《Unraveling the crystallinity on battery performances of chlorine-rich argyrodite electrolytes》

The electrolyte Li5.5PS4.5Cl1.5 of chlorine-rich sulphur silver germanium ore has great application prospects in solid-state batteries (SSB) due to its high ionic conductivity and relatively low cost. However, the effect of crystallinity of Li5.5PS4.5Cl1.5 on the electrochemical performance of related solid-state batteries is unclear. In this paper, the effects of LiNi0.8Mn0.1Co0.1O2/SE/Li-In solid-state batteries using different crystallinity Li5.5PS4.5Cl1.5 (c- and gc-LPSC) electrolytes on the electrochemical performance of the battery were studied in detail. The test results show that SSBs using c-LPSC electrolyte have higher capacity and better rate performance than gc-LPSC electrolyte at different operating temperatures, because the former has higher lithium-ion conductivity. Moreover, the optimized solid-state battery has a specific capacity of 120.2 mAh g-1 for the first discharge at 5C magnification, and the capacity retention rate is 64% after 3500 cycles at room temperature. At higher temperatures (60°C), the discharge specific capacity can reach 145.5 mAh g-1, and the capacity retention rate is 80.8% after 500 cycles. This work reveals the effect of the crystallinity of the electrolyte of chlorine-rich sulphur-rich silver germanium ore on its intrinsic properties, which provides guidance for the construction of high-performance solid-state batteries.

https://www.sciencedirect.com/science/article/pii/S0378775321013744