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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Crystallization Behavior and Electrochemical Properties of Si50Al30Fe20 Amorphous Alloys as Anode for Lithium Secondary Batteries Prepared by Rapidly Solidification Process

액체급랭응고법으로 제조된 리튬 이차전지 음극활물질용 Si50Al30Fe20 비정질 합금의 결정화 거동 및 전기화학적 특성

  • Seo, Deok-Ho (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kim, Hyang-Yeon (EV Components & Materials R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Sung-Soo (Graduate School of Energy Science and Technology, Chungnam National University)
  • 서덕호 (충남대학교 에너지과학기술대학원) ;
  • 김향연 (한국생산기술연구원 EV부품소재그룹) ;
  • 김성수 (충남대학교 에너지과학기술대학원)
  • Received : 2019.04.05
  • Accepted : 2019.04.18
  • Published : 2019.07.01
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Abstract

This paper reports the microstructure and electrochemical properties of Si-Al-Fe ternary amorphous alloys prepared by rapid solidification as an anode for lithium secondary batteries. The microstructure was analyzed using XRD and HR-TEM with EDS mapping. In accordance with DSC analysis, annealing was performed to crystallize the active nano-Si in the amorphous alloy. Thus, nano-Si forms (~80 nm) embedded in the matrix alloy, such as $Fe_2Al_3Si_3$, $FeSi_2$, and $Fe_{0.42}Si_{2.67}$, were successfully synthesized. The electrode based on the Si-Al-Fe ternary alloy delivered an initial discharge capacity of approximately $700mAh^{g-1}$, and exhibited a high Coulombic efficiency of 99.0~99.6% from the $2^{nd}$ to $70^{th}$ cycles.

Keywords

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Fig. 1. Rapidly solidification process.

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Fig. 2. (a) XRD pattern and (b) TEM image of Si50Al30Fe20 amorphous alloy.

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Fig. 4. XRD patterns of Si50Al30Fe20 alloys in pristine state and further annealed 673 K, 773 K, 873 K, and 973 K, respectively.

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Fig. 5. TEM and SAED patterns of Si50Al30Fe20 alloys at (a) pristine state and further annealed at (b) 873 K, and (c) 973 K, respectively.

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Fig. 6. TEM micrographs of Si50Al30Fe20 alloys and EDS-mapping of Si, Al and Fe elements in (a) pristine state and further annealed (b) 873 K, and (c) 973 K, respectively.

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Fig. 8. Corresponding dQ/dV plots of Si50Al30Fe20 alloys in (a) pristine state, and further annealed at (b) 673 K, (c) 773 K, (d) 873 K, and (e) 973 K, respectively.

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Fig. 3. DSC plot of Si50Al30Fe20 alloy (dashed line indicates annealing temperature used in this study).

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Fig. 7. (a) Initial charge-discharge curves and (b) charge-discharge curves on 2nd cycle of Si50Al30Fe20 alloys in pristine, annealed at 673 K, 773 K, 873 K, and 973 K.

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Fig. 9. (a) Cycle performance and (b) capacity retention of Si50Al30Fe20 alloys in pristine annealed at 673 K, 773 K, 873 K, and 973 K states.

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