期刊
ACS NANO
卷 12, 期 4, 页码 3947-3953出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b01488
关键词
metal-organic frameworks; pulverization; ultrasmall nanocrystals; electrochemical energy storage; lithium-ion battery
类别
资金
- National Natural Science Foundation of China [51673042]
- Young Elite Scientist Sponsorship Program by CAST [2017QNRC001]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2015002]
- China Postdoctoral Science Foundation [2017M611445]
- Deanship of Scientific Research at King Saud University [RGP-VPP-312]
Synthesis of ultrasmall metal organic framework (MOF) nanoparticles has been widely recognized as a promising route to greatly enhance their properties but remains a considerable challenge. Herein, we report one facile and effective spatially confined thermal pulverization strategy to successfully transform bulk Co-MOF particles into sub-5 nm nanocrystals encapsulated within N-doped carbon/graphene (NC/G) by using conducting polymer coated Co-MOFs/graphene oxide as precursors. This strategy involves a feasible mechanism: calcination of Co-MOFs at proper temperature in air induces the partial thermal collapse/distortion of the framework, while the uniform coating of a conducting polymer can significantly improve the decomposition temperature and maintain the component stability of Co-MOFs, thus leading to the pulverization of bulk Co-MOF particles into ultrasmall nanocrystals without oxidation. The pulverization of Co-MOFs significantly increases the contact area between Co-MOFs with electrolyte and shortens the electron and ion transport pathway. Therefore, the sub-5 nm ultrasmall MOF nanocrystals-based composites deliver an ultrahigh reversible capacity (1301 mAh g(-1) at 0.1 A g(-1)), extraordinary rate performance (494 mAh g(-1) at 40 A g(-1)), and outstanding cycling stability (98.6% capacity retention at 10 A g(-1) after 2000 cycles), which is the best performance achieved in all reported MOF-based anodes for lithium-ion batteries.
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