Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Influence of Shell on the Electrochemical Properties of Si Nanoparticle

Si 나노입자에서 shell이 전기화학적 특성에 미치는 영향

  • 이정은 (한국에너지기술연구원 창의소재연구실) ;
  • 구정분 (한국에너지기술연구원 창의소재연구실) ;
  • 장보윤 (한국에너지기술연구원 창의소재연구실) ;
  • 김성수 (충남대학교 에너지과학기술대학원)
  • Received : 2016.03.11
  • Accepted : 2016.03.24
  • Published : 2016.04.01
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Abstract

Effects of $SiO_x$ or C shells on electrochemical properties of Si nanoparticles were investigated. $SiO_x$ shells with thickness of 10~15 nm were formed on homogeneously crystalline Si nanoparticles. Incase of Si-C nanoparticles, there were 30~40 layers of C with a number of defects. Li-ion batteries were fabricated with the above-mentioned nanoparticles, and their electrochemical properties were measured. Pristine Si shows a high IRC (initial reversible capacity) of 2,517 mAh/g and ICE (initial columbic efficiency) of 87%, but low capacity retention of 22%, respectively. $SiO_x$ shells decreased IRC (1,534 mAh/g) and ICE (54%), while the retention increased up to 65%, which can be explained by irreversible phases such as $LiO_2$ and $Li_2SiO_3$. C shells exhibited no differences in IRC and ICE compared to the pristine Si but an enhanced retention of 54%, which might be from proper defect structures.

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