期刊
CHEMSUSCHEM
卷 14, 期 16, 页码 3283-3292出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100837
关键词
batteries; electrochemistry; hybrid materials; lithium storage; organic electrode
资金
- Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-09-E00021]
- National Natural Science Foundation of China [52073170]
- Innovative research team of high-level local universities in Shanghai
- Shanghai Engineering Research Center of Intelligent Computing System [19DZ2252600]
A novel hybrid material, Co-MOP@COF, was designed and exhibited excellent electrochemical performance as an anode for Li-ion batteries, with a large reversible capacity and high cycling stability. The coexisting framework structure provided more surface area for rapid Li-ion diffusion, better electrolyte infiltration, and effective activation of functional groups, leading to enhanced Li storage mechanism involving multi-electron redox reactions.
Due to the adjustable structure and the broad application prospects in energy and other fields, the exploration of porous organic materials [metal-organic polymers (MOPs), covalent organic frameworks (COFs), etc.] has attracted extensive attention. In this work, an imine-induced metal-organic and covalent organic coexisting framework (Co-MOP@COF) hybrid was designed based on the combination between the amino units from the organic ligands of Co-MOP and the aldehyde groups from COF. The obtained Co-MOP@COF hybrid with layer-decorated microsphere morphology exhibited good electrochemical cycling performance (a large reversible capacity of 1020 mAh g(-1) after 150 cycles at 100 mA g(-1) and a reversible capacity of 396 mAh g(-1) at 500 mA g(-1)) as the anode for Li-ion batteries. The coexisting framework structure endowed the Co-MOP@COF hybrid with more surface area exposed in the exfoliated COF structure, which provided rapid Li-ion diffusion, better electrolyte infiltration, and effective activation of functional groups. Therefore, the Co-MOP@COF hybrid material achieved an enhanced Li storage mechanism involving multi-electron redox reactions, related to the Co-II center and organic groups (C=C groups of benzene rings and C=N groups), and furthermore improved electrochemical performance.
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