Swiss Science Concentrates

Sulfide-based all-solid-state batteries (ASSBs) with lithium metal anodes (LMAs) are promising due to their safety and potential for higher energy density compared to conventional Li-ion batteries.However, the narrow electrochemical stability window and chemical reactivity of sulfide solid electrolytes with LMAs lead to interfacial degradation and reduced performance.To mitigate this, the authors propose adding prelithiated trithiocyanuric acid (Li 3 TCA) to Li 6 PS 5 Cl, which stabilizes the interface and maintains high ionic conductivity.Incorporating 2.5 wt % Li 3 TCA decreases Li 2 S formation in the solid-electrolyte interface (SEI), enhancing stability.This approach increases the critical current density in Li|Li symmetric cells from 1.0 to 1.9 mA cm -2 and allows stable cycling for over 750 hours.It also extends the lifespan of Li|NbO-NCM811 full cells to over 500 cycles at 0.3 C.