M/F PhD student in Materials Science

Updated: 12 months ago
Location: Tremblay en France, LE DE FRANCE
Deadline: 10 Sep 2019

Created in 1995, the Bordeaux Institute of Condensed Matter Chemistry (ICMCB)
focuses its research on Solid Chemistry, Materials Science and
Molecular Sciences: designing, preparing, shaping and characterizing
materials to discover, master and optimize specific functions.
The ICMCB conducts fundamental research on model materials and / or
likely to have applications.
The complementarity of approaches and the synergy thus created have allowed the Institute
to strengthen its national and international position in the field of materials

Lithium-ion battery technology is the main contributor to the electrification of vehicles. In particular, lithium-rich lamellar oxides Li1 + xM1-xO2 (where x is between 0 and 0.25 and M is a 3d cation or a mixture of several 3d cations) have been extensively studied as electrode materials. positive in lithium-ion batteries to do their high capacity (more than 250 mAh / g).
The main objective of this thesis is to synthesize new lamellar oxides rich in lithium and to study the structural and electrochemical behavior of such oxides during (de) lithiation. The (de) lithiation mechanism is indeed complex and involves phase transitions and structural rearrangements and many fundamental questions remain unresolved, which considerably hampers the development of these materials for use in real batteries. This research project aims to:
- Synthesize new oxides in lithium-rich layers by solid state chemistry, followed by ion exchange reactions
- Characterize the structure and the microstructure of new materials
- Understand the electrochemical performances during the first cycles

The techniques used in the thesis will be the techniques usually used in solid-state chemistry, with a strong involvement of the student for:
- synthesis of new materials for solid state reactions
- assembly and cycling of lithium batteries
the structural and microstructural analysis of the initial materials and after cycling by powder X-ray diffraction, electron diffraction, transmission and scanning electron microscopy.

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