State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, 130022, People's Republic of China.
ACS Nano. 2015 Feb 24;9(2):1592-9. doi: 10.1021/nn506252u. Epub 2015 Jan 30.
Hybridizing nanostructured metal oxides with multiwalled carbon nanotubes (MWCNTs) is highly desirable for the improvement of electrochemical performance of lithium-ion batteries. Here, a facile and scalable strategy to fabricate hierarchical porous MWCNTs/Co3O4 nanocomposites has been reported, with the help of a morphology-maintained annealing treatment of carbon nanotubes inserted metal organic frameworks (MOFs). The designed MWCNTs/Co3O4 integrates the high theoretical capacity of Co3O4 and excellent conductivity as well as strong mechanical/chemical stability of MWCNTs. When tested as anode materials for lithium-ion batteries, the nanocomposite displays a high reversible capacity of 813 mAh g(-1) at a current density of 100 mA g(-1) after 100 charge-discharge cycles. Even at 1000 mA g(-1), a stable capacity as high as 514 mAh g(-1) could be maintained. The improved reversible capacity, excellent cycling stability, and good rate capability of MWCNTs/Co3O4 can be attributed to the hierarchical porous structure and the synergistic effect between Co3O4 and MWCNTs. Furthermore, owing to this versatile strategy, binary metal oxides MWCNTs/ZnCo2O4 could also be synthesized as promising anode materials for advanced lithium-ion batteries.
将纳米结构金属氧化物与多壁碳纳米管（MWCNTs）杂交，对于提高锂离子电池的电化学性能是非常理想的。在这里，我们报告了一种简便且可扩展的策略，通过在保持碳纳米管插入金属有机骨架（MOFs）形貌的退火处理的帮助下，制备了分级多孔 MWCNTs/Co3O4 纳米复合材料。所设计的 MWCNTs/Co3O4 结合了 Co3O4 的高理论容量、优异的导电性以及 MWCNTs 的强机械/化学稳定性。当将其用作锂离子电池的阳极材料进行测试时，在 100 次充放电循环后，在 100 mA g(-1)的电流密度下，该纳米复合材料显示出 813 mAh g(-1)的高可逆容量。即使在 1000 mA g(-1)的电流密度下，也可以保持高达 514 mAh g(-1)的稳定容量。MWCNTs/Co3O4 的改进的可逆容量、优异的循环稳定性和良好的倍率性能归因于其分级多孔结构和 Co3O4 与 MWCNTs 之间的协同效应。此外，由于这种多功能策略，还可以合成二元金属氧化物 MWCNTs/ZnCo2O4，作为先进锂离子电池有前途的阳极材料。
