| Abstract:In this study, regenerated cellulose separators were prepared from Tencel cellulose using a NaOH/urea/thiourea aqueous solution system combined with a non-solvent-induced phase separation method. The effects of PFI beating treatment, residual undissolved fiber skeletons retained during partial dissolution, and exogenously introduced bacterial cellulose (BC) nanofiber skeletons after complete dissolution on the structure and properties of the membranes were systematically investigated. The results demonstrated that PFI beating pretreatment and partial dissolution membrane fabrication significantly improved the mechanical properties of cellulose membranes, with the maximum tensile strength reaching 62.5 MPa, which was substantially higher than that of the unbeaten membrane. After introducing 2% BC into the completely dissolved cellulose solution, the tensile strength of the regenerated cellulose composite membrane (RC/BC composite membrane) was further increased to 75.2 MPa. The RC/BC composite membrane exhibited an average pore size of 89.2 nm in the hydrated state and an ionic conductivity of 1.02 mS cm-1, demonstrating promising potential as a separator material for lithium-ion batteries. |