Aiming to close the gap with future ASSB chemistries, Solvay has developed a specific fluorinated polymer based on PVDF and a designed chemistry allowing the formation of in-situ cross-linked network. This innovation led to the development of a quasi-solid state batteries, where electrolyte is trapped in a complex hybrid network bringing advantages in processing, cost, performances and safety. CEA has a sound experience in the system, being a partner of Solvay in this technology for several years. This allowed to developed innovative processes ending in manufacturing cells of several hundred milliampere hours working for hundreds of cycles. Together the two partners have gathered their efforts resulting in more than ten patents around the technology.
The research project will be articulated on the understanding of interfacial and transport properties of the hybrid polymeric system. It will primarily focus on the impact of the various manufacturing steps on the properties of the active materials involved in the systems and on the impact of network features on attributes in conductivity, safety and mechanical properties:
- The optimization of electrochemical formation of the cell and its links with the native surfaces of the various active material will also be an important part of the work.
- This optimization will be paired with an important work devoted to surface characterization like XPS, high resolution microscopy and electrochemical AFM.
- Interfaces at various scale, between the electrolyte and active materials as well as between the layers, will constitute a major point of investigation. Advanced impedance technics, cycling protocols and coupling electrochemical tests with structural and microstructural analytical tools.
- In addition, taking benefits from previous developments, in operando technics such as tomography could be implemented to gain a better understanding of the interplay between electrodes features at mesoscale and transport properties at various C-rates.
- Implementation of innovative technics and cell geometry is also expected in order to probe the in-operando behaviour of such system.
Major part of the work will be done at CEA Liten (Grenoble) with frequent secondments at Solvay facilities in Paris and Bruxelles. Secondments in large scale instruments is envisioned as well as secondment to build theoretical framework to support the analytical work.
The beginning of the thesis is planned on January, 1st 2023 at the latest and for a duration of 3 years.
This topic is part of the European project DESTINY, Doctorate programme on Emerging battery Storage Technologies INspiring Young scientists (https: // www. destiny-phd.eu/), which aims at creating a new paradigm change in battery research. CNRS, acting as the coordinator, with 42 European partner institutions working on future batteries and related issues on energy storage, committed to ambitiously participate in the long-term research initiative Battery 2030+. The project consists in delivering a competitive edge to European industry and academy within the rapidly emerging green technology areas of Electro-mobility and Large-scale energy storage.
Grading institution: Université Grenoble Alpes - FRANCE / Recruiting organisation: CEA LITEN - FRANCE / Hosting: CEA LITEN – FRANCE / Co-funding organisation: SOLVAY – BELGIUM / Secondment foreseen: SOLVAY – BELGIUM / PhD Supervisors: ROUAULT Hélène
Funding category: Contrat doctoral
MSCA COFUND PROJECT
PHD Country: FranceOffer Requirements Specific Requirements
BEFORE SUBMITTING YOUR APPLICATION:
• Please read carefully the Guide for Applicants on the DESTINY website which explains the eligibility requirements and the Application Form N°1 and N°2 with the supporting documents to be provided: https: // www. destiny- phd.eu/cohort-2 • Please upload your Application Form N°1 in PDF in the CV box and your Application Form N°2 in PDF in the cover letter box. • Please disregard the "Application deadline" next to the "apply" button at the top of the advert, the real date is the one indicated on the DESTINY website: https: // www. destiny-phd.eu/cohort-2 • Please do not consider in the salary value indicated for the "Remuneration" & see the Guide for Applicants for more information. • If you apply to the other offer of DESTINY Cohort#2 in the CNRS job portal entitled " PhD Position: New inorganic-polymer composite materials for the positive electrode of asymmetric supercapacitors – DESTINY Marie Sklodowska- Curie Actions COFUND - PhD PROGRAMME ", the Application Forms N°1 & N°2 can be the same (specify the 2 topics chosen in section 3 of the Application Form N°2).Contact Information