Excellent Performance in Lithium-Ion Battery Anodes: Rational Synthesis of Co(CO3)0.5(OH)0.11H2O Nanobelt Array and Its Conversion into Mesoporous and Single-Crystal Co3O4
Excellent Performance in Lithium-Ion Battery Anodes: Rational Synthesis of Co(CO3)0.5(OH)0.11H2O Nanobelt Array and Its Conversion into Mesoporous and Single-Crystal Co3O4
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DOI：
10.1021/nn9012675
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发表时间：
2010-03-01
期刊：
影响因子：
17.1
通讯作者：
Lin, Jianyi
中科院分区：
文献类型：
--
作者：
Wang, Yu;Xia, Hui;Lin, Jianyi
本文报道了一种在导电基底上合成Co3O4纳米带阵列并将其功能化应用于锂离子电池负极的合理方法，这是一种新颖而简便的过渡金属氧化物纳米带阵列的制备方法。与以前的报道相比，在我们的实验中制备的样品表现出介孔性和单晶性，同时，与导电基底的良好接触（通过一层薄薄的TiO 2）提供了一个快速的电荷转移路径，当它们应用于锂离子电池时，无需添加其他辅助材料（炭黑或粘合剂）来提高系统的导电性和稳定性。在177 mA/g的高充放电电流密度条件下进行锂离子电池测试，Co3O4纳米带阵列在25次循环后仍能保持770 mAh/g的比容量。此外，即使充电-放电速率增加到1670和3350mA/g，其仍然可以分别达到510和330mAh/g的比容量的稳定保持超过30次循环，表明可获得优异的速率性能。更重要的是，锂离子电池测试中性能的提高肯定归功于我们经过精心分析后的样品中的独特结构。实验室合成的Co_3O_4纳米带阵列有望成为高容量、高性能的锂离子电池负极材料。
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.