PhD (M/F): Understanding and Control of Inhomogeneous Deposition in Lithium Metal Batteries Under Asymmetric Charging and Discharging Conditions

Job Description

Thesis Subject

Lithium metal batteries represent a promising pathway toward significantly increasing the energy density of electrochemical energy storage systems. However, their development is hindered by the formation of inhomogeneous lithium deposits, which can degrade cell performance and compromise safety. Recent studies suggest that asymmetries between the charge and discharge phases play a major role in these phenomena, yet the underlying mechanisms remain poorly understood.

The objective of this PhD project is to elucidate the physicochemical mechanisms responsible for lithium anode degradation induced by asymmetric operating conditions. A thorough understanding of these mechanisms is a prerequisite for the development of effective mitigation strategies. The knowledge gained will be used to design innovative solutions aimed at stabilizing the lithium–electrolyte interface and suppressing inhomogeneous lithium deposition. Two complementary approaches will be investigated: electrolyte engineering through the incorporation of functional additives that promote the formation of stable interphases, and the design of hybrid protective coatings with composition gradients on the lithium metal surface to homogenize ionic fluxes and interfacial reactions.

The project will rely on a combination of advanced electrochemical techniques, including coin-cell cycling, electrochemical impedance spectroscopy (EIS), and Coulombic efficiency measurements. These will be complemented by operando characterization using fiber-optic infrared spectroscopy to monitor interfacial evolution in real time, as well as state-of-the-art post-mortem analyses (X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), focused ion beam scanning electron microscopy (FIB-SEM), and infrared spectroscopy (IR)) to correlate interfacial composition and structure with electrochemical performance.

This PhD project will provide the candidate with the opportunity to develop expertise at the intersection of electrochemistry, materials science, and advanced characterization techniques, within a strategically important field for the next generation of high-energy-density batteries.

Candidate Profile:
The candidate should hold a Master's degree (M.Sc.) or an engineering degree in chemistry, materials science, electrochemistry, or a related discipline, and have a strong interest in functional materials and electrochemical energy storage. Prior knowledge of electrochemistry and/or materials characterization will be considered an asset. Scientific curiosity, independence, rigor, and the ability to work effectively as part of a team are essential qualities for successfully carrying out this research project.

Your Work Environment

This PhD project will be carried out within the Chair of Solid-State Chemistry and Energy at the Collège de France, led by Professor Jean-Marie Tarascon, an internationally recognized leader in the field of batteries and electrochemical energy storage. Located in the heart of Paris's Latin Quarter, the Chair provides an outstanding research environment that combines fundamental research with innovation for next-generation energy storage technologies. The PhD candidate will benefit from access to state-of-the-art research facilities, interactions with internationally renowned scientists, and a highly stimulating scientific environment in a field of strategic importance for the energy transition.

This PhD project is conducted within the framework of a collaboration between the Collège de France and Blue Solutions.

Constraints and risks

non

Compensation and benefits

Compensation

2300 € gross monthly

Annual leave and RTT

44 jours

Remote Working practice and compensation

Pratique et indemnisation du TT

Transport

Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€

About the offer

About the CNRS

The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.

CNRS

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