Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Tin Germanium Sulfide Nanoparticles for Enhanced Performance Lithium Secondary Batteries

고성능 리튬 이차 전지를 위한 황화 주석 저마늄 (SnxGe1-xS) 나노입자 연구

  • Cha, E.H. (Dept. of Pharmacy, Hoseo Univ.) ;
  • Kim, Y.W. (Graduated School of Green energy engineering, Hoseo Univ.) ;
  • Lim, S.A. (Graduated School of Green energy engineering, Hoseo Univ.) ;
  • Lim, J.W. (POSCO ICT, Strategic planning)
  • 차은희 (호서대학교 제약공학과) ;
  • 김영운 (호서대학교 그린에너지공학과 대학원) ;
  • 임수아 (호서대학교 그린에너지공학과 대학원) ;
  • 임재욱 (포스코 ICT 전략기획팀)
  • Received : 2015.02.09
  • Accepted : 2015.02.11
  • Published : 2015.02.28
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Abstract

Composition-controlled ternary components chalcogenides germanium tin sulfide ($Sn_xGe_{1-x}S$) nanoparticles were synthesized by a novel gas-phase laser photolysis reaction of tetramethyl germanium, tetramethyl tin, and hydrogen sulfide mixture. Subsequent thermal annealing of as-grown amorphous nanoparticles produced the crystalline orthorhombic phase nanoparticles. All these composition-tuned nanoparticles showed excellent cycling performance of the lithium ion battery. The germanium sulfide nanoparticles exhibit a maximum capacity of 1200 mAh/g after 70 cycles. As the tin composition (x) increases, the capacity maintains better at the higher discharge/charge rate. This novel synthesis method of tin germanium sulfide nanoparticles is expected to contribute to expand their applications in high-performance energy conversion systems.

삼성분 칼코게나이드 화합물인 황화 주석 저마늄 ($Sn_xGe_{1-x}S$) 합금 나노입자를 메틸 주석 $(Sn(CH_3)_4$, tetramethyl tin, TMT) 메틸 저마늄 $(Ge(CH_3)_4$, tetramethyl germanium, TMG), 황화수소 ($H_2S$, hydrogen sulfide) 혼합 가스의 레이저 광분해 반응법으로 합성할 수 있으며, 이때 반응기 안의 가스 혼합비율에 따라 나노입자의 주석과 저마늄의 조성비를 조절할 수 있었다. 조성비를 가변시킨 나노입자는 모두 결정성을 갖게 만들 수 있었으며, 리튬 이온 전지의 음극소재로서 우수한 특성을 보여주었다. 조성비에 따라 특성을 조사결과, 황화저마늄은 70 사이클 후 최대 1200 mAh/g의 가장 높은 방전용량을 갖는 것과, 주석 성분 함량이 클수록 높은 충방전률에서 용량 유지가 더 잘 됨을 확인하였다. 이와 같은 우수한 효율의 황화물 합금 나노입자의 새로운 대량 합성법은 고성능 에너지 변환 소재 실용화에 기여할 것으로 예상된다.

Keywords

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