One-pot Aerosol Synthesis of Carbon Nanotube-Zn2GeO4 Composite Microspheres for Enhanced Lithium-ion Storage Properties
One-pot Aerosol Synthesis of Carbon Nanotube-Zn2GeO4 Composite Microspheres for Enhanced Lithium-ion Storage Properties
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DOI：
10.1016/j.electacta.2015.12.163
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发表时间：
2016-02-01
影响因子：
6.6
通讯作者：
Kang, Yun Chan
中科院分区：
文献类型：
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作者：
Choi, Seung Ho;Kim, Jong Hwa;Kang, Yun Chan
应用水溶性金属盐和氧化碳纳米管纤维，采用简单的一锅法喷雾热解法制备了具有非团聚特性的三维碳纳米管多组分复合微球。在液滴干燥阶段，将具有大长径比的柔性碳纳米管连成网络，形成了碳纳米管的层次化多孔三维结构。随后，将锌和锗盐沉积在碳纳米管上，形成了氧化锌-碳纳米管和GeO2-碳纳米管复合微球。将锌和锗盐分解成各自的氧化物，在700℃下转化反应生成Zn2GeO4，得到了Zn2GeO4-CNT复合微球。当电流密度为1.5Ag(-1)时，4种材料的首次放电容量分别为1351、1211、1387和1631 mA h g(-1)，300次循环的放电容量分别为415、762、261和480 mA h g(-1)。选择CNT-Zn2GeO4复合微球作为第一靶材，其电化学性能优于裸的Zn2GeO4、CNT-ZnO和CNT-GeO2复合微球。多组分组成的Zn2GeO4与碳纳米管载体的协同作用使得复合微球具有优异的锂离子存储性能。(C)2015爱思唯尔有限公司。保留所有权利。
Three-dimensional (3D) carbon nanotube (CNT)-multicomponent metal oxide composite microspheres with non-aggregation characteristics are prepared using a simple one-pot spray pyrolysis process, applying water-soluble metal salt and oxidized CNT fibers. The hierarchical porous 3D structure of the CNT is formed by networking the flexible CNTs with a high aspect ratio during the drying stage of a droplet. Subsequently, the Zn and Ge salts are deposited over the CNTs to form the ZnO-CNT and GeO2-CNT composite microsphere. Decomposition of Zn and Ge salts into their respective oxides and the conversion reaction to form Zn2GeO4 at 700 degrees C, produce the Zn2GeO4-CNT composite microsphere. The initial discharge capacities of the Zn2GeO4, Zn2GeO4-CNT, ZnO-CNT, and GeO2-CNT microspheres, at a current density of 1.5 A g(-1), are 1351, 1211, 1387, and 1631 mA h g(-1), respectively, and their discharge capacities at the 300th cycle are 415, 762, 261, and 480 mA h g(-1), respectively. The CNT-Zn2GeO4 composite microspheres, selected as the first target material, show electrochemical properties superior to those of the bare Zn2GeO4, CNT-ZnO, and CNT-GeO2 composite microspheres. The synergetic effect of the multicomponent composition of Zn2GeO4 and the CNT support result in excellent Li-ion storage properties of the Zn2GeO4-CNT composite microspheres. (C) 2015 Elsevier Ltd. All rights reserved.