Publication date: 21st July 2025
Composite Solid Electrolytes (CSEs) are emerging as safer and more efficient alternatives to liquid electrolytes, playing a crucial role in the development of lithium- and sodium-based All-Solid-State Batteries (ASSBs). In this context, our research group has focused on enabling the co-processing of ceramics, polymers, and ionic salts at low temperatures through the Cold Sintering Process (CSP). CSP is an innovative technique that reduces the sintering temperature of ceramics by nearly 1000 °C compared to conventional, energy-intensive methods.
This low-temperature strategy not only allows the incorporation of polymeric components—thus combining the mechanical and electrochemical benefits of both ceramics and polymers—but also significantly cuts energy consumption and associated CO₂ emissions. The resulting hybrid electrolytes exhibit enhanced structural and electrochemical properties, making CSP a promising route for next-generation solid-state systems. Furthermore, CSP enables the direct co-sintering of bilayered configurations, such as electrolyte–electrode assemblies, simplifying device architecture.
In this contribution, we will highlight the key parameters that govern the fabrication of competitive CSEs and bilayered structures via CSP, while addressing the critical challenges that must be tackled to enable the widespread implementation of ASSBs.
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