Germanium coated vertically-aligned multiwall carbon nanotubes as lithium-ion battery anodes
Germanium coated vertically-aligned multiwall carbon nanotubes as lithium-ion battery anodes
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DOI：
10.1016/j.carbon.2014.05.060
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发表时间：
2014-10-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Qing
中科院分区：
文献类型：
--
作者：
Susantyolzo, Rahmat Agung;Wang, Xinghui;Zhang, Qing
系统研究了多晶和非晶锗作为锂离子电池负极活性材料的性能。采用低压化学气相沉积法和射频溅射法分别制备了多晶Ge/多壁碳纳米管阵列（MWCNT/c-Ge）和非晶Ge/MWCNT阵列（MWCNT/a-Ge）。垂直排列的MWCNT阵列用作平台以最小化粉碎问题。MWCNT/a-Ge在162.4 mA g（-1）的倍率下循环100次，比容量为1096.1 mA hg（-1）。相比之下，MWCNT/c-Ge在162.4 mA g（-1）的速率下在第100次循环时仅显示出730.2 mA hg（-1）的比容量。MWCNT/a-Ge样品表现出更好的性能，因为MWCNT/a-Ge在第一次锂化期间跳过了结晶Ge的电化学驱动的固态非晶化。(C)2014爱思唯尔有限公司版权所有。
The performance of polycrystalline and amorphous germanium (Ge) as anode active materials for lithium-ion batteries was studied systematically. Polycrystalline Ge on vertically-aligned multiwall carbon nanotube (MWCNT) arrays (MWCNT/c-Ge) and amorphous Ge on the arrays (MWCNT/a-Ge) were fabricated using a low pressure chemical vapor deposition system and a radio frequency sputtering system, respectively. The vertically-aligned MWCNT arrays were used as a platform to minimize pulverization problem. The MWCNT/a-Ge had a specific capacity of 1096.1 mA hg(-1) at the rate of 162.4 mA g(-1) at the 100th cycle. In comparison, the MWCNT/c-Ge only showed a specific capacity of 730.2 mA hg(-1) at the rate of 162.4 mA g(-1) at the 100th cycle. The MWCNT/a-Ge sample showed better performances as the MWCNT/a-Ge skipped the electrochemically-driven solid-state amorphization of crystalline Ge during the first lithiation. (C) 2014 Elsevier Ltd. All rights reserved.