期刊
SMALL
卷 14, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703969
关键词
3D graphene frameworks; high-performance anodes; lithium-ion batteries; N-doped; ultrathin carbon layers
类别
资金
- National Natural Science Foundation of China [51673042]
- China Postdoctoral Science Foundation [2016M601490]
- Deanship of Scientific Research at King Saud University [RGP-VPP-312]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2015002]
The designable structure with 3D structure, ultrathin 2D nanosheets, and heteroatom doping are considered as highly promising routes to improve the electrochemical performance of carbon materials as anodes for lithium-ion batteries. However, it remains a significant challenge to efficiently integrate 3D interconnected porous frameworks with 2D tunable heteroatom-doped ultrathin carbon layers to further boost the performance. Herein, a novel nanostructure consisting of a uniform ultrathin N-doped carbon layer in situ coated on a 3D graphene framework (NC@GF) through solvothermal self-assembly/polymerization and pyrolysis is reported. The NC@GF with the nanosheets thickness of 4.0 nm and N content of 4.13 at% exhibits an ultrahigh reversible capacity of 2018 mA h g(-1) at 0.5 Ag-1 and an ultrafast charge-discharge feature with a remarkable capacity of 340 mA h g(-1) at an ultrahigh current density of 40 Ag-1 and a superlong cycle life with a capacity retention of 93% after 10 000 cycles at 40 Ag-1. More importantly, when coupled with LiFePO4 cathode, the fabricated lithium-ion full cells also exhibit high capacity and excellent rate and cycling performances, highlighting the practicability of this NC@GF.
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