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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.
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>
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>
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>