Li Xiaoxia, Cheng Fangyi, Guo Bing, Chen Jun
Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
J Phys Chem B. 2005 Jul 28;109(29):14017-24. doi: 10.1021/jp051900a.
The first point of this work is to synthesize LiCoO2, LiNi0.8 Co0.2 O2, and LiMn2O4 nanotubes with the template of porous anodic aluminum oxide by thermal decomposition of sol-gel precursors. The as-synthesized materials were open-ended nanotubes with uniform shape and size based on the analysis of scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. An "in situ reaction from nanoparticle to nanotube" mechanism was discussed for the formation process of the nanotubes. The second point of this paper is to investigate the electrochemical properties of the as-synthesized nanotubes for the cathode materials of lithium ion batteries. It was found that the nanotube electrodes exhibited better reversibility and higher discharge capacities than that of their nanocrystalline counterparts. The reason for the improved electrochemical performance of the nanotube electrodes was also interpreted.
这项工作的第一点是通过溶胶 - 凝胶前驱体的热分解，以多孔阳极氧化铝为模板合成LiCoO₂、LiNi₀.₈Co₀.₂O₂和LiMn₂O₄纳米管。基于扫描电子显微镜、透射电子显微镜和X射线衍射分析，所合成的材料为具有均匀形状和尺寸的开口纳米管。针对纳米管的形成过程讨论了一种“从纳米颗粒到纳米管的原位反应”机制。本文的第二点是研究所合成的纳米管作为锂离子电池阴极材料的电化学性能。结果发现，纳米管电极比其纳米晶对应物表现出更好的可逆性和更高的放电容量。还解释了纳米管电极电化学性能改善的原因。
