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Kim, J. K.,Scheers, J.,Ryu, H. S.,Ahn, J. H.,Nam, T. H.,Kim, K. W.,Ahn, H. J.,Cho, G. B.,Jacobsson, P. Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.6
We designed a novel layer-built rechargeable lithium ribbon-type battery intended for textile or cloth based applications. The ribbon-type battery, 2.4 mm (or 1 mm) wide and 10 cm long, is composed of a double layer LiFePO4 cathode and an amorphous silicon nanofilm. The double layer LiFePO4 and amorphous silicon electrodes were prepared using the doctor blade method and a vertical deposition technique, respectively. The structure and morphology of the LiFePO4 and the silicon thin film were characterized by Rietveld refinement, SEM and TEM. At room temperature the ribbon-type battery exhibited an initial discharge capacity of 166.4 and 132.7 mA h g (1) at 0.5 and 1 C-rate, respectively. A reasonably good cycling performance and high coulombic efficiency under the high current density of 1 C-rate could be obtained with the Si/LiFePO4 ribbon-type battery. Also, a high volumetric capacity of 336 mA h cm (3) at 0.5 C-rate was achieved, which makes the ribbon-type battery suitable for practical use.
김재광,임두현,Johan Scheers,Jagath Pitawala,Susanne Wilken,Patrik Johansson,안주현,Aleksandar Matic,Per Jacobsson 한국전기화학회 2011 한국전기화학회지 Vol.14 No.2
In this study we have investigated the Li-ion coordination, thermal behavior and electrochemical stability of N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (Py_14TFSI) with lithium bis(trifluoromethanesulfony)imide (LiTFSI) doping intended for use as electrolytes for lithium batteries. The ionic conductivity is reduced and glass transition temperature (T_g) increases with LiTFSI doping concentration. Also, the electrochemical stability increases with LiTFSI doping. A high LiTFSI doping could enhance the electrochemical stability of electrolytes for lithium batteries, whereas the decrease in the ionic conductivity limits the capacity of the battery.
Kim, Jae-Kwang,Lim, Du-Hyun,Scheers, Johan,Pitawala, Jagath,Wilken, Susanne,Johansson, Patrik,Ahn, Jou-Hyeon,Matic, Aleksandar,Jacobsson, Per The Korean Electrochemical Society 2011 한국전기화학회지 Vol.14 No.2
In this study we have investigated the Li-ion coordination, thermal behavior and electrochemical stability of N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide ($Py_{14}TFSI$) with lithium bis(trifluoromethanesulfony)imide (LiTFSI) doping intended for use as electrolytes for lithium batteries. The ionic conductivity is reduced and glass transition temperature ($T_g$) increases with LiTFSI doping concentration. Also, the electrochemical stability increases with LiTFSI doping. A high LiTFSI doping could enhance the electrochemical stability of electrolytes for lithium batteries, whereas the decrease in the ionic conductivity limits the capacity of the battery.
Kerner, Manfred,Lim, Du-Hyun,Jeschke, Steffen,Rydholm, Tomas,Ahn, Jou-Hyeon,Scheers, Johan Elsevier 2016 Journal of Power Sources Vol.332 No.-
<P><B>Abstract</B></P> <P>The overall safety of Li-ion batteries is compromised by the state-of-the-art electrolytes; the thermally unstable lithium salt, lithium hexafluorophosphate (LiPF<SUB>6</SUB>), and flammable carbonate solvent mixtures. The problem is best addressed by new electrolyte compositions with thermally robust salts in low flammability solvents. In this work we introduce electrolytes with either of two lithium nitrile salts, lithium 4,5-dicyano-1,2,3-triazolate (LiDCTA) or lithium 4,5-dicyano-2-trifluoromethylimidazolide (LiTDI), in solvent mixtures with high flashpoint adiponitrile (ADN), as the main component. With sulfolane (SL) and ethylene carbonate (EC) as co-solvents the liquid temperature range of the electrolytes are extended to lower temperatures without lowering the flashpoint, but at the expense of high viscosities and moderate ionic conductivities. The anodic stabilities of the electrolytes are sufficient for LiFePO<SUB>4</SUB> cathodes and can be charged/discharged for 20 cycles in Li/LiFePO<SUB>4</SUB> cells with coulombic efficiencies exceeding 99% at best. The excellent thermal stabilities of the electrolytes with the solvent combination ADN:SL are promising for future electrochemical investigations at elevated temperatures (> 60 °C) to compensate the moderate transport properties and rate capability. The electrolytes with EC as a co-solvent, however, release CO<SUB>2</SUB> by decomposition of EC in presence of a lithium salt, which potentially makes EC unsuitable for any application targeting higher operating temperatures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Solvents and salts with nitrile groups are combined into novel electrolytes. </LI> <LI> Sulfolane in adiponitrile provides thermally stable, high flashpoint electrolytes. </LI> <LI> LiDCTA and LiTDI electrolytes have high oxidation stability (4.5 V vs Li+/Li°). </LI> <LI> Ethylene carbonate is decomposed into CO2 in the presence of lithium salt. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Jae-Kwang,Manuel, James,Lee, Min-Ho,Scheers, Johan,Lim, Du-Hyun,Johansson, Patrik,Ahn, Jou-Hyeon,Matic, Aleksandar,Jacobsson, Per The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.30
