aswadh-s-sajeevan-st2e/
LOCATION:Amphi IMN
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/01/SAJEEVAN_Aswadh.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260212T133000
DTEND;TZID=Europe/Paris:20260212T170000
DTSTAMP:20260409T230531
CREATED:20260129T171640Z
LAST-MODIFIED:20260409T083106Z
UID:3771-1770903000-1770915600@www.cnrs-imn.fr
SUMMARY:Solid State Chemistry Seminar - Camila Campos (IMEC Belgium)
DESCRIPTION:Camila Campos (IMEC Belgium) \nExploiting the electric response of materials for improved analytical performance
URL:https://www.cnrs-imn.fr/en/event/solid-state-chemistry-seminar-camila-campos-imec-belgium/
LOCATION:Videoconferencing
ATTACH;FMTTYPE=image/jpeg:https://www.cnrs-imn.fr/wp-content/uploads/2026/01/Camila_Campos.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260205T090000
DTEND;TZID=Europe/Paris:20260205T120000
DTSTAMP:20260409T230531
CREATED:20260123T095352Z
LAST-MODIFIED:20260123T095352Z
UID:3772-1770282000-1770292800@www.cnrs-imn.fr
SUMMARY:XPS Theoretical Training
DESCRIPTION:
URL:https://www.cnrs-imn.fr/en/event/xps-theoretical-training/
LOCATION:Amphi IMN
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