A Large-Scale Fabrication of Flexible, Ultrathin, and Robust solid Electrolyte for Solid-State Lithium-Sulfur Batteries.

solid-state electrolytes, 3D supporting skeleton, mechanical strength, uniform Li deposition, F-enriched SEIAll-solid-state lithium metal batteries (ASSLMBs) are considered as the most promising candidates for the next-generation high-safety batteries. To achieve high energy density in ASSLMBs, it is essential that the solid-state electrolytes (SSEs) are lightweight, thin, and possess superior electrochemical stability. In this study, we propose a feasible and scalable fabrication approach to construct 3D supporting skeleton using an electro-blown spinning technique. This skeleton not only enhances the mechanical strength, but also hinders the migration of Li-salt anions, improving the lithium-ion transference number of the SSE. This provides a homogeneous distribution of Li-ion flux and local current density, promoting uniform Li deposition. As a result, based on the mechanically robust and thin SSEs, the Li symmetric cells show outstanding Li plating/stripping reversibility. Besides, a stable interface contact between SSE and Li anode has been established with the formation of a F-enriched solid electrolyte interface (SEI) layer. The solid-state Li|sulfurized polyacrylonitrile (Li|SPAN) cell achieves a capacity retention ratio of 94.0% after 350 cycles at 0.5 C. Also, the high-voltage Li|LCO cell shows a capacity retention of 92.4% at 0.5 C after 500 cycles. This fabrication approach for SSEs is applicable for commercially large-scale production and application in high-energy-density and high-safety ASSLMBs. This article is protected by copyright. All rights reserved.