Metal organic framework-derived carbon nanosheets with 2D adjustable defective sub-units for outstanding Li- and Na-ion storage

• Published in: Microporous and mesoporous materials 2020-03, Vol.294, p.109901, Article 109901
• Main Authors: Jin, Wen-wu, Cheng, Bin, Li, He-Jun, Inguva, Saikumar, Zou, Ji-zhao, Zhang, Qi, Zeng, Shao-zhong, Xu, Guo-zhong, Zeng, Xie-rong
• Format: Article
• Language: English
• Subjects: 2D-MOF; Carbon nanosheets; Li-ion; Na-ion; Self-assemble
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2019.109901

The structural design and functional properties of carbon materials are considered to improve electrochemical performance of the electrode materials. In this study, a solvothermal method is applied to realize nanostructure engineering of MOF-derived carbon nanostructures. Carbon nanosheets with 2D adjustable defective sub-units are designed for the first time. The optimal nanostructures with large specific surface area and appropriate pore size distribution can effectively avoid irreversible damage when charge-discharge cycles. Therefore, a remarkable electrochemical performance is obtained for both Li-ion and Na-ion battery systems. For Li-ion batteries, a specific capacity of 825 mAh g−1 is achieved after 100 cycles at 0.1 C, while for Na-ion batteries a specific capacity of 193 mAh g−1 is observed after 100 cycles at 0.5 C. Moreover, for Na-ion batteries, even at a high rate of 5 C, the material delivers a specific capacity of 109.5 mAh g−1 after 3500 cycles. [Display omitted] •Carbon nanosheets with 2D adjustable sub-units were designed for the first time.•Self-assembled MOF was used as precursor in the field of SIBs for the first time.•Template-free self-assembly MOF was prepared into superstructure.•Physical-chemical properties of the carbon nanosheets can be tailored.