α-Ag2S nanoparticles: low-temperature syntheses, crystallisation pathway, and first operando luminescence measurements for sodium-ion battery applications

In situ analyses provide new insights into the nucleation and growth of α-Ag 2 S, allowing fine tuning of their particle size, while operando luminescence measurements helped to reveal the conversion of α-Ag 2 S to Na(Ag 3 S 2 ) and Ag during SIB cycling.