材料科学
纳米片
镓
硫系化合物
碳纳米管
阳极
剥脱关节
纳米技术
化学工程
电极
异质结
电池(电)
纳米复合材料
电化学
纳米管
石墨烯
光电子学
物理化学
化学
冶金
功率(物理)
工程类
物理
量子力学
作者
Chuanfang Zhang,Sang Hoon Park,Oskar Ronan,Andrew Harvey,Andrés Seral‐Ascaso,Zifeng Lin,Niall McEvoy,Conor S. Boland,Nina C. Berner,Georg S. Duesberg,Patrick Rozier,Jonathan N. Coleman,Valeria Nicolosi
出处
期刊:Small
[Wiley]
日期:2017-07-10
卷期号:13 (34)
被引量:72
标识
DOI:10.1002/smll.201701677
摘要
2D metal chalcogenide (MC) nanosheets (NS) have displayed high capacities as lithium‐ion battery (LiB) anodes. Nevertheless, their complicated synthesis routes coupled with low electronic conductivity greatly limit them as promising LiB electrode material. Here, this work reports a facile single‐walled carbon nanotube (SWCNT) percolating strategy for efficiently maximizing the electrochemical performances of gallium chalcogenide (GaX, X = S or Se). Multiscaled flexible GaX NS/SWCNT heterostructures with abundant voids for Li + diffusion are fabricated by embedding the liquid‐exfoliated GaX NS matrix within a SWCNT‐percolated network; the latter improves the electron transport and ion diffusion kinetics as well as maintains the mechanical flexibility. Consequently, high capacities (i.e., 838 mAh g −1 per gallium (II) sulfide (GaS) NS/SWCNT mass and 1107 mAh g −1 per GaS mass; the latter is close to the theoretical value) and good rate capabilities are achieved, which can be majorly attributed to the alloying processes of disordered Ga formed after the first irreversible GaX conversion reaction, as monitored by in situ X‐ray diffraction. The presented approach, colloidal solution processing of SWCNT and liquid‐exfoliated MC NS to produce flexible paper‐based electrode, could be generalized for wearable energy storage devices with promising performances.
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