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RISS 인기검색어
- 검색키워드
- 저자 : Guccini, Valentina (검색결과 2 건)
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Kim, Jong Min,Guccini, Valentina,Seong, Kwang-dong,Oh, Jiseop,Salazar-Alvarez, German,Piao, Yuanzhe Elsevier 2017 Carbon Vol.118 No.-
<P>Silicon is a good alternative to conventional graphite anode but it has bad cycling and rate performance. To overcome these severe problems, extensively interconnected silicon nanoparticles using carbon network derived from ultrathin cellulose nanofibers were synthesized. Ultrathin cellulose nanofibers, an abundant and sustainable material, entangle each silicon nanoparticle and become extensively interconnected carbon network after pyrolysis. This wide range interconnection provides an efficient electron path by decreasing the likelihood that electrons experience contact resistivity and also suppresses the volume expansion of silicon during lithiation. In addition, Ultrathin cellulose nanofibers are carboxylated and therefore adhesive to silicon nanoparticles through hydrogen bonding. This property makes ultrathin cellulose the perfect carbon source when making silicon composites. As a consequence, it exhibits 808 mAh g(-1) of the reversible capacity after 500 cycles at high current density of 2 A g(-1) with a coulombic efficiency of 99.8%. Even at high current density of 8 A g(-1), it shows a high reversible discharge capacity of 464 mAh g(-1). Moreover, extensively interconnected carbon network prevents the formation of a brittle electrode with a water-based binder. Therefore, this remarkable material has a huge potential for LIBs applications. (C) 2017 Elsevier Ltd. All rights reserved.</P>
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A novel textile-like carbon wrapping for high-performance silicon anodes in lithium-ion batteries
Kim, Jong Min,Guccini, Valentina,Kim, Dongwon,Oh, Jiseop,Park, Seungman,Jeon, Youngmoo,Hwang, Taejin,Salazar-Alvarez, German,Piao, Yuanzhe The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.26
<P>Carbon coating is essential for active materials in electrochemical applications that are often insulators or poor conductors. A conventional conformal carbon coating can hinder the ion diffusion to and from the active material and form an isolated conducting network. Especially, active materials with very large volume expansion, <I>e.g.</I>, silicon, can destroy the carbon coating during lithiation, which makes conformal carbon coating inappropriate. This paper presents a novel textile-like carbon wrapping that provides efficient electron and ion diffusion paths <I>via</I> a wide-range carbon network and pores. The textile-like carbon wrapping can reduce the electrical contact loss during cycling through the wide-range carbon network, which makes it a suitable carbon coating for materials that undergo volume expansion. A textile-like carbon-wrapped silicon is formed by pyrolysis of a dried suspension of silicon nanoparticles mixed with enzymatically hydrolyzed cellulose nanofibers. It shows excellent electrochemical performance compared to a conformal carbon-coated silicon. It exhibits a reversible specific capacity of 680 mA h g<SUP>−1</SUP> at 8.0 A g<SUP>−1</SUP> and shows excellent cycling stability (capacity retention of 94.5% after 500 cycles at 2.0 A g<SUP>−1</SUP>) with high Si content (95.71 wt%). Therefore, this novel textile-like carbon wrapping can be utilized in many electrochemical applications instead of the conventional carbon coating, especially for active materials that undergo large volume expansion.</P>
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