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RISS 인기검색어
- 검색키워드
- 저자 : Tsiouvaras, N. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Understanding problems of lithiated anodes in lithium oxygen full-cells
Kwak, W. J.,Shin, H. J.,Reiter, J.,Tsiouvaras, N.,Hassoun, J.,Passerini, S.,Scrosati, B.,Sun, Y. K. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.27
<P>Lithium oxygen batteries are attractive battery systems which can provide high energy density for the next generation. However, even if many research studies have made progress for years, the studies about substitution of Li metal which has inherent limitations in terms of stability and long term cycling properties are terribly deficient. Herein, our group clearly demonstrates the ambiguous unsolved problems of lithium oxygen full-cells using an alternative anode for Li metal by XRD and SEM analysis. The amount of Li source in the alternative anode is limited compared to the quasi-infinite amount of Li source in Li metal. The returning lithium ions during charging form lithium hydroxide which passivates the anode by a side reaction with moisture in the electrolyte and from outside. This report will help to accelerate the development of lithium oxygen full-cells.</P>
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Low-Polarization Lithium-Oxygen Battery Using [DEME][TFSI] Ionic Liquid Electrolyte
Ulissi, Ulderico,Elia, Giuseppe Antonio,Jeong, Sangsik,Mueller, Franziska,Reiter, Jakub,Tsiouvaras, Nikolaos,Sun, Yang-Kook,Scrosati, Bruno,Passerini, Stefano,Hassoun, Jusef Wiley (John WileySons) 2018 ChemSusChem Vol.11 No.1
<P>The room-temperature molten salt mixture of N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethanesulfonyl) imide ([DEME][TFSI]) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is herein reported as electrolyte for application in Li-O-2 batteries. The [DEME][TFSI]-LiTFSI solution is studied in terms of ionic conductivity, viscosity, electrochemical stability, and compatibility with lithium metal at 30 degrees C, 40 degrees C, and 60 degrees C. The electrolyte shows suitable properties for application in Li-O-2 battery, allowing a reversible, low-polarization discharge-charge performance with a capacity of about 13Ahg in the positive electrode and coulombic efficiency approaching 100%. The reversibility of the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) is demonstrated by exsitu XRD and SEM studies. Furthermore, the study of the cycling behavior of the Li-O-2 cell using the [DEME][TFSI]-LiTFSI electrolyte at increasing temperatures (from 30 to 60 degrees C) evidences enhanced energy efficiency together with morphology changes of the deposited species at the working electrode. In addition, the use of carbon-coated Zn0.9Fe0.1O (TMO-C) lithium-conversion anode in an ionic-liquid-based Li-ion/oxygen configuration is preliminarily demonstrated.</P>
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An Advanced Lithium–Air Battery Exploiting an Ionic Liquid-Based Electrolyte
Elia, G. A.,Hassoun, J.,Kwak, W.-J.,Sun, Y.-K.,Scrosati, B.,Mueller, F.,Bresser, D.,Passerini, S.,Oberhumer, P.,Tsiouvaras, N.,Reiter, J. American Chemical Society 2014 NANO LETTERS Vol.14 No.11
<P>A novel lithium–oxygen battery exploiting PYR<SUB>14</SUB>TFSI–LiTFSI as ionic liquid-based electrolyte medium is reported. The Li/PYR<SUB>14</SUB>TFSI–LiTFSI/O<SUB>2</SUB> battery was fully characterized by electrochemical impedance spectroscopy, capacity-limited cycling, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The results of this extensive study demonstrate that this new Li/O<SUB>2</SUB> cell is characterized by a stable electrode–electrolyte interface and a highly reversible charge–discharge cycling behavior. Most remarkably, the charge process (oxygen oxidation reaction) is characterized by a very low overvoltage, enhancing the energy efficiency to 82%, thus, addressing one of the most critical issues preventing the practical application of lithium–oxygen batteries.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-11/nl5031985/production/images/medium/nl-2014-031985_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5031985'>ACS Electronic Supporting Info</A></P>
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