In situ construction of N-doped Ti3C2T x confined worm-like Fe2O3 nanoparticles by Fe–O–Ti bonding for LIBs anode with superior cycle performance

Abstract

The development of Fe2O3 as lithium-ion batteries (LIBs) anode is greatly restricted by its poor electronic conductivity and structural stability. To solve these issues, this work presents in situ construction of three-dimensional crumpled Fe2O3@N-Ti3C2T x composite by solvothermal-freeze-drying process, in which wormlike Fe2O3 nanoparticles (10–50 nm) in situ nucleated and grew on the surface of N-doped Ti3C2T x nanosheets with Fe–O–Ti bonding. As a conductive matrix, N-doping endows Ti3C2T x with more active sites and higher electron transfer efficiency. Meanwhile, Fe–O–Ti bonding enhances the stability of the Fe2O3/N-Ti3C2T x interface and also acts as a pathway for electron transmission. With a large specific surface area (114.72 m2 g−1), the three-dimensional crumpled structure of Fe2O3@N-Ti3C2T x facilitates the charge diffusion kinetics and enables easier exposure of the active sites. Consequently, Fe2O3@N-Ti3C2T x composite exhibits outstanding electrochemical performance as anode for LIBs, a reversible capacity of 870.2 mAh g−1 after 500 cycles at 0.5 A g−1, 1129 mAh g−1 after 280 cycles at 0.2 A g−1 and 777.6 mAh g−1 after 330 cycles at 1 A g−1.