The work will be performed at LPEM-ESPCI in the group of Dr. Brigitte Leridon
in collaboration with the group of Pr. Stéphane Holé and in the framework of a
dynamical ANR network generating numerous collaborations;
Recent reports (1,2) demonstrate the need for increasing the share of
renewable energies, as well as of electrical transportation in the overall
energy mix, in order to decarbonate the energy production and/or use and limit
the temperature increase. Both aspects will need efficient and reliable
electrical energy storage solutions. The issue is also that these energy
storage solutions be sustainable and safe, which is far from being the case
for the leading technology, namely the Li-ion battery.
By exploiting solid-state properties of some titanate-based perovskites
systems we demonstrated the possibility of developing all-solid Li-free, Co-
free energy storage systems. These solid-state materials demonstrate a
remarkable ion conductivity of about 1 mS/cm with an extremely low electronic
conductivity (mower than 10 nS/cm) at room temperature, which makes them
interesting for a large variety of applications. In some experimental
situations however, the electronic contribution is found to strongly increase
and become dominant, which can also be advantageous.
The mlcroscopic mechanisms at play behind the observed behavior remain to be
investigated. What makes that electrons are localized in a material while ions
are delocalized is a subtle problem. What makes that under small structure
variations, or peculiar stimulations, the situation is reversed is what we aim
The aim of this PhD project is therefore to tackle by a variety of
experimental and theoretical techniques the fundamental mechanisms at play in
these (and related) materials.
The candidate will be trained to use a variety of experimental techniques:
electrical measurements, Electron microscopy (HRTEM, XPS…), Infrared and
Raman spectroscopy, XDR and neutron diffraction, benefitting from a rich
collaborative network (ANR MIMETIX project). He (she) will also perform ab
initio simulations such as DFT and molecular dynamics.
The project will expose the student to a rich domain at the frontier of
fundamental physics and chemistry with a large variety of experimental and
modelling techniques, adding up various techniques to the students skills
portfolio. It will also expose the student to an environment spanning from
fundamental physics and chemistry to applicative devices, and will open
carrier possibilities both in the academia and private sectors.
We are looking for a highly-motivated candidate, with a Master degree in
Solid-State Physics or Material Physics, able to interact within a dynamical
research network, to work and think independently and to be a force of
This thesis is fully granted through an ANR project.
Research Field: Physics › Condensed matter properties Physics › Solid
Scientific environment The candidate will work mainly at IMN laboratory in
addition with numerous characterization techniques (XRD, MEB, HR-TEM, XPS,
Realization and optimization of synapses...
Research Field: Chemistry Physics Technology › Energy technology
electrical energy storage solutions.
the possibility of developing all-solid Li-free, Co-free energy storage
These solid-state materials demonstrate a remarkably hio ion
temperature, which makes them interesting for...