Synthesis and Properties of Nitrogen-Doped Graphene as Anode Materials for Lithium-Ion Batteries

• Published in: International journal of electrochemical science 2016-05, Vol.11 (5), p.3876-3886
• Main Authors: Fu, Changjing, Song, Chunlai, Liu, Lilai, Xie, Xuedong, Zhao, Weiling
• Format: Article
• Language: English
• Subjects: Anode; Lithium-ion batteries; N-rGO; Synthesis
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)17444-X

Nitrogen-doped graphene (N-rGO) was successfully synthesized during the reduction of graphene oxide by the modified Hummers' method. In contrast to the reduced graphene oxide (rGO), N-rGO presented superior morphology, structure and composition as the anode of lithium-ion batteries (LIBs) according to the examination of SEM, TEM, XRD, Raman spectrum and XPS. The doping content of nitrogen in N-rGO was about 7.98 at.%. The electrochemical performances of N-rGO as anodes of LIBs were also evaluated accordingly. Thus-prepared N-rGO showed a higher reversible specific capacity of 332 mAh g-1 during 600 cycles at 500 mA·g-1. Even at 4 A·g-1, a reversible capacity of 208 mAh·g-1 can still be maintained. The improved electrochemical performance of N-rGO as anodes of LIBs could be due to the specific characteristics of the unique nanostructures, the covalent interactions between N and graphene, the good conductivity and high surface areas, which reduce the transfer resistance for Li-ion and electron and provide more extra live regions for Li storage.