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Profile | Photovoltaic solar power | Renewable energies
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Dr. Hab.
Sylvie Geniès completed her PhD research on Li-ion batteries at LEPMI in Grenoble in 1995, focusing on the negative graphite electrode-electrolyte interface. She then pursued postdoctoral research on lithium-metal polymer batteries at EDF's Les Renardières Research Center in Moret-sur-Loing, at the Condensed Matter Physics Laboratory (LPMC) at École Polytechnique in Palaiseau, and at the Reactivity and Solid State Chemistry Laboratory (LRCS) in Amiens.
This experience was followed by five years with a lead-acid battery manufacturing company. In 2005, she came to CEA-Liten to study the durability of lead batteries for solar power.
She has been a research scientist in CEA-Liten's Hydrogen Energy and Transportation Department since 2009. Today, her research focuses almost exclusively on lithium-ion technology and, specifically, degradation mechanisms in Li-ion systems with liquid or solid electrolytes, which she studies using post-mortem and operando characterization techniques.
- Ex situ and operando electromechanical and physicochemical characterization to identify degradation mechanisms in Gen3 and Gen4 Li-ion batteries;
- Component-level evaluation of physical and electrochemical parameters for Newman-type multiphysics modeling.
By combining two AI models with transfer learning techniques, researchers from CEA-Liten and CEA-Leti have managed to estimate the state of health of Li-ion batteries with unprecedented levels of accuracy. What’s more, these results were based on a real-world dataset of just 40 cells! This major breakthrough will help improve battery use and extend their lifespan.
All-solid-state batteries are a promising avenue for the next generation of energy storage systems, especially for electric vehicles, aerospace and defense. It could increase the - energy density at the cell level by up to 50% while also improving system safety. One of the main challenge to industrialize this technology is to scale up the fabrication of very thin and uniform lithium metal negative electrode In 2022, the CEA, Saft (a TotalEnergies company), and Automotive Cells Company (ACC) kicked off a joint R&D project to address these issues. The initial results have just been published.
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CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.