Self-assembly synthesis of SnNb2O6/amino-functionalized graphene nanocomposite as high-rate anode materials for sodium-ion batteries
来源期刊：Rare Metals2021年第2期
论文作者：Min Huang Ji-Xin Liu Peng Huang Hai Hu Chao Lai
文章页码：425 - 432
摘 要：A two-dimensional（2 D） SnNb2 O6/amino-functionalized graphene（En-RGO） nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries.The SnNb2 O6 nanosheets are evenly anchored with the aminofunctionalized graphene through electrostatic attractive interplay between the negatively charged SnNb2 O6 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 to1900 cycles with a high reversible capacity of200 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% at1.2 mV·s-1.
Min Huang1,2，Ji-Xin Liu3，Peng Huang1,2，Hai Hu2，Chao Lai2
1. Postdoctoral Innovation Practice Base,Zhengzhou Normal University2. School of Chemistry and Material Science,Jiangsu Normal University3. Superconducting Materials Research Center,Northwest Institute for Nonferrous Metal Research
摘 要：A two-dimensional（2 D） SnNb2 O6/amino-functionalized graphene（En-RGO） nanocomposite with a representative 2 D-2 D architecture has been constructed by an easy self-assembly approach and firstly investigated as anode materials for secondary sodium-ion batteries.The SnNb2 O6 nanosheets are evenly anchored with the aminofunctionalized graphene through electrostatic attractive interplay between the negatively charged SnNb2 O6 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 to1900 cycles with a high reversible capacity of200 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% at1.2 mV·s-1.
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