Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effects of Porous Microstructure on the Electrochemical Properties of Si-Ge-Al Base Anode Materials for Li-ion Rechargeable Batteries

리튬이차전지용 다공성 Si-Ge-Al계 음극활물질의 전기화학적 특성

  • Cho, Chung Rae (Department of Energy Fusion Technologies, Inje University) ;
  • Kim, Myeong Geun (Department of Nanoscience and Engineering, Inje University) ;
  • Sohn, Keun Yong (Department of Nanoscience and Engineering, Inje University) ;
  • Park, Won-Wook (Department of Nanoscience and Engineering, Inje University)
  • 조충래 (인제대학교 에너지융합학과) ;
  • 김명근 (인제대학교 나노융합공학부) ;
  • 손근용 (인제대학교 나노융합공학부) ;
  • 박원욱 (인제대학교 나노융합공학부)
  • Received : 2016.09.03
  • Accepted : 2017.02.09
  • Published : 2017.02.28
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Abstract

Silicon alloys are considered promising anode active materials to replace Li-ion batteries by graphite powder, because they have a relatively high capacity of up to 4200 mAh/g, and are environmentally friendly and inexpensive ECO-materials. However, its poor charge/discharge properties, induced by cracking during cycles, constitute their most serious problem as anode electrode. In order to solve these problems, Si-Ge-Al alloys with porous structure are designed as anode alloy powders, to improve cycling stability. The alloys are melt-spun to obtain the rapidly solidified ribbons, and then ball-milled to make fine powders. The powders are etched using 1 M HCl solution, which gives the powders a porous structure by removing the element Al. Subsequently, in this study, the microstructures and the characteristics of the etched powders are evaluated for application as anode materials. As a result, the etched porous powder shows better electrochemical properties than as-milled Si-Ge-Al powder.

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References

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