SnO2 nanorods grown on MCMB as the anode material for lithium ion battery

SnO2 nanorods grown on MCMB as the anode material for lithium ion battery
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MCMB 上生长的 SnO2 纳米棒作为锂离子电池负极材料

DOI:
10.1016/j.jallcom.2013.06.158
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发表时间:
2013-12
影响因子:
6.2
通讯作者:
Juan Li
Juan Li
中科院分区:
材料科学2区
文献类型:
--
作者:
Shejun Hu;Dawei Sun;Xiong Song;Juan Li

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采用化学沉淀和水热反应制备SnO2纳米棒/MCMB复合材料。首先用浓硫酸和硝酸的混合物处理中间相碳微珠(MCMB),然后通过化学沉淀法沉积少量的SnO2,形成原始的SnO2/MCMB复合材料。在水热条件下和一定浓度的Na2SnO3下,这种原始复合材料最终转变为SnO2纳米棒/MCMB复合材料。 SEM图显示SnO2纳米棒在MCMB表面广泛生长; TEM 和 XRD 表征表明 SnO2 纳米棒具有良好的单晶结构,直径为 50 nm,长度为 400–500 nm。以下电化学性能表明,最终复合材料的初始放电容量为 1321.25 mA h g−1。在 100 mA g−1 等恒定电流密度下进行 50 次放电/充电循环后,观察到可逆容量为 505.8 mA h g−1。
Chemical precipitation and hydrothermal reaction were adopted to prepare the SnO2nanorods/MCMB composite. Firstly Mesophase carbon micro beads (MCMB) were treated by the mixture of concentrated sulphuric acid and nitric acid, and then deposited with a little amount of SnO2though chemical precipitation to form the primitive SnO2/MCMB composite. In hydrothermal condition and at certain concentration of Na2SnO3, such primitive composite turned into the SnO2nanorods/MCMB composite eventually. SEM figures showed that SnO2nanorods grow on the surface of MCMB extensively; TEM and XRD characterization indicated SnO2nanorods presenting good single crystalline structure with 50 nm in diameter and 400–500 nm in length. The following electrochemical performance showed that the final composite exhibited initial discharge capacity of 1321.25 mA h g−1. Reversible capacity of 505.8 mA h g−1was observed after 50 discharge/charge cycles at the constant current density of 100 mA g−1etc.
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