Enhanced electrochemistry stability of oxygen doped Li6PS5Cl argyrodite solid electrolyte by liquid-phase synthesis.

The argyrodite solid electrolyte Li 6 PS 5 Cl is one of the promising candidates due to its high Li-ion conductivity for the application of all-solid-state lithium-ion batteries (ASSLIBs). Unfortunately, Li 6 PS 5 Cl argyrodite exhibits low stability against lithium metal anodes and oxide cathodes. One way to improve stability is by oxygen doping into Li 6 PS 5 Cl argyrodite. In this work, Li 6 PS 5 – 2.5x O 2.5x Cl (x = 0, 0.05, and 0.10) solid electrolytes with oxygen doping were successfully synthesized using liquid-phase synthesis for the first time. Therefore, the solid electrolyte with x = 0.05 exhibits high ionic conductivity with enhanced electrochemical stability against lithium metal and oxide cathodes. Argyrodites with x = 0.05 and x = 0.10 show superior capacity retention and higher Coulomb efficiency compared to x = 0. Moreover, the solid electrolytes also demonstrate better stability during Li symmetrical cell measurements. This experiment provides a controllable amount of oxygen doping into the Li 6 PS 5 Cl argyrodite solid electrolyte system in order to achieve high performance of ASSLIBs through liquid-phase synthesis. • The incorporation of P 2 O 5 oxide into sulfide-based Li 6 PS 5 Cl argyrodite solid electrolyte has been explored. • Oxide doping in argyrodite is achieved for the first time through liquid-phase synthesis. • We used Acetonitrile (ACN) and 1-Propanethiol (PTH) in our liquid-phase synthesis for the first time. • Doping oxides into argyrodite enhances battery cycle performance and lithium metal stability. [ABSTRACT FROM AUTHOR]