한국재료학회지 (Korean Journal of Materials Research)

  • 제34권10호
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  • Pages.497-505
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  • 2024
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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보령 머드로부터 제조한 우수한 수명 안정성의 실리콘계 음극 소재

Boryeong Mud-Derived Silicon-Oxides Composite Anodes with Excellent Cycling Stability for Lithium-Ion Batteries

  • 김윤아 (단국대학교 에너지공학과) ;
  • 이재원 (단국대학교 에너지공학과)
  • Yun A Kim (Department of Energy Engineering, Dankook University) ;
  • Jae-Won Lee (Department of Energy Engineering, Dankook University)
  • 투고 : 2024.07.08
  • 심사 : 2024.09.30
  • 발행 : 2024.10.27
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초록

Silicon-based anode materials have attracted significant interest because of their advantages, including high theoretical specific capacity (~4,200 mAh/g), low working potential (0.4 V vs Li/Li+), and abundant sources. However, their significant initial capacity loss and large volume changes during cycling impede the application of silicon-based anodes in lithium-ion batteries. In this work, we propose a silicon oxide (SiOx) anode material for lithium-ion batteries produced with a magnesio-thermic reduction (MTR) process adopting Boryeong mud as a starting material. Boryeong mud contains various minerals such as clinochlore [(Mg,Fe)6(Si,Al)4O10(OH)8], anorthite (CaAl2Si2O8), illite [K0.7Al2(Si,Al)4O10(OH)2], and quartz (SiO2). The MTR process with Boryeong mud generates a mixture of amorphous silicon oxides (SiOx and SiO2), and magnesium aluminate which helps to alleviate the volume expansion of the electrode during charge/discharge. To observe the effects of these oxides, we conducted various analyses including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-Transformation infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET) and cyclic voltammetry (CV) galvanic cell testing. The amorphous SiO2 and MgAl2O4 suppressed the volume expansion of the silicon-based anode, and excellent cycle performance was achieved as a result.

키워드

과제정보

This work was supported by the Technology development Program (RS-2023-00270124) funded by the Ministry of SMEs and Startups (MSS, Korea). The authors also thank to Dr. Dae Weon Kim for providing Boryeong mud.

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