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Lithium‐Sulfur Batteries: An Advanced Lithium‐Sulfur Battery (Adv. Funct. Mater. 8/2013)
Kim, Junghoon,Lee, Dong‐,Ju,Jung, Hun‐,Gi,Sun, Yang‐,Kook,Hassoun, Jusef,Scrosati, Bruno WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.8
<P>On page 1076, Yang‐Kook Sun, Jusef Hassoun, Bruno Scrosati, and co‐workers report and characterize a hard carbon spherules‐sulfur electrode that is prepared by impregnation of crystalline sulfur into the carbon spheres through melting and thermal treatment. This material demonstrates very high capacity and rate capability, and is therefore proposed as a new generation cathode to drive electric vehicles over a long range. </P>
Verrelli, Roberta,Scrosati, Bruno,Sun, Yang-Kook,Hassoun, Jusef American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.7
<P>We report in this work a copper-doped Li<SUB>0.85</SUB>Ni<SUB>0.46</SUB>Cu<SUB>0.1</SUB>Mn<SUB>1.49</SUB>O<SUB>4</SUB> spinel-structured compound prepared by an easy, two-steps coprecipitation and solid state process and used in a lithium-ion battery in combination with a CuO-based anode. We show that the spinel-type cathode adopts unique morphology, characterized by well-developed, crystalline and aggregated microparticles, that considerably reduces the occurrence of side reactions. This cathode material can operate in a lithium cell at voltages as high as 5.3 V without sign of electrolyte decomposition, delivering a capacity of about 100 mA h g<SUP>–1</SUP> with high retention and high Coulombic efficiency over prolonged cycling. The combination of the Li<SUB>0.85</SUB>Ni<SUB>0.46</SUB>Cu<SUB>0.1</SUB>Mn<SUB>1.49</SUB>O<SUB>4</SUB> cathode with a conversion-type, CuO–MCMB anode results in a new type of lithium ion battery characterized by a voltage value of 3.4 V, a stable capacity of 100 mA h g<SUP>–1</SUP> and a high Coulombic efficiency (exceeding 95%). Expected low cost, safety, and environmental compatibility are additional advantages of the lithium-ion cell reported here.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-7/am500499a/production/images/medium/am-2014-00499a_0008.gif'></P>
Sun, Yang‐,Kook,Lee, Min‐,Joon,Yoon, Chong S.,Hassoun, Jusef,Amine, Khalil,Scrosati, Bruno WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.9
<P>Y.‐K. Sun, C. S. Yoon, B. Scrosati and co‐workers report on page 1192 the role of an AlF3‐coating layer on Li‐enriched cathode materials, which not only improves electrochemical performances but also thermal stability. These improvements are attributed to the trans‐formation of the initial layer (Li<SUB>2</SUB>MnO<SUB>3</SUB>) to a spinel phase, induced by the Li chemical‐leaching effect of the AlF3 coating layer. The spinel phase transferred from the layer on the Li‐enriched electrodes is able to negate the previous shortcomings of these designs. </P>
Mixed Electrolytes of Organic Solvents and Ionic Liquid for Rechargeable Lithium-Ion Batteries
Ji-Ae Choi,Eun-Gi Shim,Bruno Scrosati,김동원 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
Mixed electrolytes formed by the combination of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (BMP-TFSI) ionic liquid and standard liquid electrolyte are prepared and characterized. Linear sweep voltammetry measurements demonstrate that these mixed systems exhibit a wide electrochemical stability window, allowing them to be suitable electrolyte for carbonaceous anode-based lithium-ion batteries. Lithium-ion cells composed of graphite anode and LiCoO2 cathode are assembled using the mixed electrolytes, and their cycling performances are evaluated. The cell containing proper content of BMP-TFSI shows good cycling performance comparable to that of a cell assembled with organic electrolyte. The presence of BMP-TFSI in the mixed electrolyte contributes to the reduction of the flammability of electrolyte solution and the improvement of the thermal stability of charged Li1-xCoO2 in the electrolyte solution.
Mixed Electrolytes of Organic Solvents and Ionic Liquid for Rechargeable Lithium-Ion Batteries
Choi, Ji-Ae,Shim, Eun-Gi,Scrosati, Bruno,Kim, Dong-Won Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
Mixed electrolytes formed by the combination of 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (BMP-TFSI) ionic liquid and standard liquid electrolyte are prepared and characterized. Linear sweep voltammetry measurements demonstrate that these mixed systems exhibit a wide electrochemical stability window, allowing them to be suitable electrolyte for carbonaceous anode-based lithium-ion batteries. Lithium-ion cells composed of graphite anode and $LiCoO_2$ cathode are assembled using the mixed electrolytes, and their cycling performances are evaluated. The cell containing proper content of BMP-TFSI shows good cycling performance comparable to that of a cell assembled with organic electrolyte. The presence of BMP-TFSI in the mixed electrolyte contributes to the reduction of the flammability of electrolyte solution and the improvement of the thermal stability of charged $Li_{1-x}CoO_2$ in the electrolyte solution.
Oh, Seung‐,Min,Myung, Seung‐,Taek,Park, Jin Bum,Scrosati, Bruno,Amine, Khalil,Sun, Yang‐,Kook WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.8
<P><B>Ein neuer Mantel</B>: LiMn<SUB>1−<I>x</I></SUB>Fe<SUB><I>x</I></SUB>PO<SUB>4</SUB>‐Materialien mit unterschiedlich dickem LiFePO<SUB>4</SUB>‐Mantel um eine LiMn<SUB>0.85</SUB>Fe<SUB>0.15</SUB>PO<SUB>4</SUB>‐Bulkphase wurden hergestellt. Physikalische Eigenschaften wie die Rütteldichte, die Porosität und die Morphologie wurden optimiert. Das im Mikrobereich doppelt strukturierte LiMn<SUB>0.85</SUB>Fe<SUB>0.15</SUB>PO<SUB>4</SUB>/LiFePO<SUB>4</SUB>‐Material (siehe Bild) ist ein idealer Kandidat für den Einsatz in wiederaufladbaren Lithiumbatterien.</P>
High‐Performance Carbon‐LiMnPO<sub>4</sub> Nanocomposite Cathode for Lithium Batteries
Oh, Seung‐,Min,Oh, Sung‐,Woo,Yoon, Chong‐,Seung,Scrosati, Bruno,Amine, Khalil,Sun, Yang‐,Kook WILEY‐VCH Verlag 2010 Advanced Functional Materials Vol.20 No.19
<P>A cathode material of an electrically conducting carbon-LiMnPO4 nanocomposite is synthesized by ultrasonic spray pyrolysis followed by ball milling. The effect of the carbon content on the physicochemical and electrochemical properties of this material is extensively studied. A LiMnPO4 electrode with 30 wt% acetylene black (AB) carbon exhibits an excellent rate capability and good cycle life in cell tests at 55 and 25 degrees C. This electrode delivers a discharge capacity of 158 mAh g(-1) at 1/20 C, 126 mAh g(-1) at 1 C, and 107 mAh g(-1) at 2 C rate, which are the highest capacities reported so far for this type of electrode. Transmission electron microscopy and Mn dissolution results confirm that the carbon particles surrounding the LiMnPO4 protect the electrode from H F attack, and thus lead to a reduction of the Mn dissolution that usually occurs with this electrode. The improved electrochemical properties of the C-LiMnPO4 electrode are also verified by electrochemical impedance spectroscopy.</P>