A little bit of SALT, but not too much: Prevent hyPERtension in all-solid-state batteries – SALT-PPER

All solid-state batteries (ASSB) have the potential to outclass state-of-the-art Li-ion batteries, provided several key challenges are solved. Among them, the interface between the positive electrode material and the solid electrolyte is a source of large interfacial resistance, progressively leading to overpotential and failure of the cell. To tackle this issue, the SALT&PPER project will develop coatings based on simple Li salts selected to create a passivating interphase layer with minimal interfacial resistance. The composition of the coating salt and its thickness will be crucial in optimizing ionic conductivity, processing temperature and electrochemical stability of the system, all aspects that will be carefully studied using complementary ex situ and operando techniques (XRD, XAS, XPS, microscopy). New functionalities of the coating will also be explored to extend the cycle life of ASSBs, which will be evaluated by assembling complete systems for electrochemical characterization.