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Department Interface Design

Soft and hard XAS combined with (HAX)PES in (ultra) high vacuum environment for all-solid-state batteries

Probing anode-free batteries by operando HAXPES

• To create anode-free setup, a 6nm thin film of a Ni current collector is deposited on top of the solid electrolyte that is pressed from the other side to the Li counter electrode using a specially-designed operando cell. An array of holes in the top plate allow for direct access of the beam to the electrode whilst providing a homogenous current distribution.
 
•The ultrathin current collector approach allows for probing electroreduction, electrooxidation and metal plating reaction on large variety of electrolytes and experiment conditions.
 
•Li6PS5Cl starts to decompose already at 1.75 V, with increasing of Li density and formation of mainly Li2S and Li2O. These side products decompose in the 2–4 V window, generating  sulfur species, sulfites and sulfates.
1 Solid Batteries - enlarged view
2 Solid Batteries - enlarged view

For more details see:

Burak Aktekin, Elmar Kataev, Luise M. Riegger, Raul Garcia-Diez, Zora Chalkley, Juri Becker, Regan G. Wilks, Anja Henss, Marcus Bär, Jürgen Janek, Operando Photoelectron Spectroscopy Analysis of Li6PS5Cl Electrochemical Decomposition Reactions in Solid-State Batteries, ACS Energy Lett. 2024, 9, 7, 3492–3500 (2024)