Physicochemically dendrite-suppressed three-dimensional fluoridation solid-state electrolyte for high-rate lithium metal battery

Naturally structural and chemical interface instability between solid-state electrolyte (SSE) and Li anode is still a bottleneck for the suppression of Li dendrites to date. Herein, we design the 3D in situ -fluorinated perovskite-type electrolyte hybridized with poly (ethylene oxide) fibers (F-LLTO@PEO) for the synergistically enhanced physicochemical-interface stability. The rapidly Li-ions-transporting and high shear modulus 3D skeleton-structured SSE can physically suppress Li dendrite growth, while the LiF-rich solid-state electrolyte interface (SEI) layer of the in situ fluoridated SSE can chemically eliminate the security risk of Li dendrites. This unique SSE exhibits a high ionic conductivity of 5 × 10 −4 S cm −1 at 25°C. Based on the above, the as-developed solid-state lithium metal batteries (SSLMBs) possess excellent rate-capability of 95 mAh g −1 @ 5 C and cycling stability over 80% after 100 cycles at 90°C. Evidently, this physicochemically dendrite-suppressed strategy will open a previously unexplored opportunity in developing safe, high-performance SSLMBs.