Synergistic Co-Optimization Strategy for Electron-Ion Transport Kinetics in all-Solid-State Sulfurized...

Sulfurized polyacrylonitrile (SPAN) cathodes represent a highly promising category of sulfur-based materials, distinguished by their superior electronic conductivity. Nevertheless, their implementation in all-solid-state lithium-sulfur batteries (ASSLSBs) is hindered by inferior electrochemical performance, primarily arising from the severe exacerbation of inherent electron/ion transport kinetic limitations in conventional micron-sized granular SPAN (GSPAN) microstructures. To circumvent these limitations, a nanofibrous SPAN cathode (FSPAN) is fabricated via electrospinning coupled with programmed pyrolysis. The fabricated 3D-interwoven nanofiber architecture establishes a continuous conductive network, enabling unobstructed transport pathways for efficient charge-carrier migration. This structural design significantly suppresses the interfacial resistance, thereby enhancing the electrode redox kinetics through optimized ion/electron transport dynamics. As a result, the all-solid-state FSPAN cathode demonstrates exceptional electrochemical performance, manifesting a high reversible specific capacity of 1467.2 mAh g^-1 at 0.2 C. Notably, the FSPAN cathode delivers a stable discharge capacity of ≈500 mAh g^-1 at 2 C, marking a fivefold enhancement over conventional GSPAN cathodes. These findings validate a rational materials design paradigm that significantly enhances the performance metrics of all-solid-state SPAN cathodes via spatially synergistic optimization of charge transport pathways.