摘要：Inorganic-organic composite electrolyte is proved an effective way to enhance the overall performance of the ***,simply combining powder fillers with polymers is not sufficient for the application of composite *** this work,we designed an ultrathin organic-inorganic composite solid electrolyte with high mechanical strength and ionic conductivity,in which the inorganic Li1.5Al0.5Ge1.5(PO_(4))3(LAGP)solid electrolyte is prefiberized into a three-dimensional nanofiber network to serve as a self-supporting skeleton for the polyethylene oxide(PEO)*** continuous skeleton structure not only significantly improves the mechanical strength of the PEO-based electrolyte,but also forms a continuous lithium-ion conduction path,promoting the rapid migration of lithium *** fiber-reinforced composite electrolyte has an ionic conductivity of 8.27×10^(−4) S cm^(-1) at 60°C and a tensile strength of up to 4.29 ***,it exhibits a reduced overpotential and stable long-term cycling performance over 1700 h when used in Li/Li symmetric *** LiFePO_(4)(LFP)|Li cell assembled with the fiber-reinforced composite electrolyte also delivers a specific capacity of about 142 mAh g^(−1) over 300 cycles at 0.5 C and maintains good cycling *** work provides a novel idea for designing the next generation of safe and reliable organic-inorganic composite solid-state electrolyte membranes.