Al-based metal organic framework derived self-assembled carbon nanosheets as innovative anodes for Li- and Na-ion batteries

• Published in: Nanotechnology Vol. 31; no. 15; p. 155602
• Main Authors: Zeng, Xie-Rong, Jin, Wen-Wu, Li, He-Jun, Inguva, Saikumar, Zhang, Qi, Zeng, Shao-Zhong, Xu, Guo-Zhong, Zou, Ji-Zhao
• Format: Journal Article
• Language: English
• Published: England 10.04.2020
• ISSN: 0957-4484; 1361-6528; 1361-6528
• DOI: 10.1088/1361-6528/ab647b

Functional modification and structural design of carbon electrode materials are considered as a cost-effective method to improve their electrochemical performance. In this study, a solvothermal method is applied to realize self-assembly of the metal-organic framework. After simple carbonization and acid treatment, carbon nanosheets with 2D adjustable defective sub-units are successfully prepared for the first time. It is found that carbonization temperature has a significant effect on the carbon skeleton structure. The optimal nanostructures with large specific surface area and appropriate pore size distribution make self-assembled carbon nanosheets having excellent Li/Na-ion storage properties. In addition, the adjustable carbon skeleton structure can effectively avoid irreversible damage when charge-discharge cycles. For Li-ion batteries, a specific capacity of 825 mAh g is achieved after 100 cycles at 100 mA g , while for Na-ion batteries a specific capacity of 193 mAh g is observed after 100 cycles at 100 mA g . Moreover, for Na-ion batteries, even at a high rate of 1000 mA g the material delivers a specific capacity of 109.5 mAh g after 3500 cycles.