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•Energie et climat
•6 min

Observer des batteries tout solides en train de se déformer

Des chercheurs de l’Institut Paul Scherrer PSI ont observé avec une précision inégalée à ce jour des processus mécaniques qui se passent dans les batteries tout solides. Le recours à la tomographie aux rayons X à la Source de Lumière Suisse SLS leur a permis de découvrir le mode de propagation des fissures à l’intérieur des batteries. Leurs conclusions pourraient permettre d’améliorer la sécurité et la performance des batteries des voitures électriques et des smartphones.
•Energy and Climate

Operando X-ray photoelectron spectroscopy, to monitor the chemical and electronic interface evolution in all-solid-state batteries

Degradation of the solid-electrolyte interface occurring during cycling is currently one of the most challenging issues for the development of all-solid-state batteries. Here we designed a unique electrochemical custom made cell for operando X-ray photoelectron spectroscopy (XPS) capable of maintaining high mechanical pressure with reliable electrochemistry and able to monitor in real-time the surface (electro-)chemical reactivity at the interfaces between the different composite.

 
•Energy and Climate

High performance doped Li-rich Li1+xMn2-xO4 cathodes nanoparticles synthesized by facile, fast and efficient microwave-assisted hydrothermal route

Li-rich nanoparticles of Li1+xMn2-xO4 doped with Al, Co or Ni are successfully synthesized using a facile, fast and efficient microwave-assisted hydrothermal route. In this study, we demonstrate that nanocrystallinity and cationic doping play an important role in improving the electrochemical performance with respect to LiMn2O4 microparticles.
•Energy and Climate

Excellent cycling stability of graphite in all-solid-state battery using sulfide solid electrolyte

All-solid-state lithium ion batteries represent a promising battery technology for boosting the volumetric energy density and promising a superior safety. In this study excellent cycling stability of graphite anode material have been demonstrated in combination with sulfide-based solid electrolyte. Furthermore we evaluated the stability of the graphite-electrolyte interface by analyzing the normalized cumulative irreversible charge during cycling experiments.

 
•Energy and Climate

Post mortem/operando XPEEM: for studying the surface of single particle in Li-ion battery electrodes

X-ray photoemission electron microscopy (XPEEM) with its excellent spatial resolution is a well-suited technique to elucidate the complex electrode-electrolyte interface reactions in Li-ion batteries. It provides element-specific contrast images and enables the acquisition of local X-ray absorption spectra on single particles. Here we demonstrate the strength of post mortem measurements and we show the first electrochemical cell dedicated for operando experiments in all-solid-state batteries.