construction of N-doped TiCTconfined worm-like FeOnanoparticles by Fe-O-Ti bonding for LIBs anode with superior cycle performance.

The development of FeOas lithium-ion batteries (LIBs) anode is greatly restricted by its poor electronic conductivity and structural stability. To solve these issues, this work presentsconstruction of three-dimensional crumpled FeO@N-TiCTcomposite by solvothermal-freeze-drying process, in which wormlike FeOnanoparticles (10-50 nm)nucleated and grew on the surface of N-doped TiCTnanosheets with Fe-O-Ti bonding. As a conductive matrix, N-doping endows TiCTwith more active sites and higher electron transfer efficiency. Meanwhile, Fe-O-Ti bonding enhances the stability of the FeO/N-TiCTinterface and also acts as a pathway for electron transmission. With a large specific surface area (114.72 mg), the three-dimensional crumpled structure of FeO@N-TiCTfacilitates the charge diffusion kinetics and enables easier exposure of the active sites. Consequently, FeO@N-TiCTcomposite exhibits outstanding electrochemical performance as anode for LIBs, a reversible capacity of 870.2 mAh gafter 500 cycles at 0.5 A g, 1129 mAh gafter 280 cycles at 0.2 A gand 777.6 mAh gafter 330 cycles at 1 A g.