高性能碳纳米管复合Fe3O4锂离子电池负极材料研究

通过添加碳纳米管共沉淀的方法制备了Fe3O4-CNTs复合材料。研究发现,CNTs不仅可以降低复合材料作为锂离子电池负极的阻抗,而且对活性物质Fe3O4起到很好的支撑作用,极大地提高了Fe3O4在充放电过程中的电化学稳定性。在0.5 A/g的电流密度下Fe3O4-CNTs循环200圈后的放电比容量保持在1406 mAh/g。在10 A/g的大电流密度下循环,第100圈时Fe3O4-CNTs的放电比容量稳定在230 mAh/g左右。循环至第9999圈时,Fe3O4-CNTs的比容量下降至179 mAh/g,只损失了50 mAh/g,充放电效率高达99.98%。Fe3O4-CNTs复合材料在大电流密度超长循环的背景下表现出优异的性能,对负极材料的开发有重要的意义。

Research on high performance Fe3O4 carbon nanotubes composite lithium ion battery anode materials

Fe3O4-CNTs composites were prepared by co-precipitation method. The results indicate that CNTs not only reduce the impedance of the composite material, but also play a good supporting role in the active material of Fe3O4, leading to significant improvement of the electrochemical stability during the charge and discharge process. The discharge capacity of Fe3O4-CNTs was maintained at 1406 mAh/g after 200 cycles at a current density of 0.5 A/g. Even cycling at an ultra-high density of 10 A/g, the discharge capacity keeps at 230 mAh/g after 100 laps. Finally, after 9999 cycles, the discharge capacity still maintains at 179 mAh/g, which means only 50 mAh/g of discharge capacity was lost and the coulombic efficiency remains as high as 99.98%. This Fe3O4-CNTs composites show excellent performance under ultra-long cycle with large current density, which is important for the research of the anode materials.