Sn-doped thioantimonate superionic conductors with high air stability and enhanced Li-ion conduction for all-solid-state lithium batteries

Abstract

The sulfide-based solid electrolyte (SSE) has been considered as a strong candidate for potential uses in the all-solid-state lithium batteries (ASSLBs). Nevertheless, most of reported SSEs are plagued with their...

Li4.1P0.9Sn0.1S4I Solid Electrolyte with Favorable Air Stability for All-Solid-State Lithium Batteries

“…For Li 4 PS 4 I and Li 4.1 P 0.9 Sn 0.1 S 4 I solid electrolytes, the extra peaks assigned to LiI·H 2 O are detected, which serves as a barrier for preventing the reaction between PS 4 3– groups and H 2 O. , Therefore, the H 2 S amount released from Li 4 PS 4 I and Li 4.1 P 0.9 Sn 0.1 S 4 I solid electrolytes was significantly suppressed and remained constant after the formation of an effective barrier. Furthermore, the presence of air-stable SnS 4 4– groups makes the Li 4.1 P 0.9 Sn 0.1 S 4 I solid electrolyte more moisture-resistant than the Li 4 PS 4 I solid electrolyte, thus generating a less amount of H 2 S gas. − The ionic conductivities of the above-mentioned solid electrolytes after being exposed to air with 35% relative humidity for 20 min were also measured, as shown in Figures c and S3. The total resistance of the air-exposed Li 3 PS 4 solid electrolyte is 3.3 kΩ, while the resistances for Li 4 PS 4 I and Li 4.1 P 0.9 Sn 0.1 S 4 I solid electrolytes are 1.3 and 1.1 kΩ, respectively, corresponding to the ionic conductivities of 3.8 × 10 –5 , 9.8 × 10 –5 , and 1.2 × 10 –4 S cm –1 , respectively.…”