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Stabilization of Li-ion cathode materials for high energy applications

Technological challenge: Electrochemical energy storage incl. batteries for energy transition (learn more)

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

Laboratory: Laboratoire Matériaux

Start Date: 01-10-2022

Location: Grenoble

CEA Code: SL-DRT-22-0641

Contact: jean-francois.colin@cea.fr

Currently, the cathode materials used for high energy applications, such as the electric mobility, are the so called Ni-Rich NMCs, LiNixMnyCozO2 avec x+y+z=1 and x>0.5. This composition containing a lot of Ni and Co made them very expensive. Only few alternatives exist, so called Mn-Rich materials being one of the most promising. This class of materials contains two different families. On the one hand, layered Li-Rich materials : LixMnyNizO2 (avec x+y+z=2, x>1 et y>0.5), on the other hand disordered rocksalt among which Li2MnO2F is one of the classical composition. In both cases, these materials exhibit very high specific capacities, over 250mAh.g-1 that makes them attractive despite their low working potential and densities compared to Ni-Rich. Moreover, their composition makes them cheap materials. However their functioning relies on a peculiar oxidation of the oxygen network, that gives rise to a degradation of the performances along cycling. The goal of the thesis will be to develop stabilisation solutions, in particular surface coatings or additives and to deepen the understanding on these degradation mechanisms.

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