Nitrogen-rich covalent organic frameworks with multiple carbonyls for high-performance sodium batteries
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Abstract
Abstract Covalent organic frameworks with designable periodic skeletons and ordered nanopores have attracted increasing attention as promising cathode materials for rechargeable batteries. However, the reported cathodes are plagued by limited capacity and unsatisfying rate performance. Here we report a honeycomb-like nitrogen-rich covalent organic framework with multiple carbonyls. The sodium storage ability of pyrazines and carbonyls and the up-to twelve sodium-ion redox chemistry mechanism for each repetitive unit have been demonstrated by in/ex-situ Fourier transform infrared spectra and density functional theory calculations. The insoluble electrode exhibits a remarkably high specific capacity of 452.0 mAh…
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8Topics & keywords
Topics
Keywords
- Covalent bond
- Cathode
- Chemical engineering
- Covalent organic framework
- Gravimetric analysis
- Sodium-ion battery
- Battery (electricity)
- Materials science
UN Sustainable Development Goals
- Affordable and clean energy
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