Intitulé de l'offre : CNRS PhD Thesis position (M/W) to achieve a Unified Understanding of the Zinc-Ion Battery Chemistry from Multiscale Operando Investigations (H/F)
Référence : UMR6502-JOEGAU-001
Nombre de Postes : 1
Lieu de travail : NANTES
Date de publication : vendredi 7 avril 2023
Type de contrat : CDD Doctorant/Contrat doctoral
Durée du contrat : 36 mois
Date de début de la thèse : 4 septembre 2023
Quotité de travail : Temps complet
Rémunération : 2 135,00 € gross monthly
Section(s) CN : Materials, nanomaterials and processes chemistry
Description du sujet de thèse
GENERAL CONTEXT: Aqueous zinc batteries (ZnB) constitute a promising technology, with a reduced operational risk and environmental impact compared to lithium ones to leverage load and power output in the electrical grid.
SCIENTIFIC PROBLEM: Repeated zinc electrodeposition dissolution during charge and discharge of ZnB leads to hydrogen evolution, dendrite growth and eventually battery failure. Recently, new types of aqueous electrolytes have shown to suppress these issues. However, from the fundamental point of view, the rational of the underlying mechanisms has been recently questioned mainly because the interfacial chemistry at play at the electrolyte/zinc surface during battery cycling remains unknown.
OBJECTIVE OF THE WORK: To achieve a unified understanding of the dynamical interfacial chemistry (ion solvation shell, local pH, hydrogen evolution…) and zinc morphology (dendrites, passivation products…) evolution during cycling, the work will involve the development of a methodology based on a set of operando characterization tools that can probe both the interfacial region (<10nm) and the first part of the diffuse layer (<3micrometer) of a series of these new electrolytes.
THREE SCIENTIFIC CHALLENGES will be addressed (i) tracking the electrolyte chemistry by using local operando vibrational spectroscopies (ii) tracking the zinc topology and hydrogen evolution by electrochemical quartz crystal microbalance, (iii) unifying all results through selected series of new electrolytes.
Contexte de travail
L'Institut des Matériaux de Nantes (IMN) brings together chemists, physicists and materials engineers. With more than 200 researchers and support staff, it is now one of the largest materials research centers in France. Research projects are varied, including strong collaborations with industry and other national and international research organizations. IMN is interested in the fundamental understanding of materials science and their properties from the atomic scale. This enables the design, characterization and optimization of new materials for a diverse range of high-tech applications, including solar cells, fuel cells, electric car batteries, nanotechnology, smart materials, materials for microelectronics, photonic and optical materials. More specifically, the activity of the Electrochemical Energy Storage and Conversion (ST2E) team in which the work will be carried out is based on the synthesis and advanced characterization of materials and the analysis of the mechanisms involved in the operation of electrochemical energy storage or conversion devices.
Joel Gaubicher is a CNRS research director and Ivan Lucas is an assistant professor at Sorbonne Université
Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.
Contraintes et risques
No specific risk other than those occuring in chemistry labs
The candidate: Applicants should have a Master or Engineer degree in a relevant chemistry or materials science discipline. Interest and enthusiasm for advanced physical characterization techniques and electrochemistry will be an advantage. Candidates should be highly motivated, open‐minded, dynamic and team player person to work with post doctorate fellow and master students of the project. They should have good organization and communication skills. This PhD work will be at the heart of a 3.5 years ANR project involving three partners (CEISAM and CEA in France as well as CIC Energigune in Spain).