Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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The Influence of Impurities in Room Temperature Ionic Liquid Electrolyte for Lithium Ion Batteries Containing High Potential Cathode

고전압 리튬이차전지를 위한 LiNi0.5Mn1.5O4 양극용 전해질로써 상온 이온성 액체 전해질의 불순물 효과에 관한 연구

  • Kim, Jiyong (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Tron, Artur V. (Department of Energy and Chemical Engineering, Incheon National University) ;
  • Yim, Taeeun (Advanced Batteries Research Center, KETI) ;
  • Mun, Junyoung (Department of Energy and Chemical Engineering, Incheon National University)
  • 김지용 (인천대학교 에너지화학공학과) ;
  • ;
  • 임태은 (전자부품연구원) ;
  • 문준영 (인천대학교 에너지화학공학과)
  • Received : 2015.03.31
  • Accepted : 2015.04.04
  • Published : 2015.05.31
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Abstract

We report the effect of the impurities including water and bromide in the propylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMPyr-TFSI) on the electrochemical performance of lithium ion batteries. The several kinds of PMPyr-TFSI electrolytes with different amount of impurities are applied as the electrolyte to the cell with the high potential electrode, $LiNi_{0.5}Mn_{1.5}O_4$ spinel. It is found that the impurities in the electrolytes cause the detrimental effect on the cell performance by tracing the cycleability, voltage profile and Coulombic efficiency. Especially, the polarization and Coulombic efficiency go to worse by both impurities of water and bromide, but the cycleability was not highly influenced by bromide impurity unlike the water impurity.

상온 이온성 액체인 propylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMPyr-TFSI)를 리튬이차전지 전해질 용매로 사용 시 PMPyr-TFSI 내 수분 및 브롬 불순물이 전지의 성능에 미치는 영향을 연구하였다. 고전압 양극 물질인 $LiNi_{0.5}Mn_{1.5}O_4$ 스피넬 구조 양극을 이용한 반쪽 전지의 전해질로 PMPyr-TFSI를 사용 하는데 있어, PMPyr-TFSI의 수분 함유량을 각각 12, 77, 1060 ppm으로 제어하고 전압 곡선 개형 및 쿨롱 효율 거동 추적을 통해 PMPyr-TFSI 수분량이 전지 성능에 부정적인 영향을 미치는 것을 구체적으로 확인하였다. 또한, PMPyr-TFSI 전해질 내의 브롬 이온 불순물 양 제어를 통하여, 전지 내에서 브롬 이온 불순물과 관련한 전기화학 부반응을 찾아 내었다. 이들 할로겐 불순물에 의한 초기 전지 쿨롱 효율저하는 눈에 띠었으나, 수명 저하에는 큰 변화가 없음을 확인하였다.

Keywords

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