磷掺杂葵花盘基活性炭在锂离子电池负极材料中的应用

作者：Xing Xianjun; Liu Jianhua; Wang Wenquan; Chen Zeyu; Fu Yixuan

来源：Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering, 2019, 19(2): 434-439.

DOI：10.12034/j.issn.1009-606X.218220

• Activated carbon
• Li-ion batteries
• Negative electrode material
• P-doped
• Sunflower disk

Lithium ion batteries (LIBs) have progressively attracted researchers in recent years because of their environmental friendliness and adequate resources. In order to take full advantages of the active carbon in nature, the cheapest and most efficient negative electrode material for lithium ion battery is in great need. Because sunflower was fully-infected compositae, the sunflower disk had a more stable nanostructure than other biochars. Moreover, the sunflower dish is not only rich in nitrogen and oxygen element, but also widely distributed in the world. In this work, P-doped activation carbon composites were prepared to achieve excellent electrochemical performance in rechargeable LIBs. Phosphorus-injected biomass activated carbon was prepared with simple hydrothermal and calcine methods. The characteristics of activated carbon were then tested with field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), Raman spectrometer, Brunauer Emmett Teller (BET), etc. When these products were applied in lithium ion battery anode materials, the electrodes achieved high energy density and Coulombic efficiency, and cycling stability simultaneously. When the battery cycling at the current density of 500 mA/g, the elementary charge capacity reached to 1052 mAh/g, with the Coulombic efficiency of 48.9%. After 200 cycles, the capacity still maintained1000 mAh/g or more. However, activated carbon capacity of the contrast sample without phosphoric acid activation can only be maintained at 300 mAh/g, which was similar to ordinary carbon materials. Hence, the preparation method of the P-doped biomass resulting in activated carbon was simpleness, and the raw material was low cost and environmentally friendly. Most importantly, the electrode potential of the material was low, and the discharge platform remained stable, which was of great research value in the lithium ion battery in a commercial application. ? 2019, Science Press. All right reserved.

• 单位
  合肥工业大学