화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.26, No.1, 80-85, February, 2015
Export Citation
리튬이온배터리 음극활물질 Silicon/Carbon 복합소재의 전기화학적 특성
Electrochemical Characteristics of Silicon/Carbon Composites for Anode Materials of Lithium Ion Batteries
박지용, 정민지, 이종대†
  • 충북대학교 화학공학과
Ji Yong Park, Min Zy Jung, and Jong Dae Lee†
  • Department of Chemical Engineering, Chungbuk national Univ., 410 Sungbong-ro, Heungduk-gu Cheong-ju, Chungbuk 361-763, Korea
E-mail:
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.
Silicon/carbon composites as anode materials for lithium-ion batteries were examined to find the cycle performance and capacity. Silicon/carbon composites were prepared by a two-step method, including the magnesiothermic reduction of SBA-15 (Santa Barbara Amorphous material No. 15) and carbonization of phenol resin. The electrochemical behaviors of lithium ion batteries were characterized by charge/discharge, cycle, cyclic voltammetry and impedance tests. The improved electrochemical performance attributed to the fact that silicon/carbon composites suppress the volume expansion of the silicon particles and enhance the conductivity of silicon/carbon composites (30 ohm) compared to that of using the pure silicon (235 ohm). The anode electrode of silicon/carbon composites showed the high capacity approaching 1,348 mAh/g and the capacity retention ratio of 76% after 50 cycles.
Keywords:Silicon/carbon;Anode material;SBA-15;magnesiothermic reduction;Lithium ion battery
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