Self‐assembly synthesis of SnNb <sub>2</sub> O <sub>6</sub> /amino‐functionalized graphene nanocomposite as high‐rate anode materials for sodium‐ion batteries
Min Huang, Jixin Liu, Peng Huang, Hai Hu, Chao Lai
Abstract
Abstract A two‐dimensional (2D) SnNb 2 O 6 /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·g −1 was obtained at 50 mA·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·g −1 at current of 500 mA·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 .