N-doped graphene/Bi nanocomposite with excellent electrochemical properties for lithium-ion batteries

作者：Zhang, Yan; Wang, Qian; Wang, Bo; Mei, Yi; Lian, Peichao^*

来源：Ionics, 2017, 23(6): 1407-1415.

DOI：10.1007/s11581-017-1975-3

• Bismuth
• N-doped graphene
• Nanocomposite
• Electrochemical performance
• Lithium-ion batteries

N-doped graphene/Bi nanocomposite was prepared via a two-step method, combining the gas/liquid interface reaction with the rapid heat treatment method. The as-prepared sample was characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), X-ray photoelectron spectroscopy (XPS), and elemental analyzer. The XRD, FESEM, XPS, and elemental analysis results confirm the successful synthesis of N-doped graphene/Bi nanocomposite. As a result, the prepared N-doped graphene/Bi nanocomposite as an anode material for lithium-ion batteries delivers excellent electrochemical performance. A high lithium storage capacity of about 522 mAh g(-1) in the voltage range of 0.01-3.5 V is obtained. After 50 cycles at different current densities from 50 to 1000 mA g(-1), the specific capacity can still remain 386 mAh g(-1). Even at the high current density of 1000 mA g(-1), the N-doped graphene/Bi nanocomposite can still deliver a specific capacity of 218 mAh g(-1). The excellent electrochemical performance of the N-doped graphene/Bi nanocomposite is supposed to benefit from the high electronic conductivity of nitrogen-doped graphene and the synergistic effect of bismuth nanoparticles and nitrogen-doped graphene.

• 出版日期2017-6
• 单位昆明理工大学