▎ 摘　　要

A two-dimensional (2D) SnNb2O6/amino-functionalized graphene (En-RGO) nanocomposite with a representative 2D-2D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries. The SnNb(2)O(6)nanosheets are evenly anchored with the amino-functionalized graphene through electrostatic attractive interplay between the negatively charged SnNb(2)O(6)and positively charged En-RGO after modification. As a result, a remarkable reversible capacity of 300 mAh center dot g(-1)was obtained at 50 mA center dot g(-1), and significantly, the En-RGO electrode could also deliver ultra-long calendar life up to 1900 cycles with a high reversible capacity of 200 mAh center dot g(-1) at current of 500 mA center dot g(-1). Such excellent electrochemical characteristics can be mainly ascribed to its fast pseudo-capacitive energy storage mechanism, and the capacitive contribution can even reach up to 90% at 1.2 mV.s(-1).