Li Haipeng, Liu Zhengjun, Yang Shuang, Zhao Yan, Feng Yuting, Bakenov Zhumabay, Zhang Chengwei, Yin Fuxing
School of Materials Science & Engineering, Research Institute for Energy Equipment Materials, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, China.
Synergy Innovation Institute of GDUT, Heyuan 517000, China.
Materials (Basel). 2017 Sep 21;10(10):1102. doi: 10.3390/ma10101102.
ZnO/nitrogen-doped carbon nanotube (ZnO/NCNT) composite, prepared though a simple one-step sol-gel synthetic technique, has been explored for the first time as an anode material. The as-prepared ZnO/NCNT nanocomposite preserves a good dispersity and homogeneity of the ZnO nanoparticles (~6 nm) which deposited on the surface of NCNT. Transmission electron microscopy (TEM) reveals the formation of ZnO nanoparticles with an average size of 6 nm homogeneously deposited on the surface of NCNT. ZnO/NCNT composite, when evaluated as an anode for lithium-ion batteries (LIBs), exhibits remarkably enhanced cycling ability and rate capability compared with the ZnO/CNT counterpart. A relatively large reversible capacity of 1013 mAh·g is manifested at the second cycle and a capacity of 664 mAh·g is retained after 100 cycles. Furthermore, the ZnO/NCNT system displays a reversible capacity of 308 mAh·g even at a high current density of 1600 mA·g. These electrochemical performance enhancements are ascribed to the reinforced accumulative effects of the well-dispersed ZnO nanoparticles and doping nitrogen atoms, which can not only suppress the volumetric expansion of ZnO nanoparticles during the cycling performance but also provide a highly conductive NCNT network for ZnO anode.
通过简单的一步溶胶 - 凝胶合成技术制备的氧化锌/氮掺杂碳纳米管（ZnO/NCNT）复合材料首次被探索用作阳极材料。所制备的ZnO/NCNT纳米复合材料保持了沉积在NCNT表面的ZnO纳米颗粒（约6纳米）的良好分散性和均匀性。透射电子显微镜（TEM）显示平均尺寸为6纳米的ZnO纳米颗粒均匀地沉积在NCNT表面。当作为锂离子电池（LIBs）的阳极进行评估时，ZnO/NCNT复合材料与ZnO/CNT对应物相比，表现出显著增强的循环能力和倍率性能。在第二个循环中表现出相对较大的可逆容量1013 mAh·g，100次循环后保留容量为664 mAh·g。此外，即使在1600 mA·g的高电流密度下，ZnO/NCNT体系仍显示出308 mAh·g的可逆容量。这些电化学性能的提升归因于分散良好的ZnO纳米颗粒和掺杂氮原子的增强累积效应，这不仅可以抑制ZnO纳米颗粒在循环性能期间的体积膨胀，还可以为ZnO阳极提供高导电的NCNT网络。
