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Synthesis of Silicon-Carbon by Polymer Coating and Electrochemical Properties of Si-C|Li Cell

고분자 도포를 이용한 실리콘-탄소의 합성 및 Si-C|Li Cell의 전기화학적 특성

  • 도칠훈 (한국전기연구원 전지연구그룹) ;
  • 정기영 (한국전기연구원 전지연구그룹) ;
  • 진봉수 (한국전기연구원 전지연구그룹) ;
  • 안계혁 (성균관대학교 물리학과) ;
  • 민병철 (한국폴리텍7 창원대학 환경화학과) ;
  • 최임구 ((주)소디프 신소재) ;
  • 박철완 ((주)소디프 신소재) ;
  • 이경직 ((주)소디프 신소재) ;
  • 문성인 (한국전기연구원 전지연구그룹) ;
  • 윤문수 (한국전기연구원 전지연구그룹)
  • Published : 2006.08.01

Abstract

Si-C composites were prepared by the carbonization of silicon powder covered by polyaniline(PAn). Physical and electrochemical properties of the Si-C composites were characterized by the particle size analysis, X-ray diffraction technique, scanning electron microscope, and electrochemical test of battery. The average particle size of the Si was increased by the coating of PAn and somewhat reduced by the carbonization to give silicone-carbon composites. XRD analysis' results were confirmed co-existence of crystalline silicon and amorphous-like carbon. SEM photos showed that the silicon particle were well covered with carbonacious materials depend on the PAn content. Si-C|Li cells were fabricated using the Si-C composites and were tested using the galvanostatic charge-discharge test. Si-C|Li cells gave better electrochemical properties than that of Si|Li cell. Si-C|Li cell using the Si-C from HCl undoped PAn Precursor showed better electrochemical properties than that from HCl doped PAn Precursor. Using the electrolyte containing FEC as an additive, the initial discharge capacity was increased. After that the galvanostatic charge-discharge test with the GISOC(gradual increasing of the state of charge) condition was carried out. Si-C(Si:PAn:50:50 wt. ratio)|Li cell showed 414 mAh/g of the reversible specific capacity, 75.7% of IIE(initial intercalation efficiency), 35.4 mAh/g of IICs(surface irreversible specific capacity).

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