The fabrication of porous Si with interconnected micro-sized dendrites and tunable morphology through the dealloying of a laser remelted Al-Si alloy

Ting Huang, Dingyue Sun, Wuxiong Yang, Qiang Wu, Rongshi Xiao

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

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.

Original languageEnglish
Article number357
JournalMaterials
Volume10
Issue number4
DOIs
Publication statusPublished - 2017 Mar 28
Externally publishedYes

Keywords

  • Dealloying
  • Laser processing
  • Porous materials
  • Silicon

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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