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Nano-silicon/graphene composites for high energy density lithium-ion batteries

ABG-75432 Emploi Junior
13/02/2018 CDD 24 Mois > 35 et < 45 K€ brut annuel
Commissariat à l'Energie Atomique et aux Energies Alternatives - Groupe
Grenoble - Auvergne-Rhône-Alpes - France
  • Chimie
  • Sciences de l’ingénieur
battery, energy, synthesis, nanoparticle, nanowire, composite
Recherche et Développement

Employeur

CEA is the leading public research institution in energy research in France. With a 16,000 employee task force, CEA conducts its research activities from the most fundamental level to industrial transfer around its 4 main expertise domains: low carbon energies, defense and security, and health and communication technologies. The present project takes place in the fundamental research division of CEA in the research institute INAC at Grenoble. INAC is a joint CEA-university institute of 500 researchers with strong expertise in nanosciences, namely photonics, new technologies for energy, nanoelectronics, biosensors, polymer chemistry.

Poste et missions

This postdoctoral fellowship is part of a Graphene Flagship H2020 european project on the energy storage applications of graphene. In lithium-ion batteries, graphene associated to nanostructured silicon in a proper composite helps increase the energy capacity. Indeed graphene wraps silicon, reducing its reactivity with electrolyte and the formation of the SEI passivation layer. It also maintains a high electrical conductivity within the electrode.

The study will compare two technologies: graphene-silicon nanoparticles and graphene-silicon nanowires. The former composite, already explored in the above mentioned project, will be optimized in the present study. The latter is a new kind of composite, using a large scale silicon nanowire synthesis process recently patented in the lab. The work will take place within two laboratories: a technological research lab (LITEN) with expertise in batteries for transportation, and a fundamental research lab (INAC) with expertise in nanomaterial synthesis.

The postdoc associate will synthesize silicon nanowires for his/her composites at INAC. Following LITEN know-how, she/he will be in charge of composite formulation, battery fabrication and electrochemical cycling. He/she will systematically compare the electrochemical behavior of the nanoparticle and nanowire based silicon-graphene composites. Comparison will extend to the mechanism of capacity fading and SEI formation, thanks to the characterization means available at CEA Grenoble and in the European consortium: X-ray diffraction, electronic microscopy, XPS, FTIR, NMR spectroscopies. She/he will report her/his work within the international consortium (Cambride UK, Genova Italy, Graz Austria) meetings.

PhD in materials science is requested. Experience in nanocharacterization, nanochemistry and/or electrochemistry is welcome.

Mobilité géographique :

Pas de déplacement

Prise de fonction :

01/05/2018

Profil

Applicants should hold a PhD in materials science and feel strongly appealed towards multidisciplinary research. Experience in nanosciences/energy storage will be considered favorably.

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