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Reference : UMR8234-JONSOT-002
Workplace : PARIS 05
Date of publication : Tuesday, June 30, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 October 2020
Proportion of work : Full time
Remuneration : The monthly salary is about € 2 960,00 gross.
Desired level of education : 5-year university degree
Experience required : Indifferent
All-solid-state batteries (ASSBs) have the potential to outperform current lithium ion battery technology in terms of safety and energy density. ASSBs are therefore particularly attractive for electric mobility. Their favourable properties are enabled by the use of an inorganic solid electrolyte (instead of a flammable organic liquid) which further permits the use of the high energy density lithium metal anode. Despite the fact that several SEs with high enough ionic conductivity exist, ASSBs with long operational life are still scarce. Several challenging stability issues at the interfaces due to either chemical, electrochemical, or mechanical problems limiting the energy density and battery lifetime must still be addressed before successful commercialization of ASSB technology. Preventing the failure mechanisms in ASSBs and thereby contributing to the advancement of this technology requires that we understand how the various components of the battery interact with each other at the solid/solid interfaces.
The characterization of these interfaces is a challenging task, especially when performed in situ during battery assembly or operation and requires advanced methods. In this perspective, the PostDoc will contribute to the design and commissioning of apparatus at SOLEIL synchrotron that can be used to study interfacial (in)stability in ASSBs using X-ray spectroscopic techniques (Photoelectron Spectroscopy, XPS, in particular). Such in situ/operando studies will reveal key information for the understanding of the reactivity (chemical, electrochemical) and dynamics (formation and evolution of interphases) at these hardly mastered interfaces and thereby allow for technological progress.
Model systems will further be characterized by electrochemical methods (galvanostatic cycling, cyclic voltammetry and electrochemical impedance spectroscopy) in symmetric cells in order to correlate the chemistry at interfaces with electrochemical behaviour.
The Postdoctoral Research Fellow will be in charge of designing/testing the electrochemical cells or sample environments for spectroscopy characterization (XPS in particular), planning/realizing experiments and analyzing sets of data. Therefore, we are looking for a materials scientist and/or (electro-)chemist who is highly motivated by instrumental design and advanced characterization techniques at large scale facilities. Previous working experience in electrochemical energy storage research, surface science and/or spectroscopic measurements would be a strong asset. A good command - written and oral - of English is required. The knowledge of the French language is an advantage.
We are seeking a highly motivated, enthusiastic and hard-working candidate with the ambition to gain new insights and to present the results in leading, international journals. The applicant must show good interpersonal skills and be willing to work in close collaboration with the hosting team and other partners, as well as have the ability to work independently.
The Postdoc will be hosted at SOLEIL synchrotron (Paris-Saclay Campus, Gif-sur-Yvette, www.synchrotron-soleil.fr) and strongly interact with a team of researchers and engineers at PHENIX laboratory at Sorbonne University (Paris, www.phenix.cnrs.fr) and CSE laboratory at Collège de France (Paris, www.solid-state-chemistry-energy-lab.org). The travelling time between SOLEIL and the laboratories in Paris is about 1h20min by public transportation. The applicant will further interact with other members of the RS2E (www.energie-rs2e.com), in particular researchers from IPREM laboratory at Pau University (https://iprem.univ-pau.fr) which is renowned for XPS analysis of electrochemical systems. The Postdoctoral Research Fellow will thus evolve in a multidisciplinary collaborative research environment and benefit from the available expertise in electrochemistry, materials science, synchrotron research and operando characterization of batteries.
Constraints and risks
The successful candidate is expected to spend approximately one day per week in one of the laboratories in Paris. Synchrotron experiments will take place during allocated beam time which may require up to seven days of presence at the synchrotron together with the team of researchers and may involve work during night hours. At least one week of synchrotron experiments is foreseen in the framework of the current project. The candidate may have the opportunity to spend longer research stays in RS2E partner laboratories (e.g. IPREM), to participate in schools and to present research results in conferences. National and international travels should thus be expected.
Please include the following document in your application:
- Cover letter including a description of scientific interests and the motivation for applying for the position (max. 2 pages)
- CV (summarizing education, positions and academic work - scientific publications)
- Copies of the original PhD diploma in physics, chemistry or materials science and letters of recommendation
- Names and contact details of 2-3 references (name, relation to candidate, e-mail and telephone number)
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