The review, published in Nature Energy, focuses on potential recycling strategies and process chains for various solid-state batteries (SSBs), focusing on promising solid electrolytes (SEs), including oxides, sulfides/thiophosphates/halides and polymers, and combinations thereof. Due to the different physical and chemical properties of the mentioned SEs, we consider adapted recycling process routes consisting of pretreatment as well as mechanical, hydro- and pyrometallurgical processes. With this in mind, we believe that a multi-way, multi-product recycling plant that can recycle as many different cell chemistries and SSB types as possible (including other next generation batteries such as lithium-sulfur or sodium ion batteries) would be very beneficial. We also encourage the further development of direct regeneration processes for cathode active materials (CAMs) and SEs to achieve higher recycling rates and minimize negative environmental impacts.
