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Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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Highly improved rate capability for a lithium-ion battery nano-Li 4Ti 5O 12 negative electrode via carbon-coated mesoporous uniform pores with a simple self-assembly method

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dc.contributor.author Kang, Eunae ko
dc.contributor.author Jung, Yoon Seok ko
dc.contributor.author Kim, Gi-Heon ko
dc.contributor.author Chun, Jinyoung ko
dc.contributor.author Wiesner, Ulrich ko
dc.contributor.author Dillon, Anne C. ko
dc.contributor.author Kim, Jin Kon ko
dc.contributor.author Lee, Jinwoo ko
dc.date.available 2014-04-10T01:58:22Z -
dc.date.created 2013-07-05 ko
dc.date.issued 2011-11 -
dc.identifier.citation ADVANCED FUNCTIONAL MATERIALS, v.21, no.22, pp.4349 - 4357 ko
dc.identifier.issn 1616-301X ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/3528 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=81555229442 ko
dc.description.abstract A mesostructured spinel Li4Ti5O12 (LTO)-carbon nanocomposite (denoted as Meso-LTO-C) with large (>15 nm) and uniform pores is simply synthesized via block copolymer self-assembly. Exceptionally high rate capability is then demonstrated for Li-ion battery (LIB) negative electrodes. Polyisoprene-block-poly(ethylene oxide) (PI-b-PEO) with a sp2-hybridized carbon-containing hydrophobic block is employed as a structure-directing agent. Then the assembled composite material is crystallized at 700 degrees C enabling conversion to the spinel LTO structure without loss of structural integrity. Part of the PI is converted to a conductive carbon that coats the pores of the Meso-LTO-C. The in situ pyrolyzed carbon not only maintains the porous mesostructure as the LTO is crystallized, but also improves the electronic conductivity. A Meso-LTO-C/Li cell then cycles stably at 10 C-rate, corresponding to only 6 min for complete charge and discharge, with a reversible capacity of 115 mA h g-1 with 90% capacity retention after 500 cycles. In sharp contrast, a Bulk-LTO/Li cell exhibits only 69 mA h g-1 at 10 C-rate. Electrochemical impedance spectroscopy (EIS) with symmetric LTO/LTO cells prepared from Bulk-LTO and Meso-LTO-C cycled in different potential ranges reveals the factors contributing to the vast difference between the rate-capabilities. The carbon-coated mesoporous structure enables highly improved electronic conductivity and significantly reduced charge transfer resistance, and a much smaller overall resistance is observed compared to Bulk-LTO. Also, the solid electrolyte interphase (SEI)-free surface due to the limited voltage window (>1 V versus Li/Li+) contributes to dramatically reduced resistance. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher WILEY-V C H VERLAG GMBH ko
dc.subject Block copolymer self-assembly ko
dc.subject Capacity retention ko
dc.subject Carbon nanocomposite ko
dc.subject Charge and discharge ko
dc.subject Charge transfer resistance ko
dc.subject Conductive carbon ko
dc.subject Electronic conductivity ko
dc.subject Ethylene oxides ko
dc.subject Free surfaces ko
dc.subject High rate capability ko
dc.subject Hydrophobic blocks ko
dc.subject In-situ ko
dc.subject Li-ion batteries ko
dc.subject Lithium-ion battery ko
dc.subject Mesoporous ko
dc.subject Mesoporous structures ko
dc.subject Mesostructured ko
dc.subject Mesostructures ko
dc.subject Negative electrode ko
dc.subject Potential range ko
dc.subject Pyrolyzed carbon ko
dc.subject Rate capabilities ko
dc.subject Reversible capacity ko
dc.subject Self-assembly method ko
dc.subject Sharp contrast ko
dc.subject Solid electrolyte interphase ko
dc.subject Structure directing agents ko
dc.subject Uniform pore ko
dc.subject Voltage window ko
dc.title Highly improved rate capability for a lithium-ion battery nano-Li 4Ti 5O 12 negative electrode via carbon-coated mesoporous uniform pores with a simple self-assembly method ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-81555229442 ko
dc.identifier.wosid 000297097900019 ko
dc.type.rims ART ko
dc.description.scopustc 77 *
dc.date.scptcdate 2014-07-12 *
dc.identifier.doi 10.1002/adfm.201101123 ko
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