화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.27, No.4, 444-448, August, 2016
DOI10.14478/ace.2016.1055  Export Citation
리튬이차전지용 Hollow Silicon/Carbon 음극소재의 전기화학적 성능
Electrochemical Performance of Hollow Silicon/Carbon Anode Materials for Lithium Ion Battery
정민지, 이종대†
  • 충북대학교 화학공학과
Min Ji Jung, and Jong Dae Lee†
  • Department of Chemical Engineering, Chungbuk National University, 1 Chungdearo, Seowongu Cheongju, Chungbuk 28644, Korea
E-mail:
초록
이차전지 음극소재인 실리콘의 부피팽창을 개선하기 위하여 hollow silicon/carbon (H-Si/C) 복합체의 특성을 조사하였다. Stober법을 통해 합성한 SiO2에 NaBH4를 첨가해 hollow 형태의 SiO2 (H-SiO2)를 제조한 후, 마그네슘 열 환원 반응과 phenolic 수지(resin)를 첨가한 후 탄화과정을 거쳐서 H-Si/C 복합체를 합성하였다. 제조된 H-Si/C 합성물은 XRD, SEM, BET, EDX, TGA를 통해 특성을 분석하였다. 음극소재의 용량과 사이클 안정성을 향상시키기 위해서, NaBH4 첨가량에 따라 합성된 H-Si/C 복합체의 전기화학적 특성을 충방전, 사이클, 순환전압전류, 임피던스 테스트를 통해 조사하였다. H-Si/C 음극활물질과 LiPF6 (EC : DMC : EMC = 1 : 1 : 1 vol%) 전해액을 사용하여 제조한 코인셀은 SiO2 : NaBH4 = 1 : 1일 때 1459 mAh/g의 향상된 용량을 나타내었으며, 사이클 성능 또한 두 번째 사이클 이후 40번째 사이클까지 매우 우수한 안정성을 나타냄을 확인하였다.
Hollow silicon/carbon (H-Si/C) composites as anode materials for lithium ion batteries were investigated to overcome the large volume expansion. H-Si/C composites were prepared as follows; hollow SiO2 (H-SiO2) was prepared by adding NaBH4 to SiO2 synthesized using stober method followed by magnesiothermic reduction and carbonization of phenolic resin. The H-Si/C composites were analyzed by XRD, SEM, BET and EDX. To improve the capacity and cycle performance, the electrochemical characteristics of H-Si/C composites synthesized with various NaBH4 contents were investigated by charge/discharge, cycle, cyclic voltammetry and impedance tests. The coin cell using H-Si/C composite (SiO2 : NaBH4 = 1 : 1 in weight) in the electrolyte of LiPF6 dissolved in organic solvents (EC : DMC : EMC = 1 : 1 : 1 vol%) has better capacity (1459 mAh/g) than those of other composition coin cells. It is found that the coin cell (SiO2 : NaBH4 = 1 : 1 in weight) has an excellent capacity retention from 2nd cycle to 40th cycle.
Keywords:stober method;hollow SiO2;NaBH4 etching;Mg reduction;lithium ion battery
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