5L-Scale Magnesio-Milling Reduction of Nanostructured SiO2 for High Capacity Silicon Anodes in Lithium-Ion Batteries

Won Chul Cho, Hye Jin Kim, Hae In Lee, Myung Won Seo, Ho Won Ra, Sang Jun Yoon, Tae Young Mun, Yong Ku Kim, Jae Ho Kim, Bo Hwa Kim, Jin Woo Kook, Chung Yul Yoo, Jae Goo Lee, Jang Wook Choi

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Nanostructured silicon (Si) is useful in many applications and has typically been synthesized by bottom-up colloid-based solution processes or top-down gas phase reactions at high temperatures. These methods, however, suffer from toxic precursors, low yields, and impractical processing conditions (i.e., high pressure). The magnesiothermic reduction of silicon oxide (SiO2) has also been introduced as an alternative method. Here, we demonstrate the reduction of SiO2 by a simple milling process using a lab-scale planetary-ball mill and industry-scale attrition-mill. Moreover, an ignition point where the reduction begins was consistently observed for the milling processes, which could be used to accurately monitor and control the reaction. The complete conversion of rice husk SiO2 to high purity Si was demonstrated, taking advantage of the rice husk's uniform nanoporosity and global availability, using a 5L-scale attrition-mill. The resulting porous Si showed excellent performance as a Li-ion battery anode, retaining 82.8% of the initial capacity of 1466 mAh g-1 after 200 cycles.

Original languageEnglish
Pages (from-to)7261-7269
Number of pages9
JournalNano Letters
Volume16
Issue number11
DOIs
StatePublished - 9 Nov 2016

Keywords

  • attrition mill
  • ignition time
  • lithium-ion battery
  • magnesio-milling reduction
  • silicon anode

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