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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Granulations of SiOx Nanoparticles to Improve Electrochemical Properties as a Li-Ion Battery's Anode

리튬이온전지 음극용 SiOx 나노입자의 조대화를 통한 전기화학 특성 향상

  • Lee, Bora (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Lee, Jae Young (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Jang, Boyun (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Kim, Joonsoo (Separation and Conversion Materials Laboratory, Korea Institute of Energy Research) ;
  • Kim, Sung-Soo (Graduate School of Energy Science and Technology, Chungnam National University)
  • 이보라 (한국에너지기술연구원 분리변환소재연구실) ;
  • 이재영 (한국에너지기술연구원 분리변환소재연구실) ;
  • 장보윤 (한국에너지기술연구원 분리변환소재연구실) ;
  • 김준수 (한국에너지기술연구원 분리변환소재연구실) ;
  • 김성수 (충남대학교 에너지과학기술대학원)
  • Received : 2018.09.05
  • Accepted : 2018.10.19
  • Published : 2019.01.01
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Abstract

$SiO_x$ nanoparticles were granulated, and their microstructures and effects on electrochemical behaviors were investigated. In spite of the promising electrochemical performance of $SiO_x$, nanoparticles have limitations such as high surface area, low density, and difficulty in handling during slurry processing. Granulation can be one solution. In this study, pelletizing and annealing were conducted to create particles with sizes of several decades of micron. Decrease in surface area directly influences the initial charge and discharge process when granules are applied as anode materials for Li-ion batteries. Lower surface area is key to decreasing the amount of irreversible phase-formation, such as $Li_2Si_2O_5$, $Li_2SiO_3$ and $Li_4SiO_4$, as well as forming the solid electrolyte interface. Additionally, aggregation of nanoparticles is required to obtain further enhancement of the electrochemical behavior due to restrictions that there be no $Li_4SiO_4$-related reaction during the first discharge process.

Keywords

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Fig. 1. Process flow chart.

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Fig. 2. FE-SEM image of (a) nanoparticles (G0) and granulated microparticles by various annealing temperatures [(b) G1, (c) G2,and (d) G3].

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Fig. 3. XRD patterns of (a) nanoparticles (G0) and granulated microparticles by various annealing temperatures [(b) G1, (c) G2,and (d) G3].

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Fig. 4. Raman spectra of single crystalline Si as a reference, G0, and G3.

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Fig. 5. Cycle performances of nanoparticles (G0) and granulated microparticles by various annealing temperatures (G1, G2, and G3).

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Fig. 7. Initial reversible capacity (circle pattern), initial coulombicefficiency (square pattern), capacity retention (diamond pattern) andswelling after 50 cycles (triangle pattern) of G0, G1, G2, and G3.

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Fig. 6. (a) The first voltage profiles and (b) differential capacities of nanoparticles (G0) and granulated microparticles by various annealing temperatures (G1, G2, and G3).

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