Embedding of Laser-Generated Nano-Garnet in Poly(Ethylene Oxide) Enabling Boosted Li+ Conduction for Solid-State Lithium Metal Batteries

Incorporating of ceramic superionic fillers in Li + conductive polymer matrix is an efficient strategy for developing solid-state electrolyte, while challenges remain on embedding ceramic fillers with well-defined size and well-dispersion that could maximum the interfacial interactions and decrease the crystallization of polymer for improved conductivity. Herein we report an intriguing strategy of liquid-phase laser manufacturing to in-situ generate nano Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (Nano-LLZTO) with the average size of 8.3 nm in the presence of PEG. Even dispersion of Nano-LLZTO in poly(ethylene oxide) (PEO) matrix is realized benefiting from the interfacial comparability between PEO and PEG. Such embedding leads to maximally an order of magnitude enhancement of Li + conductivity by incorporating Nano-LLZTO with the content of 2.0 wt%, compared to that of neat PEO-based electrolyte. Meanwhile, enhanced dendrite-suppression capability and interfacial stability are achieved with stable and low overpotential of ~68 mV and a long lifespan up to 400 h in symmetric cells, and enhanced tensile strength close to 3.0 MPa and the maximum strain of 2200% are simultaneously achieved. Solid-state batteries comprising of electrolyte embedded with Nano-LLZTO demonstrates stable cycling performances over 800 cycles. We thus believe the proposed facile design of embedding nano garnet will provide an efficient alternative for to address the weak Li + conductivity of polymer matrix for high-performance solid-state electrolyte