β-CD And Succinonitrile Reinforced Polymer Electrolytes for all-Solid-State Lithium Metal Batteries

With the advancement of the global dual-carbon goal, green technology has become a priority in the energy field. Among energy storage technologies, all-solid-state batteries attract significant attention due to their high energy density, enhanced safety, and long cycle life. Poly(ethylene oxide) (PEO)-based polymer solid-state electrolytes are a research hotspot for next-generation lithium-metal batteries because of their flexibility, film-forming capabilities, and compatibility with lithium salts. In this study, cyclodextrin (beta-CD) is employed as a green filler and combined with high-modulus polyacrylonitrile (PAN) fibers and plastic crystalline succinonitrile (SN) to synergistically enhance the electrochemical and mechanical properties of PEO-based electrolytes. The PAN/PEO/LiClO4/beta-CD/SN electrolyte achieves an ionic conductivity of 6.5 x 10-5 S cm-1 at 30 degrees C and a lithium ion transference number of 0.33 at 80 degrees C. PAN fiber significantly improves mechanical properties, achieving a tensile strength exceeding eight times that of the PEO/LiClO4 membrane. In Li/Li symmetric batteries, the electrolyte demonstrates excellent interfacial stability for over 1100 h at 0.1 mA cm-2. Additionally, the LiFePO4|PAN/PEO/LiClO4/beta-CD/SN|Li coin cell exhibits an initial discharge specific capacity of 148 mAh g-1 at 80 degrees C and 0.5C, retaining 70% capacity after 200 cycles. This study presents a novel design approach for utilizing green fillers in SPEs.