고전압 리튬이차전지를 위한 LiNi0.5Mn1.5O4 양극용전해질로써 상온 이온성 액체 전해질의 불순물 효과에 관한 연구
The Influence of Impurities in Room Temperature Ionic Liquid Electrolyte for Lithium Ion Batteries Containing High Potential Cathode
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초록
상온 이온성 액체인 propylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PMPyr- TFSI)를 리튬이차전지 전해질 용매로 사용 시 PMPyr-TFSI 내 수분 및 브롬 불순물이 전지의성능에 미치는 영향을 연구하였다. 고전압 양극 물질인 LiNi0.5Mn1.5O4 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.
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, LiNi0.5Mn1.5O4 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.
참고문헌 (19)
- Y. Baba, "Thermal stability of LixCoO 2 cathode for lithium ion battery", Solid State Ionics, 148, pp.311~ (2002)
- M. Egashira, "Charge-discharge and high temperature reaction of LiCoO 2 in ionic liquid electrolytes based on cyano-substituted quaternary ammonium cation", J. Power Sources, 160, pp.1387~ (2006)
- S. Li, "Diphenylamine: A safety electrolyte additive for reversible overcharge protection of 3.6V-class lithium ion batteries", J. Power Sources, 184, pp.553~ (2008)
- N. Alias, "Advances of aqueous rechargeable lithium-ion battery: A review", J. Power Sources, 274, pp.237~ (2015)
- K. Xu, "Nonaqueous Liquid Electrolytes for Lithium-Based Rechargeable Batteries", Chem. Rev, 104, pp.4303~ (2004)
- J. Zhang, "Artificial Interface Deriving from Sacrificial Tris(trimethylsilyl)phosphate Additive for Lithium Rich Cathode Materials", Electrochim. Acta, 117, pp.99~ (2014)
- P. Barpanda, "High-Voltage Pyrophosphate Cathodes", Adv. Energy Mater, 2, pp.841~ (2012)
- 차은희, "The Corrosion Study of Al Current Collector in Phosphonium Ionic Liquid as Solvent for Lithium Ion Battery", 전기화학회지, 14(3), pp.152~156 (2011), 한국전기화학회
- J. Mun, "Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO 2for advanced, safe lithium-ion batteries", Sci. Rep, 4, pp.5802~ (2014)
- 임태은, "Synthesis and Properties of Pyrrolidinium and Piperidinium Bis(trifluoromethanesulfonyl)imide Ionic Liquids with Allyl Substituents", Bulletin of the Korean Chemical Society, 28(9), pp.1567~1572 (2007), 대한화학회
- J. Mun, "Surface film formation on LiNi0.5Mn1.5O4electrode in an ionic liquid solvent at elevated temperature", J. Electrochem. Soc, 158, pp.A453~ (2011)
- J. Mun, "Electrochemical stability of bis(trifluoromethanesulfonyl)imide-based ionic liquids at elevated temperature as a solvent for a titanium oxide bronze electrode", J. Power Sources, 194, pp.1068~ (2009)
- E. Cho, "Corrosion", passivation of aluminum current collector in bis(fluorosulfonyl)imide-based ionic liquid for lithium-ion batteries, 2012, pp.22, 1~
- E. Markevich, "Behavior of Graphite Electrodes in Solutions Based on Ionic Liquids in In Situ Raman Studies", J. Electrochem. Soc, 155, pp.A132~ (2008)
- X. W. Gao, "LiNi0.5Mn1.5O4 spinel cathode using room temperature ionic liquid as electrolyte", Electrochim. Acta, 101, pp.151~ (2013)
- S. Seki, "Compatibility of N-Methyl-N-propylpyrrolidinium Cation Room-Temperature Ionic Liquid Electrolytes and Graphite Electrodes", J. Phys. Chem. C, 112, pp.16708~ (2008)
- Gwan-Hong Min, "Synthesis and Physicochemical Properties of Ionic Liquids: 1-Alkenyl-2,3-dimethylimidazolium Tetrafluoroborates", Bulletin of the Korean Chemical Society, 28(9), pp.1562~1566 (2007), 대한화학회
- J. Mun, "Comparative Study on Surface Films from Ionic Liquids Containing Saturated and Unsaturated Substituent for LiCoO 2", J. Electrochem. Soc, 157, pp.A136~ (2010)
- T. Yim, "Synthesis and Properties of Acyclic Ammonium-based Ionic Liquids with Allyl Substituents as Electrolytes", Molecules, 14, pp.1840~ (2009)