<P>A thin flexible polypyrrole-lithium iron phosphate (PPy-LiFePO<SUB>4</SUB>) based cathode has been fabricated. A slurry containing carbon black, a binder and the active material prepared by direct polymerization of pyrrole on the surface of LiFePO<SUB>4</SUB> (LFP) was spread on an Al/carbon film substrate by the doctor blade method. Transmission electron micrographs reveal that PPy nanoparticles form a web like structure over the surface of LFP particles. After doping with lithium ions the PPy network becomes conducting. When evaluated as a cathode of 180 μm thickness together with a gel polymer electrolyte and a lithium anode, the charge–discharge performance reveals that the electrochemical properties of LFP are influenced to a considerable extent by the PPy. The cells show high initial discharge capacities of 135 and 110 mA h g<SUP>−1</SUP> for 0.041 (<I>C</I>/10) and 0.21 (<I>C</I>/2) mA cm<SUP>−2</SUP>, respectively, and high active material utilization. Furthermore the cells exhibit stable cycle properties even at 0.21 mA cm<SUP>−2</SUP> with a low capacity fade per cycle (∼0.3%).</P> <P>Graphic Abstract</P><P>The flexible polypyrrole-LiFePO<SUB>4</SUB> electrode was prepared on an aluminum/carbon substrate by a doctor blade method. The pyrrole was polymerized on the surface of LiFePO<SUB>4</SUB> and doped by an electrochemical reaction. The 180 μm PPy-LFP/aluminium/carbon cathode was fabricated with a polymer gel electrolyte for high flexibility thin batteries. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm30965c'> </P>
A Novel Series of Highly Potent Small Molecule Inhibitors of Rhinovirus Replication
Kim, Jinwoo,Jung, Yu Kyoung,Kim, Chonsaeng,Shin, Jin Soo,Scheers, Els,Lee, Joo-Youn,Han, Soo Bong,Lee, Chong-Kyo,Neyts, Johan,Ha, Jae-Du,Jung, Young-Sik American Chemical Society 2017 Journal of medicinal chemistry Vol.60 No.13
<P>Human rhinoviruses (hRVs) are the main causative pathogen for common colds and are associated with the exacerbation of asthma. The wide variety in hRV serotypes has complicated the development of rhinovirus replication inhibitors. In the current investigation, we developed a novel series of benzothiophene derivatives and their analogues (6-8) that potently inhibit the replication of both hRV-A and hRV-B strains. Compound 6g inhibited the replication of hRV-B14, A21, and A71, with respective EC50 values of 0.083, 0.078, and 0.015 mu M. The results of a time-of-addition study against hRV-B14 and hRV-A16 and resistant mutation analysis on hRV-B14 implied that 6g acts at the early stage of the viral replication process, interacting with viral capsid protein. A molecular docking study suggested that 6g has a capsid-binding mode similar to that of pleconaril. Finally, derivatives of 6 also displayed significant inhibition against poliovirus 3 (PV3) replication, implying their potential inhibitory activities against other enterovirus species.</P>
Fostering Revisers for the Korean Translation Market
Scheer, Carolyn 한국외국어대학교 통역번역연구소 2003 논문집 Vol.7 No.-
This paper was especially written with English-speaking revisers in mind, although it may be useful to translators and agencies who wish to foster well-qualified revisers. The main purpose of the article is to help novice revisers who have a limited understanding of the translation process to understand better its dynamics. This, in turn, will enhance their revision of translated texts.
Translators and Revisers : Toward More Collaboration
Scheer, Carolyn 한국국제회의통역학회 2003 통역과 번역 Vol.5 No.2
The prevailing wisdom dictates that a translator should work into his/her own language (L1). In Korea, however, the prevailing wisdom does not match the reality. With the demand for into-English translations burgeoning, Korea is faced with a problem: Because few English speakers take up Korean language studies, and even fewer go on to become translators, only a handful of foreigners are working in the K-E translation market, and those are mainly literary translators. To make matters worse, very few Korean-speaking translators can produce high-quality english texts independently. They must rely on native-speakers to check and revise their work. Given Korea's unique situation in which Koreans must translate Korean into English, the translator and reviewer should work as a collaborative team to produce high-quality English translations. The paper will review prior research, look at findings of the study and then establish a methodology that translators and revisers can follow to produce a quality L2 product.