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Germanium nanowires-based carbon composite as anodes for lithium-ion batteries

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Title: Germanium nanowires-based carbon composite as anodes for lithium-ion batteries
Authors: Tan, Li Ping1, Lu, Ziyang1, Tan, Hui Teng1, Zhu, Jixin1, Rui, Xianhong1,2, Yan, Qingyu1,3, Hng, Huey Hoon1,3 ashhhng@ntu.edu.sg
Source: Journal of Power Sources. May2012, Vol. 206, p253-258. 6p.
Subjects: Lithium-ion batteries, Germanium, Nanowires, Carbon composites, Energy storage, Current density (Electromagnetism), Electric potential
Abstract: Abstract: Lithium-ion batteries have been actively researched in recent years due to it being one of the most promising energy storage systems. Herein, we report a novel approach where germanium nanowires (Ge NW) are grown in gold-seeded porous carbon via the solution–liquid–solid mechanism, and the corresponding improvement observed in terms of the specific capacity of this porous carbon–germanium nanowires (PC–Ge NW) composite anode. At a current density of 160mAg−1 and voltage window of 0.001–1.5V, a specific capacity of 789mAhg−1 during the 50th cycle for PC–Ge NW is achieved as compared to 624mAhg−1 during the 50th cycle for pure Ge NW. Even though the content of the Ge is only 53.5 weight percent in the PC–Ge NW composite, it yields a better stability and higher specific capacity, indicating a synergistic effect between porous carbon and Ge nanowires. There is also potential cost savings since the use of a lower amount of Ge can bring about good cycling properties. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: Lithium-ion batteries have been actively researched in recent years due to it being one of the most promising energy storage systems. Herein, we report a novel approach where germanium nanowires (Ge NW) are grown in gold-seeded porous carbon via the solution–liquid–solid mechanism, and the corresponding improvement observed in terms of the specific capacity of this porous carbon–germanium nanowires (PC–Ge NW) composite anode. At a current density of 160mAg−1 and voltage window of 0.001–1.5V, a specific capacity of 789mAhg−1 during the 50th cycle for PC–Ge NW is achieved as compared to 624mAhg−1 during the 50th cycle for pure Ge NW. Even though the content of the Ge is only 53.5 weight percent in the PC–Ge NW composite, it yields a better stability and higher specific capacity, indicating a synergistic effect between porous carbon and Ge nanowires. There is also potential cost savings since the use of a lower amount of Ge can bring about good cycling properties. [Copyright &y& Elsevier]
ISSN:03787753
DOI:10.1016/j.jpowsour.2011.12.064