Novel sandwich structured glass fiber Cloth/Poly(ethylene oxide)-MXene composite electrolyte

Recently, poly(ethylene oxide) (PEO)-based solid polymer electrolytes have been attracting great attention, and efforts are currently underway to develop PEO-based composite electrolytes for next generation high performance all-solid-state lithium metal batteries. In this article, a novel sandwich structured solid-state PEO composite electrolyte is developed for high performance all-solid-state lithium metal batteries. The PEO-based composite electrolyte is fabricated by hot-pressing PEO, LiTFSI and Ti3C2Tx MXene nanosheets into glass fiber cloth (GFC). The as-prepared [email protected] electrolyte shows high mechanical properties, good electrochemical stability, and high lithium-ion migration number, which indicates an obvious synergistic effect from the microscale GFC and the nanoscale MXene. Such as, the [email protected] wt% MXene electrolyte shows a high tensile strength of 43.43 ​MPa and an impressive Young's modulus of 496 ​MPa, which are increased by 1205% and 6048% over those of PEO. Meanwhile, the ionic conductivity of [email protected] wt% MXene at 60 ​°C reaches 5.01 ​× ​10−2 ​S ​m−1, which is increased by around 200% compared with that of [email protected] electrolyte. In addition, the Li/Li symmetric battery based on [email protected] wt% MXene electrolyte shows an excellent cycling stability over 800 ​h (0.3 ​mA ​cm−2, 0.3 ​mAh cm−2), which is obviously longer than that based on PEO and [email protected] electrolytes due to the better compatibility of [email protected] wt% MXene electrolyte with Li anode. Furthermore, the solid-state Li/LiFePO4 battery with [email protected] wt% MXene as electrolyte demonstrates a high capacity of 110.2–166.1 ​mAh g−1 in a wide temperature range of 25–60 ​°C, and an excellent capacity retention rate. The developed sandwich structured [email protected] wt% MXene electrolyte with the excellent overall performance is promising for next generation high performance all-solid-state lithium metal batteries.