Scientific direction Development of key enabling technologies
Transfer of knowledge to industry

PhD : selection by topics

Technological challenges >> Electrochemical energy storage incl. batteries for energy transition
3 proposition(s).

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K-ion batteries, towards a full system without any critical raw materials

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire Matériaux

01-09-2021

SL-DRT-21-0524

david.peralta@cea.fr

Electrochemical energy storage incl. batteries for energy transition (.pdf)

Classic Li-ion batteries are composed of a graphite anode and a cathode containing a lithiated layered oxide (formula LiNixMnyCozO2). The development and the generalization of the electric automobile market will generate stress on certain chemical elements source, especially for lithium, nickel and cobalt. In addition, the production method consumes a lot of energy (multiple calcinations) and several solvents/products used are not respectful of the environment (NMP, ammonia). The thesis aims to develop a battery technology based on potassium. We will pay attention not to use any critical element in order to significantly reduce the ecological footprint. In terms of performance, potassium has a potential close to lithium, which suggests that high-energy batteries can be manufactured. Some potassium cathode materials have theoretical capacities of 155 mAh/g at a potential close to 4 V, which makes the technology competitive with conventional Li-ion batteries. The final target of the PhD thesis is to optimize and validate the technology in a complete system. The student will optimize the synthesis of the cathode material, the anode, the electrolyte in order to obtain an efficient system.

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High Energy Density Positive Electrode based on Glass Materials for Li-Ion and Na-Ion Cells

Département de l'Electricité et de l'Hydrogène pour les Transports (LITEN)

Laboratoire Matériaux

01-10-2021

SL-DRT-21-0577

sebastien.martinet@cea.fr

Electrochemical energy storage incl. batteries for energy transition (.pdf)

This PhD subject will aim at developing new positive electrode materials based on glasses for high Energy Density Li-Ion and Na-Ion cells. These developments will be held jointly between the laboratory of materials for batteries from CEA-Grenoble and LDMC lab from CEA-Marcoule that is specialized in the formulation and characterization of glass materials. The work will be focused on the optimization of the complex formulation of the glass cathodes to solve the issues related to first cycle irreversible loss and low cycling performances. The main objective will be to obtain one composition without critical raw materials exhibiting more than 1000Wh/kg at active material level vs 700 for state-of-the-art materials. This target will be reached with the support of advanced characterization techniques such as X-Ray Diffraction and RAMAN and FTIR spectroscopies. A dedicated effort will concern the development of operando or in-situ measures to be able to explain the link between electrochemical performances and glass characteristics, what has never been reported in the litterature.

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Combinatorial synthesis of thin film materials by magnetron sputtering as a means to identify new solid electrolytes for lithium batteries

DAQUIT (CTReg)

01-10-2021

SL-DRT-21-0880

frederic.lecras@cea.fr

Electrochemical energy storage incl. batteries for energy transition (.pdf)

The aim of the study is to identify new Li+ ionic conductors of interest for all-solid-state battery (ASSB) applications, using experimental high-throughput screening (HTS) of materials compositions. The HTS approach will be based on combinatorial synthesis of thin film materials by magnetron sputtering and an appropriate set of characterizations techniques able to get a mapping of the chemical, structural, electrochemical properties of the materials deposited on a single substrate. Correlations between the different properties will be determined and will be used to identify the best electrolyte materials for the foreseen application. Combinatorial syntheses will be carried out in a brand new multi-target sputtering equipment integrated in a glovebox, so that a large range material chemistries can be envisaged among oxides and sulfides. This equipement located in CEA Tech Aquitaine facilities (Bordeaux) allows to 'mix' elements sputtered simultaneously from different targets and to generate thin film with composition gradients (materials libraries) at the surface of a substrate. Physical, chemical and structural characterization of the thin film materials (XPS, EDX, WDS, Raman, ICP, LIBS, TEM) will be carried out at ICMCB (Institute for Condensed Matter Chemistry of Bordeaux) and at the nano-characterization facilities (PFNC) at CEA Grenoble.Conduction properties will be primarly determined by impedance measurements (EIS). More in-depth characterizations (solid-state NMR (Li7, B11, Si29, P31,..) for ex.) will be possibly carried out for particular compositions.

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