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Thermal Stability of Surface Film Formed on a Graphite Negative Electrode in Lithium Secondary Batteries

리튬 이차전지의 흑연 음극에 형성된 표면피막의 열적 안정성

  • Jeong, Soon-Ki (Department of Chemical Engineering, Soonchunhyang University) ;
  • Lee, Ha-Na (Department of Chemical Engineering, Soonchunhyang University) ;
  • Kim, Yang-Soo (Suncheon Center, Korea Basic Science Institute)
  • 정순기 (순천향대학교 나노화학공학과) ;
  • 이하나 (순천향대학교 나노화학공학과) ;
  • 김양수 (한국기초과학지원연구원 순천센터)
  • Received : 2011.08.22
  • Accepted : 2011.08.25
  • Published : 2011.08.31

Abstract

The stability at elevated temperatures of a surface film formed on a graphite electrode in lithium secondary batteries was investigated by transmission electron microscopy (TEM) and electrochemical AC impedance spectroscopy (EIS). TEM analysis revealed that the surface film partly dissolved in the electrolyte solution during storage at $60^{\circ}C$, resulting in a decrease in the thickness of the surface film and a change in its morphology to a porous structure. On the other hand, an increase in the impedance of the surface film which is attributable to a change in composition of the surface film was confirmed by EIS analysis during the storage at $60^{\circ}C$. It was also shown that the addition of vinylene carbonate or 1,3-propane sultone or etylene sulfite, even if limited, improves the stability of the surface film at elevated temperatures.

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