Inorganic-organic composite electrolyte is proved an effective way to enhance the overall performance of the electrolytes.However,simply combining powder fillers with polymers is not sufficient for the application of ...Inorganic-organic composite electrolyte is proved an effective way to enhance the overall performance of the electrolytes.However,simply combining powder fillers with polymers is not sufficient for the application of composite electrolytes.In 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)matrix.This 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 ions.The 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 MPa.Besides,it exhibits a reduced overpotential and stable long-term cycling performance over 1700 h when used in Li/Li symmetric batteries.The 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 stability.This work provides a novel idea for designing the next generation of safe and reliable organic-inorganic composite solid-state electrolyte membranes.展开更多
基金National Key R&D Program of China (2021YFB3800300 and 2023YFB2503900)National Natural Science Foundation of China (52072138)technical support from the Analytical and Testing Center of Huazhong University of Science and Technology (HUST)。
文摘Inorganic-organic composite electrolyte is proved an effective way to enhance the overall performance of the electrolytes.However,simply combining powder fillers with polymers is not sufficient for the application of composite electrolytes.In 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)matrix.This 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 ions.The 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 MPa.Besides,it exhibits a reduced overpotential and stable long-term cycling performance over 1700 h when used in Li/Li symmetric batteries.The 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 stability.This work provides a novel idea for designing the next generation of safe and reliable organic-inorganic composite solid-state electrolyte membranes.
