Enhancing the Ion Transport Capacity of Composite Polymer Electrolyte via Covalent-Linked Two-Dimensional Layered MBene Nanomaterial for High-Performance Solid-State Lithium Metal Batteries

. Combination of ATR-FTIR spectra, XANES spectra, and DFT calculation reveals the influence of MBene on ion transport. Dendrite-free growth with high reversibility can be maintained for more than 2000 h by lithium plating/stripping in lithium symmetric batteries. The solid electrolyte can be adapted to LFP and LMFP, NCM523 high-voltage cathode materials. It is worth mentioning that the assembled pouch cell also can run stably for 150 cycles at 0.1 C, showing higher cycle capacity. This work not only demonstrates a novel MBene-based composite polymer electrolyte and provides an effective strategy to prevent the aggregation of inorganic fillers in polymer electrolyte but also exhibits excellent application prospects of two-dimensional layered MBene material in solid polymer electrolyte for high-energy density solid-state lithium batteries.