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Oleshko, Vladimir P.,Kim, Jenny,Schaefer, Jennifer L.,Hudson, Steven D.,Soles, Christopher L.,Simmonds, Adam G.,Griebel, Jared J.,Glass, Richard S.,Char, Kookheon,Pyun, Jeffrey Cambridge University Press (Materials Research Soc 2015 MRS Communications Vol.5 No.3
<▼1><B>Abstract</B><P/></▼1><▼2><P>Poly[sulfur-random-1,3-diisopropenylbenzene (DIB)] copolymers synthesized via inverse vulcanization form electrochemically active polymers used as cathodes for high-energy density Li-S batteries, capable of enhanced capacity retention (1005 mAh/g at 100 cycles) and lifetimes of over 500 cycles. In this prospective, we demonstrate how analytical electron microscopy can be employed as a powerful tool to explore the origins of the enhanced capacity retention. We analyze morphological and compositional features when the copolymers, with DIB contents up to 50% by mass, are blended with carbon nanoparticles. Replacing the elemental sulfur with the copolymers improves the compatibility and interfacial contact between active sulfur compounds and conductive carbons. There also appears to be improvements of the cathode mechanical stability that leads to less cracking but preserving porosity. This compatibilization scheme through stabilized organosulfur copolymers represents an alternative strategy to the nanoscale encapsulation schemes which are often used to improve the cycle life in high-energy density Li-S batteries.</P></▼2>
Dirlam, Philip T.,Park, Jungjin,Simmonds, Adam G.,Domanik, Kenneth,Arrington, Clay B.,Schaefer, Jennifer L.,Oleshko, Vladimir P.,Kleine, Tristan S.,Char, Kookheon,Glass, Richard S.,Soles, Christopher American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.21
<P>The practical implementation of Li-S technology has been hindered by short cycle life and poor rate capability owing to deleterious effects resulting from the varied solubilities of different Li polysulfide redox products. Here, we report the preparation and utilization of composites with a sulfur-rich matrix and molybdenum disulfide (MoS2) particulate inclusions as Li-S cathode materials with the capability to mitigate the dissolution of the Li polysulfide redox products via the MoS2 inclusions acting as 'polysulfide anchors'. In situ composite formation was completed via a facile, one-pot method with commercially available starting materials. The composites were afforded by first dispersing MoS2 directly in liquid elemental sulfur (S-8) with sequential polymerization of the sulfur phase via thermal ring opening polymerization or copolymerization via inverse vulcanization. For the practical utility of this system to be highlighted, it was demonstrated, that the composite formation methodology was amenable to larger scale processes with composites easily prepared in 100 g batches. Cathodes fabricated with the high sulfur content composites as the active material afforded Li-S cells that exhibited extended cycle lifetimes of up to 1000 cycles with low capacity decay (0.07% per cycle) and demonstrated exceptional rate capability with the delivery of reversible capacity up to 500 mAh/g at 5 C.</P>
Lee, Sung-Il,Schö,mer, Martina,Peng, Huagen,Page, Kirt A.,Wilms, Daniel,Frey, Holger,Soles, Christopher L.,Yoon, Do Y. American Chemical Society 2011 Chemistry of materials Vol.23 No.11
<P>Poly(ethylene oxide)s with varying degrees of hyperbranching are effective at preventing the crystallization of PEO and lead to approximately a 100-fold increase in the Li-ion conductivity below 50 °C as compared with linear PEO. The Li-ion conductivities, which increase further upon permethylation of the hydroxyl termini, are found to correlate quantitatively with the fast segmental dynamics of PEO as measured by inelastic neutron scattering.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2011/cmatex.2011.23.issue-11/cm103696g/production/images/medium/cm-2010-03696g_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm103696g'>ACS Electronic Supporting Info</A></P>
Self-Sealing of Nanoporous Low Dielectric Constant Patterns Fabricated by Nanoimprint Lithography
Ro, Hyun Wook,Peng, Huagen,Niihara, Ken-ichi,Lee, Hae-Jeong,Lin, Eric K.,Karim, Alamgir,Gidley, David W.,Jinnai, Hiroshi,Yoon, Do Y.,Soles, Christopher L. WILEY-VCH Verlag 2008 ADVANCED MATERIALS Vol.20 No.10
<B>Graphic Abstract</B> <P>The cross-sectional TEM image shows that line-space patterns can be directly imprinted, with high fidelity, into highly porous spin-on organosilicate materials. This publication quantifies how the porosity and distribution of pores within the patterns are affected by the nanoimprint lithography processes, including evidence for a densified pattern surface. <img src='wiley_img/09359648-2008-20-10-ADMA200701994-content.gif' alt='wiley_img/09359648-2008-20-10-ADMA200701994-content'> </P>