Synthesis and lithium storage property of high-performance N-doped reduced graphene oxide

doi:10.19799/j.cnki.2095-4239.2019.0172

Abstract

Abstract: Graphene is a two-dimensional carbon material with high conductivity, good chemical stability and excellent electrochemical performance, which has promising prospects in energy storage field. Nitrogen doping can not only create structural defects, but also change the electronic distribution for graphene, which is beneficial for the electrochemical energy storage properties. In our work, the nitrogendoped graphene (N-rGO) was prepared using low cost nitrogen source (urea) and graphene oxide solution by freeze-drying and the subsequent high-temperature thermal reduction. The effects of thermal reduction temperature on the chemical composition, structure and electrochemical properties of the N-rGO were also studied. The results show that with the increase of thermal reduction temperature, the nitrogen content decreases, while the graphitization degree and the conductivity increases (72.3 S·cm^-1), indicating the improved lithium storage performance. Tested in half-cell as anode material, the N-rGO-800 exhibits a high reversible capacity of 876 mA·h·g^-1 at 0.05 A·g^-1, superior to the values reported previously. Meanwhile, the specific capacity can retain 584 mA·h·g^-1 at 1 A·g^-1 and remains stable after 850 cycles, indicating excellent cyclic stability and good rate performance.

Key words: nitrogen doped, reduced graphene oxide, anode materials, lithium ion battery

CLC Number:

TM911

SHEN Jinran, GUO Cuijing, CHEN He, ZHOU Shuqin, XU Bin, GUAN Yibiao. Synthesis and lithium storage property of high-performance N-doped reduced graphene oxide[J]. Energy Storage Science and Technology, 2019, 8(6): 1137-1144.

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