Acta Chim. Sinica ›› 2018, Vol. 76 ›› Issue (3): 209-214.DOI: 10.6023/A17090425 Previous Articles     Next Articles



李志伟a, 仲佳亮a, 陈楠楠a, 薛兵b, 米红宇a   

  1. a 新疆大学 新疆维吾尔自治区洁净煤转化与化工过程重点实验室 乌鲁木齐 830046;
    b 吉林大学材料科学与工程学院 长春 130025
  • 投稿日期:2017-09-18 发布日期:2018-01-22
  • 通讯作者: 米红宇
  • 基金资助:


Template-Assisted Preparation and Lithium Storage Performance of Nitrogen Doped Porous Carbon Sheets

Li Zhiweia, Zhong Jialianga, Chen Nannana, Xue Bingb, Mi Hongyua   

  1. a Xinjiang Uygur Autonomous Region Key Laboratory of Clean Coal Conversion and Chemical Process, Xinjiang University, Urumqi 830046;
    b Department of Materials Science and Engineering, Jilin University, Changchun 130025
  • Received:2017-09-18 Published:2018-01-22
  • Contact: 10.6023/A17090425
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No. 21563029) and the Natural Science Foundation of Xinjiang Uygur Autonomous Region (No. 2014211A015).

Nitrogen doped porous carbon sheets (NPCSs) having high lithium storage performance were successfully prepared by a template-assisted approach using magnesium oxide/melamine/polyethylene glycol (MgO/melamine/PEG) as raw materials. In a typical procedure, the precursor, which consisted of MgO, melamine and PEG in a mass ratio of 7:3:10, was carbonized at 700℃ for 3 h in a temperature-programmed tubular furnace under N2 flow with a heating rate of 5℃·min-1. The intermediate was immersed into 3 mol·L-1 HCl solution for several times to remove MgO. Subsequently, the sample was rinsed with water and ethanol until a neutral pH was obtained, and then dried at 80℃ in a vacuum oven. The sample was systematically characterized and analyzed by Fourier transform infrared spectrometer (FTIR), X-ray powder diffractometer (XRD), X-ray photoelectron spectrometer (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results indicated that NPCSs showed an interconnected porous carbon sheet networks, showing relatively high specific surface area (370.8 m2·g-1), hierarchical pore channels, and high nitrogen content (8.5 at%). Such a continuous porous structure could enhance the electron transport on three-dimensional direction, shorten the diffusion distance of lithium ions, enlarge the interface area between lithium ion and electrolyte, and provide the place for the accommodation of lithium ions. Additionally, high N-doping level in NPCSs could provide numerous activated sites for the intercalation and deintercalation of lithium ions, and enhance the electronic conductivity. Based on the unique structure, NPCSs electrode could exhibit high initial reversible specific capacities (after excluding the contribution of acetylene black, 914 mAh·g-1 at 100 mA·g-1) and good cycling stability (still remaining a specific capacity of 523 mAh·g-1 at 1000 mA·g-1 up to 300 cycles). Moreover, NPCSs displayed high rate capability with a reversible capacity of 355 mAh·g-1 at a current density of 3000 mA·g-1. Therefore, the NPCSs obtained are expectable to be widely used as anode material in lithium-ion batteries.

Key words: porous carbon sheet, carbonization-etching method, anode, Lithium-ion battery