Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effective problem mitigation strategy of lithium secondary battery silicon anode utilized liquid precursor

에틸벤젠을 이용한 실리콘 산화물 음극재의 효과적인 카본 코팅 전략

  • Sangryeol Lee (Department of Industrial Chemistry, Pukyong National University) ;
  • Seongsu Park (Department of Industrial Chemistry, Pukyong National University) ;
  • Sujong Chae (Department of Industrial Chemistry, Pukyong National University)
  • 이상렬 (부경대학교 공업화학전공) ;
  • 박성수 (부경대학교 공업화학전공) ;
  • 채수종 (부경대학교 공업화학전공)
  • Received : 2023.01.04
  • Accepted : 2023.01.18
  • Published : 2023.02.28
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Abstract

Silicon (Si) is considered as a promising substitute for the conventional graphite due to its high theoretical specific capacity (3579 mAh/g, Li15Si4) and proper working voltage (~0.3V vs Li+/Li). However, the large volume change of Si during (de)lithiation brings about severe degradation of battery performances, rendering it difficult to be applied in the practical battery directly. As a one feasible candidate of industrial Si anode, silicon monoxide (SiOx) demonstrates great electrochemical stability with its specialized strategy, downsized Si nanocrystallites surrounded by Li+ inactive buffer phase (Li2O and Li4SiO4). Nevertheless, SiOx inherently has the initial irreversible capacity and poor electrical conductivity. To overcome those issues, conformal carbon coating has been performed on SiOx utilizing ethylbenzene as the carbon precursor of chemical vapor deposition (CVD). Through various characterizations, it is confirmed that the carbon is homogeneously coated on the surface of SiOx. Accordingly, the carbon-coated SiOx from CVD using ethylbenzene demonstrates 73% of the first cycle efficiency and great cycle life (88.1% capacity retention at 50th cycle). This work provides a promising synthetic route of the uniform and scalable carbon coating on Si anode for high-energy density.

Keywords

Acknowledgement

이 논문은 부경대학교 자율창의학술연구비(2021년)에 의하여 연구되었음.

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