Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PostDocs : selection by topics

Technological challenges >> Electrochemical energy storage incl. batteries for energy transition
2 proposition(s).

See all positions

Polymer synthesis and characterizations of solid-state electrolyte for lithium-ion batteries

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire Matériaux

01-02-2020

PsD-DRT-20-0052

laurent.bernard3@cea.fr

LITEN is one of the highest European research centers in the field of the new energy technologies. LITEN research activities focus on the renewable energy, on the energy efficiency and on the high performance materials for energy. Our department is focused on the development of lithium-ion batteries to enhance both simultaneously their energy density and their safety. Standard liquid electrolytes used in actual battery are intended to be replaced by solid-state electrolyte to reach these objectives. The selected candidate will work on patented and exclusive organic materials designed to fulfill all the requirements of solid-state electrolytes. He/she will be in charge of synthesizing new organic and polymer structures. Some steps of the synthesis/process will be carried out under anhydrous conditions (i.e. Glove box or anhydrous room). The post-doc will be in charge of characterizing these materials in terms of structure (NMR, FT-IR, HPLC-MS..), nanostructure (SAXS, POM, XRD, GI-SAXS), physical properties (DSC , TGA, rheology) and electrochemical properties (EIS, cycling, electrochemical stability window measurements). He/she will be in contact with various experts in batteries and large-scale instruments. The project is part of an ANR project with several partners, dedicated to the fundamental understanding of ion diffusion/transport in soft electrolytes by means of multi-scale multi-techniques methodology. Strong and good communication skills (reporting) are expected.

Download the offer (.zip)

Li-rich transition metal sulphides as high capacity cathode materials for all-solid-state lithium batteries

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire Matériaux

01-01-2020

PsD-DRT-19-0101

frederic.lecras@cea.fr

This post-doctoral work aims at the comprehensive study of a new family of Li+ intercalation materials Li[LixTi1-x]S2 (LTS) et the assessment of their performance in all-solid-state lithium batteries based on Li2S-P2S5 glass-ceramic electrolytes. Preliminary results obtained in the lab highlight similarity in the electrochemical behaviour of these compounds with the one of their oxide counterparts, i.e. Li2MnO3-LiMO2 (M=Ni, Co,...): a dual anion- and cation-based redox process, accompanied by a more or less progressive activation, and resulting in a high reversible capacity (~300 mAh/g). The main goals of the proposed study will be (i) to achieve a clear understanding of the phenomena at stake in these materials and their influencing parameters, (ii) to optimize the materials (modification of the composition, of the particle morphology,?) in order to reach practical performance close to the theoretical ones and (iii) to assess the electrochemical behaviour when embedded in an all-solid-state device (structural evolution of LTS, LTS/LPS interfaces, cohesion of the system). Different techniques will be used for the synthesis/preparation and the structural (XRD, XPS, Raman, RPE, (XAS, EXAFS)...), chemical (Auger nanoprobe, ToF-SIMS, ICP...) and electrochemical characterization of materials, interfaces and battery components. The first part of this work (6-8 months) will be carried out at ICMCB (Bordeaux), whereas the second one, which will focus on the preparation of electrodes and all-solid-state batteries, will be conducted at CEA (Grenoble).

Download the offer (.zip)

See all positions