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

https://doi.org/10.1016/j.xcrp.2021.100644Get rights and content
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Highlights

  • A physicochemically dendrite-suppressed strategy for SSEs is developed

  • The high modulus 3D structured SSE could physically suppress Li dendrite formation

  • The LiF-rich SEI from fluoridated SSE could chemically eliminate the Li dendrite

  • This F-LLTO@PEO could be applied for high-rate solid-state lithium metal battery

Summary

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.

Keywords

lithium-metal battery
perovskite-type electrolyte
lithium dendrite
plating and stripping
rate-capability
fluoridation

Data and code availability

All the necessary data supporting the main findings of the paper are available within the main paper and its Supplemental information files and from the Lead Contact upon reasonable request.

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