【摘 要】
：
We report a three-dimensional (3D) nanofiber-reinforced solid composite electrolyte with a 3D Li+-conducting ceramic network of Li6.25Ga0.25La3Zr2O12 (LLZO) nan
【机 构】
：
State Key Laboratory of Material Processing and Die & Mould Technology, Laboratory of Solid State Io
论文部分内容阅读
We report a three-dimensional (3D) nanofiber-reinforced solid composite electrolyte with a 3D Li+-conducting ceramic network of Li6.25Ga0.25La3Zr2O12 (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 LiFePO4 cathode deliver a superior capacity (158.0 mA h g-1) and significant capacity retention (90.4％ retention after 800 cycles) at 60 C.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.
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