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dc.contributor.author선양국-
dc.date.accessioned2018-03-26T14:23:53Z-
dc.date.available2018-03-26T14:23:53Z-
dc.date.issued2014-12-
dc.identifier.citationCHEMSUSCHEM, 권: 7, 호: 12, 페이지: 3295-3303en_US
dc.identifier.issn1864-5631-
dc.identifier.issn1864-564X-
dc.identifier.urihttps://onlinelibrary.wiley.com/doi/full/10.1002/cssc.201402389-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/52732-
dc.description.abstractThe structure, electrochemistry, and thermal stability of concentration gradient core-shell (CGCS) particles with different shell morphologies were evaluated and compared. We modified the shell morphology from nanoparticles to nanorods, because nanorods can result in a reduced surface area of the shell such that the outer shell would have less contact with the corrosive electrolyte, resulting in improved electrochemical properties. Electron microscopy studies coupled with electron probe X-ray micro-analysis revealed the presence of a concentration gradient shell consisting of nanoparticles and nanorods before and after thermal lithiation at high temperature. Rietveld refinement of the X-ray diffraction data and the chemical analysis results showed no variations of the lattice parameters and chemical compositions of both produced CGCS particles except for the degree of cation mixing (or exchange) in Li and transition metal layers. As anticipated, the dense nanorods present in the shell gave rise to a high tap density (2.5 g cm(-3)) with a reduced pore volume and surface area. Intimate contact among the nanorods is likely to improve the resulting electric conductivity. As a result, the CGCS Li[Ni0.60Co0.15Mn0.25]O-2 with the nanorod shell retained approximately 85.5% of its initial capacity over 150 cycles in the range of 2.7-4.5 V at 60 degrees C. The charged electrode consisting of Li-0.16[Ni0.60Co0.15Mn0.25]O-2 CGCS particles with the nanorod shell also displayed a main exothermic reaction at 279.4 degrees C releasing 751.7 Jg(-1) of heat. Due to the presence of the nanorod shell in the CGCS particles, the electrochemical and thermal properties are substantially superior to those of the CGCS particles with the nanoparticle shell.en_US
dc.description.sponsorshipThis work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (2009-0092780). This work was also supported by the Human Resources Development program (20124010203290) through a Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.en_US
dc.language.isoenen_US
dc.publisherWILEY-V C H VERLAG GMBHen_US
dc.subjectbatteriesen_US
dc.subjectconcentration gradienten_US
dc.subjectcore-shellen_US
dc.subjectlithiumen_US
dc.subjectnanorodsen_US
dc.subjectpositive electrodeen_US
dc.subjectshellen_US
dc.titleNanorod and Nanoparticle Shells in Concentration Gradient Core-Shell Lithium Oxides for Rechargeable Lithium Batteriesen_US
dc.typeArticleen_US
dc.relation.no12-
dc.relation.volume7-
dc.identifier.doi10.1002/cssc.201402389-
dc.relation.page3295-3303-
dc.relation.journalCHEMSUSCHEM-
dc.contributor.googleauthorYoon, Sung-June-
dc.contributor.googleauthorMyung, Seung-Taek-
dc.contributor.googleauthorNoh, Hyung-Joo-
dc.contributor.googleauthorLu, Jun-
dc.contributor.googleauthorAmine, Khalil-
dc.contributor.googleauthorSun, Yang-Kook-
dc.relation.code2014027145-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDEPARTMENT OF ENERGY ENGINEERING-
dc.identifier.pidyksun-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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