Solid-State Batteries
The solid-state battery research topic focuses on developing advanced battery chemistries and designs based on sulfide, oxide, phosphate, and hybrid solid electrolyte systems. Sulfide-type electrolytesstand for resource-efficient chemistry, low-temperature processing, and have a high ionic conductivity. All-ceramic oxide- and phosphate-type batteries can be manufactured bycareful high temperature processing. This allows for superior interfacial designs leading to stable cycling conditions. Hybrid batteries leverage ceramic-polymer designs for high flexibility and tunable properties, as well as a low cost, easy scalable manufacturing and resource efficient chemistry. The core focus lies in optimizing interfaces, stabilizing electrochemical processes, and advancing scalable manufacturing techniques to achieve reliable, high-performance solid-state batteries.
All-Solid-State Sulfide-Based Batteries
Sulfide-based solid-state batteries utilize materials like LGPS-type (Li₁₀GeP₂S₁₂), LPS-type (Li₃PS₄), and Argyrodite-type (Li₆PS₅Cl) solid electrolytes, which provide excellent ionic conductivity (1-10 mS/cm) and processability. Due to their advantageous mechanical properties they are feasible for cold- or low temperature solid-state battery fabrication 1,2 . However, their limitations lie in the chemical stability and phase stability of the thiophosphate subunit and their reactivity with moisture. Our approachrelies on aknowledge-based materials optimization for enhanced performance at sophisticated synthesis conditions one the one hand 3,4,5 . One the other hand, we approach materials processability bytuning the moisture stability, which is crucial for scalable manufacturing and practical implementation 6.
Further information at HIPSTER.
All-Solid-State Oxide and Phosphate-Based Batteries
Oxide and phosphate-based batteries are characterized by their rigid ceramic electrolytes that enhance the safety of the battery due to their non-flammability, non-toxicity and high temperature stability. The fabrication of these electrolytes and the cathode-electrolyte composites however requires high-temperature ceramic processing techniques to provide intimate contact between the solid-electrolyte and the cathode material. This is often challenged by the chemical and thermodynamical instability at sintering temperature between solid electrolyte and cathode. Thus, controlling the formation of stable interfaces at minimal internal elemental diffusion during sintering process is key to superior performing solid-state batteries. During the past decade, through understanding interfacial formation and induced degradation properties in ceramic solid-state batteries 1,2 we have successfully developed oxide- and phosphate-based solid-state batteries with careful processing routes to form stable interfaces and minimize degradation 3,4,5,6. These innovations include the development of all-phosphate backbones, co-fired cathodes with active loading capacities of ~10-15 mg/cm², and garnet-based lithium-metal batteries with stable electrochemical cycling.
Further information at HIPSTER and LISI-2.
Ceramic-Polymer Hybrid Batteries
Hybride batteries combine the flexibility of polymers with the stability of ceramics. Furthermore polymers offer a resource efficient battery chemistry, low toxicity and are easy to scale - while maintaining tunable properties. Electrode-supported designs enable high areal capacities, while electrolyte supported designs enable flexibility for diverse applications. Limitations include the stability towards Li-metal 1 and the engineering of the ceramic-polymer interface for optimal performance. Our research emphasizes scalable designs for real-world integration. We achieved sophisticated battery designs on the “polymer-based” and “polymer-in-ceramic” type with extended cycle lives 2 and flexibility 3 . These systems aim to bridge performance gaps between solid-state and traditional batteries, ensuring robust electrochemical stability and enhanced safety.
Further information at HIPSTER and LISI-2.
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Last Modified: 09.02.2025