With limited resources in a continuously growing global Li-ion battery industry, the recyclability of each component is paramount towards establishing a sustainable future. In this study, one promising recyclable solid-state composite electrolyte, lithium magnesium lanthanum strontium zirconium oxide (LLZO-SM, Li6.95Mg0.15La2.75Sr0.25Zr2O12) paired with polypropylene carbonate (PPC, (CH(CH3)CH2OCO2)n) and lithium perchlorate (LiClO4), reprocessed via the cold sintering process (CSP) was investigated. By applying uniaxial pressure and incorporating transient solvents, the CSP allows for the use of lower sintering temperatures, between 25–200°C, and thereby the addition of PPC and LiClO4 to reduce grain boundary resistance. The work below summarizes a viable processing method to recycle LLZO-SM and a method to further increase ionic conductivity during reprocessing.
