期刊
ACS NANO
卷 4, 期 3, 页码 1425-1432出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn9012675
关键词
nanobelt array; mesoporous; lithium-ion batteries; capacity; capability
类别
资金
- Intelligent Energy Distribution Systems (IEDS) of Agency for Science, Technology, and Research (ASTAR) in Singapore
Herein, we report a rational method to synthesize a Co3O4 nanobelt array on a conducting substrate and functionalize it in the application of Li-ion battery anodes, which is a novel and facile approach to access the nanobelt array of transition metal oxides. Compared to the previous reports, the as-prepared samples in our experiments exhibited both mesoporosity and single-crystallinity, and meanwhile, good contact with the conducting substrate (via a thin layer of TiO2) provided an express pathway for charge transfer when they were applied in Li-ion batteries without any need to add other ancillary materials (carbon black or binder) to enhance the system's conductivity and stability. Under the condition of high charge-discharge current density of 177 mA/g in Li-ion batteries' testing, the Co3O4 nanobelt array was capable of retaining the specific capacity of 770 mAh/g over 25 cycles. Moreover, even though the charge-discharge rates were increased to 1670 and 3350 mA/g it still could have reached the stable retention of the specific capacity of 510 and 330 mAh/g beyond 30 cycles, respectively, indicating an obtainable excellent rate capability. More importantly, the improved performance in Li-ion battery testing was definitely ascribed to the unique structures in our samples after elaborate analysis. So the final conclusion would be given that the lab-synthesized Co3O4 nanobelt array potentially could be a highly qualified candidate for Li-ion battery anodes in some practical fields, where high capacity and good capability are strictly required.
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