期刊
ENERGY STORAGE MATERIALS
卷 22, 期 -, 页码 433-440出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.02.003
关键词
Anthraquinone; N-doped microporous carbon; Organic cathode; Lithium-ion battery
资金
- National Natural Science Foundation of China [11474310, 61605237]
- State Key Program of National Natural Science Foundation of China [61734008]
- External Cooperation Program of BIC, Chinese Academy of Sciences [121E32KYSB20160071]
- Project of Jiangsu Province [BE2016006-3, SYG201629]
- Project of Suzhou City [BE2016006-3, SYG201629]
Anthraquinone (AQ), as organic cathode material, has provided an excellent opportunity to update the preexisting energy storage technologies owing to its facile and desirable fabrication at molecular level, higher theoretical gravimetric capacities and remarkable sustainability. However, some of its pristine properties like insulation and dissolution into electrolyte of organic active materials during cycling, have been inevitable obstacles to boost its electrochemical performance. Herein, we report a rational strategy to improve lithium ion storage performance of AQ by confining nanosized amorphous AQ into zeolitic imidazolate framework-8 (ZIF-8)- derived nitrogen-doped microporous carbon scaffold (AQ@N-ZIF-8). The AQ@N-ZIF-8 cathode delivers a high reversible specific capacity of 240 mAh g(-1) at current rate of 0.1 C and retains similar to 216 mAh g(-1) after 300 cycles (remarkably low capacity fading rate of 0.08% per cycle) with coulombic efficiency up to 99%. The exceptional lithium ion storage capacity of AQ@N-ZIF-8 is mainly ascribed to the synergistic effect of high loading capacity of AQ encapsulation and nanopore confinement of AQ dissolution in carbon scaffolds, and the enhanced conductivity of the encapsulated AQ by higher contents of nitrogen dopant. Moreover, the N-ZIF-8 with micropores facilitates the fast diffusion of organic electrolyte ions.
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