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Materials 2017, 10(4), 357; doi:10.3390/ma10040357

The Fabrication of Porous Si with Interconnected Micro-Sized Dendrites and Tunable Morphology through the Dealloying of a Laser Remelted Al–Si Alloy

High-Power and Ultrafast Laser Manufacturing Laboratory, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China
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Author to whom correspondence should be addressed.
Academic Editor: J. Paulo Davim
Received: 14 February 2017 / Revised: 6 March 2017 / Accepted: 8 March 2017 / Published: 28 March 2017
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

Coral-like porous Si was fabricated through the dealloying of a laser remelted as-cast AlSi12 alloy(Al-12 wt % Si). The porous Si was composed of interconnected micro-sized Si dendrites and micro/nanopores, and compared to flaky Si, which is fabricated by direct dealloying of the as-cast AlSi12 alloy. The structure of the porous Si was attributed to the dendritic solidification microstructure formed during the laser remelting process. The micropore size of the porous Si decreased from 4.2 μm to 1.6 µm with the increase in laser scanning velocity, indicating that the morphology of porous Si could be easily altered by simply controlling the laser remelting parameters. The coral-like porous Si provided enough space, making it promising for high-performance Si-based composite anode materials in lithium-ion batteries. The proposed hybrid method provides a straightforward way of tuning the porous structure in the dealloyed material. View Full-Text
Keywords: porous materials; laser processing; dealloying; silicon porous materials; laser processing; dealloying; silicon
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Huang, T.; Sun, D.; Yang, W.; Wu, Q.; Xiao, R. The Fabrication of Porous Si with Interconnected Micro-Sized Dendrites and Tunable Morphology through the Dealloying of a Laser Remelted Al–Si Alloy. Materials 2017, 10, 357.

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