Composite Batteries Consisted of Three Dimensional Structured Li1.5Al0.5Ge1.5(PO4)3 and Ionic Liquid

In all-solid-state batteries, the rigid point contact between the solid electrolyte and electrode results in poor cell interface wettability and generates large interfacial impedance, which hinders the application of solid-state batteries. To enhance ionic conductivity and interfacial wettability of NASICON-structured solid-state electrolyte Li1.5Al0.5Ge1.5(PO4)3 (LAGP), microporous LAGP with a hexagonal surface pattern is prepared using femtosecond laser followed by filling an ionic liquid electrolyte to form a solid-liquid composite electrolyte (HPL&IL). The effect of surface textures on the electrolyte-electrode interface is investigated. Experimental results demonstrate that cycling stability for Li|HPL&IL|Li cells can reach up to 350 hours at a constant current density of 0.05 mA cm-2 at room temperature, and hexagonal surface textures promote uniform interfacial film formation while increasing contact area between electrode and electrolyte, providing more space for charge transfer at the interface.