摘要
We report a three-dimensional(3D)nanofiber-reinforced solid composite electrolyte with a 3D Li^(+)-conducting ceramic network of Li_(6.2)5Ga_(0.25)La_(3)Zr_(2)O_(12)(LLZO)nanofibers.Benefiting from the 3D structure,the composite shows a high ionic conductivity of 3.2×10^(-4)S cm^(-1)and Li-ion transference number of 0.32 at room temperature.The interfacial resistance between the composite solid electrolyte and cathode is mitigated by creating an integrated interfacial structure,in which the polyethylene oxide(PEO)-lithiumbis(trifluoromethylsulphonyl)imide(LiTFSI)binder and ionic liquids(ILs)form a viscoelastic interface.Therefore,intimate contact,low interfacial impedance,and fast ion-transport between the cathode and the solid electrolyte are simultaneously achieved.Solid-state lithium metal batteries with the Li Fe PO_(4) cathode deliver a superior capacity(158.0 m A h g^(-1))and significant capacity retention(90.4%retention after 800 cycles)at 60℃.Moreover,the smooth and uniform Li surface after long-term cycling confirms the successful suppression of the dendrite formation.The integrated interfacial structure provides a solution to the interfacial problem and improves the cycling performance in solid-state Li-metal batteries.
基金
supported by the National Natural Science Foundation of China(51672096)
China Postdoctoral Science Foundation funded project(2020M682403)the National Natural Science Foundation of China and the Israeli Science Foundation for funding this research within the framework of the joint NSFC-ISF(51961145302)。
