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
2 proposition(s).

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Ecodesign methodology for new generations of batteries

Département des Technologies des NanoMatériaux (LITEN)

Laboratoire des Eco-procédés et EnVironnement

01-10-2020

SL-DRT-20-0535

elise.monnier@cea.fr

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

The development of the electrification of vehicles requires the design of cheaper and more efficient battery technologies. In response to this demand, many development paths are under study, such as new generations of Li-ion with reduced cobalt content or high energy density, all solid state lithium batteries or Li-Sulphur batteries, among other. Apart from the performance aspect, there is a real need to assess the environmental impact of these technologies over their entire life cycle (LCA), and to look at eco-design options for the development of the batteries of the future. The proposed thesis will aim at addressing these issues, using a multidisciplinary approach combining the skills of at least three laboratories from CEA LITEN. At the end of the thesis, the expected results will be: an environmental evaluation of the 3 new generation of battery technologies (advanced Li-Ion, Li-S and All-Solid), compared to reference battery technologies as well as an eco-design methodology to guide decision support in the development of low TRL battery technologies.

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Using complex sulphides as high capacity positive electrode materials for all-solid-state lithium batteries

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

Laboratoire Matériaux

01-10-2020

SL-DRT-20-1065

frederic.lecras@cea.fr

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

In the context of the development of a new generation of lithium batteries with higher energy density and improved safety, this PhD will aim at the comprehensive study of a new family of ?Li-rich' layered intercalation materials Li[LixTi1-x]S2 (LTS) and the assessment of their performance in all-solid-state lithium batteries based on Li2S-P2S5 (LPS) glass-ceramics electrolytes. Preliminary results highlight similarity in the electrochemical behaviour of these compounds with the one of Li2MnO3-LiMO2 (M=Ni, Co,...): a dual anion- and cation-based redox process, accompanied by a more or less progressive activation, and resulting in a high reversible capacity (300 mAh.g-1). The main goals will be (i) to achieve a clear understanding of the phenomena at stake in these materials and their influencing parameters, (ii) to optimize the materials (composition, particle size,?) in order to reach practical performance close to the theoretical ones and (iii) to assess the electrochemical behaviour when embedded in an all-solid-state device (structural evolution of LTS, LTS/LPS interfaces, cohesion of the system). Concerning this last point, note that a better understanding of and a greater control on the stability of the interfaces could be considered as two main keys. To study these buried interfaces from an experimental point of view, this project will rely on a unique world-class analytical platform dedicated to the energy storage field. Indeed, this platform combines the latest technological equipment in electron and ionic spectrometry techniques (XPS, Auger, ToF-SIMS). We will perform a multi-scale analysis of the interfacial properties/morphology of all critical components of all-solid-state batteries and their evolution. Research will be carried out at IPREM (Pau) and ICMCB (CNRS/CEA team, Pessac).

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