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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Electrochemical Properties of SiOx Anodes with Conductive Agents for Li Ion Batteries

도전재 종류에 따른 리튬이차전지 음극재 SiOx의 전기화학적 특성

  • Yun, Ji-Su (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Jang, Boyun (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Kim, Sung-Soo (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kim, Hyang-Yeon (EV Components & Materials R&D Group, Korea Institute of Industrial Technology)
  • 연지수 (충남대학교 에너지과학기술대학원) ;
  • 장보윤 (한국에너지기술연구원 분리변환소재연구실) ;
  • 김성수 (충남대학교 에너지과학기술대학원) ;
  • 김향연 (한국생산기술연구원 EV부품소재그룹)
  • Received : 2019.03.08
  • Accepted : 2019.04.01
  • Published : 2019.05.01
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Abstract

This work investigated the effects of different conductive agents on the electrochemical properties of anodes. SiOx possesses high theoretical capacity and shows excellent cycle performance; however, the low initial coulombic efficiency and poor electrical conductivity limit its applications in real batteries. In this study, electrodes were fabricated using two different conductive agents, and the resulting physical and electrochemical properties were analyzed. SEM observations confirmed the formation of a CNT conductive network throughout the electrodes, while the electrical conductivity contributed to the electrode was confirmed by impedance measurements. Thus, the electrode fabricated with the CNT conductive agent showed greater capacity and superior cycle performance than did the electrode fabricated using the DB conductive agent.

Keywords

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Fig. 1. X-ray diffraction (XRD) patterns of (a) SiOx nanoparticles and (b) SiOx with conductive agents.

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Fig. 2. SEM images of (a) SiOx nanoparticles, (b) SiOx with denka black (DB), and (c) SiOx with carbon nanotubes (CNT).

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Fig. 3. Charge-discharge profiles and corresponding dQ/dV plots of SiOx with DB or CNT conductive agents at (a), (b) 1st and 2nd cycles (0.21 A/g charge).

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Fig. 4. (a) Cycle performance and (b) coulombic efficiency of SiOx with DB or CNT conductive agents.

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Fig. 5. (a) Schematic representation of changes in DB loaded anodes and (b) schematic representation of changes in CNT loaded anodes.

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Fig. 6. Charge-discharge profiles of SiOx with (a) DB (b) CNT conductive agents at various current densities, and (c) rate capability of SiOx with DB or CNT conductive agents.

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Fig. 7. (a) Electrochemical impedance spectroscopy (EIS) of iOx with DB and CNT conductive agents and (b) equivalent circuits used ti fit the impedance data.

Table 1. Electrical resistivities of two kinds of conductive agents and the corresponding composite cathodes (10-2 Ω).

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Table 2. Electrical resistivities of two kinds of conductive agents and the corresponding composite SiOx.

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