期刊
ENERGY TECHNOLOGY
卷 8, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.202000361
关键词
carbon materials; g-C3N4; high-level pyridinic-N; Li-ion batteries; nitrogen doping
资金
- National Natural Science Foundation of China [51777138]
- Natural Science Foundation of Tianjin City [18JCZDJC99700, 18JCYBJC87400, 18JCQNJC73900]
- Science&Technology Development Fund of Tianjin Education Commission for Higher Education [2018KJ130]
Defects engineering is recognized as one promising strategy to enhance the electrochemical performance of carbon materials applied in energy storage field. Different from the commonly used methods, high-level N-doped carbon nanosheets are synthesized in this work via controllable removal of nitrogen atoms from nitrogen-rich graphite carbon nitride (g-C3N4). The nitrogen doping levels and the relative amount of variable nitrogen types, including pyridinic-, pyrrolic-, and graphitic-N, are easily engineered for the obtained carbon nanosheets. Ultrahigh pyridinic-N content as high as 19.1 at% is achieved, closing to the highest values among the reported nitrogen-doped carbon materials. Extraordinary initial discharging capacity of 5190 mAh g(-1)at a current density of 50 mA g(-1)and excellent cycling stability (1639 mAh g(-1)after 200 cycles) as well as promising rate performance (517 mAh g(-1)at 2 A g(-1)) are demonstrated when serving as Li-ion battery anodes. The high nitrogen doping level, especially for the high pyridinic-N doping content in materials, is responsible for these outstanding electrochemical Li-ion storage performances. This work opens a new gateway to develop promising nitrogen-doped carbon materials for the practical application in energy storage devices.
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