Self-assembly synthesis of SnNb2O6/amino-functionalized graphene nanocomposite as high-rate anode materials for sodium-ion batteries

• 作者: Min Huang Ji-Xin Liu Peng Huang Hai Hu Chao Lai
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 425-432
• 页数: 8页
• 语种: 英文

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 SnNb2O6 nanosheets are evenly anchored with the aminofunctionalized graphene through electrostatic attractive interplay between the negatively charged SnNb2O6 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.