한국재료학회지 (Korean Journal of Materials Research)

  • 제34권7호
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  • Pages.370-376
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  • 2024
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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리튬 배터리 음극용 SiO2 코어 쉘을 갖춘 나노 다공성 실리콘 입자 제조

Fabrication of Nano Porous Silicon Particle with SiO2 Core Shell for Lithium Battery Anode

  • 심보림 (단국대학교 파운드리공학과) ;
  • 김은하 (단국대학교 에너지공학과) ;
  • 임현민 (단국대학교 에너지공학과) ;
  • 김원진 (단국대학교 파운드리공학과) ;
  • 김우병 (단국대학교 파운드리공학과)
  • Borim Shim (Department of Foundry Engineering, Dankook University) ;
  • Eunha Kim (Department of Energy Engineering, Dankook University) ;
  • Hyeonmin Yim (Department of Energy Engineering, Dankook University) ;
  • Won Jin Kim (Department of Foundry Engineering, Dankook University) ;
  • Woo-Byoung Kim (Department of Foundry Engineering, Dankook University)
  • 투고 : 2024.02.27
  • 심사 : 2024.07.03
  • 발행 : 2024.07.27
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초록

In this study, we report significant improvements in lithium-ion battery anodes cost and performance, by fabricating nano porous silicon (Si) particles from Si wafer sludge using the metal-assisted chemical etching (MACE) process. To solve the problem of volume expansion of Si during alloying/de-alloying with lithium ions, a layer was formed through nitric acid treatment, and Ag particles were removed at the same time. This layer acts as a core-shell structure that suppresses Si volume expansion. Additionally, the specific surface area of Si increased by controlling the etching time, which corresponds to the volume expansion of Si, showing a synergistic effect with the core-shell. This development not only contributes to the development of high-capacity anode materials, but also highlights the possibility of reducing manufacturing costs by utilizing waste Si wafer sludge. In addition, this method enhances the capacity retention rate of lithium-ion batteries by up to 38 %, marking a significant step forward in performance improvements.

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