MXene/graphene oxide heterojunction as a high performance anode material for lithium ion batteries

Abstract

MXene/graphene oxide composites with strong interfacial interactions were constructed by ball milling in vacuum. Graphene oxide (GO) acted as a bridge between Ti₃C₂T_x nanosheets in the composite material, which could buffer the mechanical shear force during the ball milling process, avoid the structural damage of nanosheets and improve the structural stability of the composite material during the lithium process. Partial oxidation of Ti₃C₂T_x nanosheets is caused by high temperatures during ball milling, which is beneficial to improve the intercalation of lithium ions in the material, reduce the stress and electrostatic repulsion between adjacent layers, and cause the composite to have better lithium storage performance. Under the high current density of 2.5 A g⁻¹, the reversible capacity of the Ti₃C₂T_x/GO composite material after 2000 cycles was 116.5 mA h g⁻¹, and the capacity retention was as high as 116.6%.