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임태은,Hyun Yeong Lee,Hyo-Jin Kim,Junyoung Mun,Sangmi Kim,오승모,김영규 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.9
New pyrrolidinium and piperidinium bis(trifluoromethanesulfonyl)imide (TFSI) ionic liquids (ILs) having allyl substituents were synthesized and characterized. All of them are liquid at room temperature and stable up to 300 oC. The pyrrolidinium-based ILs showed better conductivities and lower viscosities than the corresponding piperidinium-based ILs. Among them, 1-allyl-1-methylpyrrolidinium TFSI showed the lowest viscosity of 52 cP, the highest conductivity of 5.7 mS cm-1, and the most negative cathodic voltage window of -3.2 V (vs. Fc/Fc+) on a platinum electrode, which are the improved results compared to the corresponding analogue having a saturated substituent, 1-methyl-1-propylpyrrolidinium TFSI.
Electrolyte additive to improve electrochemical aspect of cathode material for lithium-ion batteries
임태은 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Over-lithiated oxides (OLOs) are one of perspective cathode material, however, they have critical limitations to employ in LIBs owing to its intrinsic chemical and electrochemical properties. In this work, I would like to present to enhance electrochemical performances of OLOs materials based on employing organic functional additive, tris(trimethylsilyl) phosphite (TMSP). First, TMSP can decrease internal pressure as it scavenges oxygen gas by chemical conversion reaction. Second, TMSP also reduces nucleophilic character of lithium oxides as it chemically reacts with lithium oxides. Third, TMSP greatly enhances interfacial stability on OLOs electrode as it provides an effective solid electrolyte interphases (SEI) layer. Finally, TMSP considerably reduces dissolution of transition metal components in OLOs electrode as it selectively scavenges fluoride anion (F<sup>-</sup>). Consequently, the cell employed with TMSP shows a remarkable electrochemical performances for 100 cycles.
소수력 발전용 횡류수차의 최적설계를 위한 유동장 수치해석
임태은 ( Tae Eun Lim ),이계복 ( Kye Bock Lee ),정규원 ( Kyu Won Jeong ) 충북대학교 산업과학기술연구소 2010 산업과학기술연구 논문집 Vol.24 No.2
The CFD code is commonly used in many fields to reduce the cost and time of designing a product. Hydro-power attracts increasing attention in point of the effective use of water resources and it occupied as the circular energy system. The numerical study was conducted to find the optimal design of a cross flow turbine. In this paper several simple models were designed from the inlet nozzle to the outlet nozzle for numerical analysis of small sized cross flow turbine. For the analysis the Gambit was used and each model was composed of approximately 130,000 non-uniform grids. Solutions are conducted for the velocity distribution, velocity magnitude, internal flow, hydraulic characteristics for the cross flow turbine.