Nitrogen-rich sandwich-like carbon nanosheets as anodes with superior lithium storage properties

作者：Chu, Hailiang; Shao, Chunfeng; Qiu, Shujun^*; Zou, Yongjin; Xiang, Cuili; Xu, Fen; Sun, Lixian^*

来源：Inorganic Chemistry Frontiers, 2018, 5(1): 225-232.

DOI：10.1039/c7qi00567a

• DOPED POROUS CARBON
• HIGH-PERFORMANCE
• MESOPOROUS CARBON
• ION BATTERIES
• ELECTRODE MATERIALS
• GRAPHENE SHEETS
• HYDROTHERMAL CARBONIZATION
• SUPERHIGH CAPACITY
• ENERGY-STORAGE
• NANOTUBES

Carbon materials such as graphite have been used as anode material for Li-ion batteries (LIBs). However, the energy stored in carbon materials is greatly dependent on their structural characteristics. Herein, nitrogen-rich sandwich-like carbon nanosheets (NSCN) have been prepared through a facile hydrothermal carbonization (HTC) method followed by pyrolysis. The nitrogen-rich sandwich-like carbon nanosheets synthesized at 600 degrees C (NSCN-600) have a higher specific surface area of 1112 m(2) g(-1) and a total nitrogen content of 11.4 wt% (therein 9.30 wt% for both pyridinic-N and pyrrolic-N), giving rise to high discharge capacity (910 mA h g(-1) at 100 mA g(-1) after 50 cycles) and remarkable rate capability (719 mA h g(-1) at 500 mA g(-1) after 200 cycles and 390 mA h g-1 at 2000 mA g(-1)). Such desirable electrochemical properties could be attributed to the unique sandwich-like nanostructures consisting of a number of amorphous carbon nanoparticles closely covered with carbon sheet layers. Such a simple preparation method could provide a strategy for rational engineering of nanostructured nitrogen-rich carbonaceous materials for high-performance LIBs.

• 出版日期2018-1
• 单位桂林电子科技大学