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리튬이온배터리 음극활물질 Silicon/Carbon 복합소재의 전기화학적 특성

Electrochemical Characteristics of Silicon/Carbon Composites for Anode Materials of Lithium Ion Batteries

  • Park, Ji Yong (Department of Chemical Engineering, Chungbuk national Univ.) ;
  • Jung, Min Zy (Department of Chemical Engineering, Chungbuk national Univ.) ;
  • Lee, Jong Dae (Department of Chemical Engineering, Chungbuk national Univ.)
  • 투고 : 2014.10.29
  • 심사 : 2014.11.20
  • 발행 : 2015.02.10

초록

본 연구에서는 리튬이차전지의 음극활물질인 실리콘/탄소 복합소재를 제조하여 전기화학적 특성을 확인하였다. 실리콘/탄소 합성물은 마그네슘의 열 환원 반응을 통해 SBA-15 (Santa Barbara Amorphous material No. 15)를 제조한 후 페놀 수지의 탄화 과정을 통해 합성하였다. 실리콘/탄소를 음극으로 제조하여 충방전, 사이클, 순환전압전류, 임피던스 테스트를 통해 분석하였다. 실리콘에 코팅된 탄소는 전기 전도도를 향상시켜 Rct값을 235 ohm (silicon)에서 30 ohm (실리콘/탄소)으로 낮추었고 리튬의 탈 삽입 시에 발생하는 실리콘의 팽창을 억제하여 전극을 안정화시키는 효과를 보여주었다. 실리콘/탄소 전극을 사용한 리튬이차전지는 1,348 mAh/g의 용량을 나타내었고 50사이클 동안 76%의 안정성을 보여주었다.

키워드

Silicon/carbon;Anode material;SBA-15;magnesiothermic reduction;Lithium ion battery

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피인용 문헌

  1. Synthesis and Electrochemical Characteristics of Mesoporous Silicon/Carbon/CNF Composite Anode vol.26, pp.5, 2015, https://doi.org/10.14478/ace.2015.1056