Postdoctoral position (M/F) on impedance and dielectric study of solid/solid interfaces in batteries

Job Description

Missions

Boradband dielectric spectroscopy and electrochemical impedance spectroscopy (BDS & EIS) are classical approaches for battery electrode characterization. Actually, BDS & EIS are one of the most practical analysis techniques, which can discriminate charge carrier transport and electrochemical processes by their time constant.
In that matter, BDS can decipher between ionic/electronic limitations in composite electrodes, depending on their morphology (porosity, tortuosity, additives amount…).
On another side EIS is particularly interesting since it is a non-destructive investigation method, giving access to several electrochemical parameters of major interest in the full battery (charge transfer, passivation film, adsorption, corrosion, ionic diffusion, tortuosity...).

Activity

As a Postdoctoral Researcher specialized in your field, you are expected to conduct the following experimental work:
* Fabricate LIB electrodes from graphite powder mixed with binder particles. For that purpose a classical liquid-media methodology will be used: powders mixing, ink preparation, coating/drying on metallic foil, calendering... Different electrode compositions, mass loadings, and thicknesses will be targeted.
* Assemble the fabricated electrodes into specific cells, symmetric cells, full cells
* Carry out BDS tests at electrode level and EIS experiments at cell level and test the overall dielectric/impedance properties at different temperatures.

Your Profil

Skills

Materials science
Electrochemistry
Battery
Impedance spectroscopy

Your Work Environment

Lithium-ion batteries (LIB) are the primary energy storage technology for modern portable electronic devices and for electric vehicles. They can also provide stationary storage for renewable energies and for grid frequency regulation. LIBs are likely to remain a dominant technology for the foreseeable future, with an enormous increase in demand. In this context, there is a strong incentive for battery manufacturers to accelerate the design of LIBs with enhanced performance, safety, and recyclability. R&D efforts are thus pursued in different areas, such as novel LIB materials and fabrication processes, or new rchitectures/technologies, such as all-solid-state-batteries. Replacement of liquid electrolyte by a solid electrolyte can solve many issues but it also brings new limitations, mostly coming from solid/solid interfaces that introduce high resistances.

Compensation and benefits

Compensation

£3,132.83 to £4,343.20 gross per month, depending on experience

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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