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Al-based metal organic framework derived self-assembled carbon nanosheets as innovative anodes for Li- and Na-ion batteries
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−1 is achieved after 100 cycles at 100 mA g–1, while for Na-ion batteries a specific capacity of 193 mAh g−1 is observed after 100 cycles at 100 mA g–1. Moreover, for Na-ion batteries, even at a high rate of 1000 mA g–1 the material delivers a specific capacity of 109.5 mAh g−1 after 3500 cycles.
Porous carbon nanosheets , Nanostructure , 2D-MOF , Li-ion , Na-ion
Zeng, X.-R., Jin, W.-W., Li, H.-J., Inguva, S., Zhang, Q., Zeng, S.-Z., Xu, G.-Z. and Zou, J.-Z. (2020) 'Al-based metal organic framework derived self-assembled carbon nanosheets as innovative anodes for Li- and Na-ion batteries', Nanotechnology, 31(15), 155602 (11 pp). doi: 10.1088/1361-6528/ab647b
© 2019 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6528/ab647b . As the Version of Record of this article has been published on a subscription basis, this Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period.