The Roles of Electrolyte Additives on Low-temperature Performances of Graphite Negative Electrode

전해액 첨가제가 흑연 음극의 저온특성에 미치는 영향

  • Park, Sang-Jin (Department of Chemical and Biological Engineering, and WCU program of C2E2, Seoul National University) ;
  • Ryu, Ji-Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University) ;
  • Oh, Seung-Mo (Department of Chemical and Biological Engineering, and WCU program of C2E2, Seoul National University)
  • 박상진 (서울대학교 화학생물공학부 및 WCU 프로그램(C2E2)) ;
  • 류지헌 (한국산업기술대학교 지식기반기술.에너지대학원) ;
  • 오승모 (서울대학교 화학생물공학부 및 WCU 프로그램(C2E2))
  • Received : 2011.11.30
  • Accepted : 2011.12.20
  • Published : 2012.02.28


SEI (solid electrolyte interphase) layers are generated on a graphite negative electrode from three different electrolytes and low-temperature ($-30^{\circ}C$) charge/discharge performance of the graphite electrode is examined. The electrolytes are prepared by adding 2 wt% of vinylene carbonate (VC) and fluoroethylene carbonate (FEC) into a standard electrolyte solution. The charge-discharge capacity of graphite electrode shows the following decreasing order; FEC-added one>standard>VC-added one. The polarization during a constant-current charging shows the reverse order. These observations illustrate that the SEI film resistance and charge transfer resistance differ according to the used additives. This feature has been confirmed by analyzing the chemical composition and thickness of three SEI layers. The SEI layer generated from the standard electrolyte is composed of polymeric carbon-oxygen species and the decomposition products ($Li_xPF_yO_z$) of lithium salt. The VC-derived surface film shows the largest resistance value even if the salt decomposition is not severe due to the presence of dense film comprising C-O species. The FEC-derived SEI layer shows the lowest resistance value as the C-O species are less populated and salt decomposition is not serious. In short, the FEC-added electrolyte generates the SEI layer of the smallest resistance to give the best low-temperature performance for the graphite negative electrode.


Supported by : 한국연구재단


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