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Reference : UMR5266-MURVER-001
Workplace : ST MARTIN D HERES
Date of publication : Wednesday, September 16, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 November 2020
Proportion of work : Full time
Remuneration : 2648 à 3054€ depending on experience
Desired level of education : PhD
Experience required : 1 to 4 years
This post-doctorate is part of the ANR DESTINA-ion_Operando framework. The main objective of this ANR project is the development of instrumental methodologies based on in situ liquid / electrochemical TEM for the study of the dynamics of lithiation (and sodiation) in individual particles of positive electrode materials for Li-batteries. ion and Na-ion.
Indeed, inhomogeneity of the reactions of insertion of ions within the crystals is strongly dependent on the solid-liquid interfaces (crystal / liquid electrolyte) and solid-solid (crystal / current collector), and is at the origin of the stresses, mechanical fractures and migrations of elements (V, Mn, O) which degrade the reversibility of electrochemical reactions. These defects of uniformities present at the nanometric scale are at the origin of difficulties of interpretation between the evolution of the electrochemical properties and the mechanisms of insertion of the ions. Thus, quantification of these structural inhomogeneities, their interfaces and their evolutions according to the state of charge and electrochemical cycling regime is the key to provide a better understanding of the processes at the origin of the degradation of capacity retentions. Na-ion and Li-ion batteries.
In the ANR project, we propose to develop 2 Operando experimental approaches based on the use of an electrochemical TEM sample holder in order to follow, in real time (fast camera) and at the nanometric scale, the structural modulations induced by the mechanisms insertion into individual crystals. The developments will be carried out on the one hand, from electron diffraction in tomography mode and dark field imaging, and on the other hand, from phase and crystal orientation mapping (ACOM).
- Diffraction Data acquisition using ACOM-TEM
- Diffraction pattern quality improvment
- Phases and structure determination
- Participation and presentation in ANR meetings
- TEM user
- Good knowledge in crystallography
- Team work
SIMaP was created in 2007 from association of three former laboratories of the CNRS (the national center for science), Grenoble INP (the group of graduate engineering schools) and UGA (the University of Grenoble Alpes).
In 2020, the laboratory brings together about 200 collaborators: 60 faculties and researchers, 15 emerita, 42 technical and administrative staff, 80 PhD and post doc and about 30 trainees from engineer degrees to masters. SIMaP is localized on the « east campus » of Grenoble, on the city of Saint Martin d'Hères and spans over about 6300 m2 of buildings of Grenoble–INP.
Researchers are in the fields of chemistry, physics, mechanical properties of materials and fluids and thermic and work on the conception of processes and synthesis of materials. SiMaP is one the leading laboratory for physical metallurgy and thermodynamics as well as architectural materials.
The post-doctorant will work under the supervision of Pr. Muriel VERON (PM team), in close collaboration with Dr. Edgar Rauch (GPM2 team).
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