共价键
化学工程
阴极
重量分析
共价有机骨架
钠离子电池
电池(电)
材料科学
有机自由基电池
聚合物
化学
钠
傅里叶变换红外光谱
共轭体系
氧化还原
电化学
电极
无机化学
法拉第效率
有机化学
物理化学
功率(物理)
工程类
物理
量子力学
作者
Ruijuan Shi,Luojia Liu,Yong Lü,Chenchen Wang,Yixin Li,Lin Li,Zhenhua Yan,Jun Chen
标识
DOI:10.1038/s41467-019-13739-5
摘要
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 g −1 , excellent cycling stability (~96% capacity retention after 1000 cycles) and high rate performance (134.3 mAh g −1 at 10.0 A g −1 ). Furthermore, a pouch-type battery is assembled, displaying the gravimetric and volumetric energy density of 101.1 Wh kg −1 cell and 78.5 Wh L −1 cell , respectively, indicating potentially practical applications of conjugated polymers in rechargeable batteries.
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