Surface protection and interfacial optimization by ALD-coatings on sulfide-based solid electrolytes (SE) - ALD-SE

Project summary

Solid-state batteries using sulfide-based solid electrolytes are compatible with conventional lithium-ion technology, but State-of-the-Art sulfides do not meet the current requirements for chemical and electrochemical stability. This project will investigate a novel surface engineering technology for solid electrolytes to overcome these limitations. By applying coatings, using atomic layer deposition (ALD) to the surfaces of the sulfide particles, we will enable protection against moisture, polar solvents, and suppress reactions at anodic or cathodic potentials. The project will develop novel coatings by ALD. Solid-state NMR will be used aiming to understand the structural effects of the coatings and effects the coatings will have to the sulfide interface. Solid-state battery technology will benefit from the proposed approach by simplified material processing (solvent, moisture compatibility), increased safety (suppression of H2S-formation) and increased cycle life (less degradation).