DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kwon, Joon | ko |
dc.contributor.author | Lee, Won Jun | ko |
dc.contributor.author | Kim, Sang Ouk | ko |
dc.date.accessioned | 2019-04-15T14:14:22Z | - |
dc.date.available | 2019-04-15T14:14:22Z | - |
dc.date.created | 2019-04-03 | - |
dc.date.created | 2019-04-03 | - |
dc.date.issued | 2019-03 | - |
dc.identifier.citation | JOURNAL OF PHYSICAL CHEMISTRY C, v.123, no.10, pp.6220 - 6228 | - |
dc.identifier.issn | 1932-7447 | - |
dc.identifier.uri | http://hdl.handle.net/10203/253977 | - |
dc.description.abstract | The end-cap removal of carbon nanotubes (CNTs) refers to the structural modification method that makes inner-core spaces and voids between walls accessible. Specifically, the accommodation of alkali metal cations in those hidden surfaces for electrochemical energy storage has been a challenging task. Here we present open-ended vertically aligned CNTs (VA-CNTs) as an ideal structure for Li+ accommodation, which were produced by chemical vapor deposition, followed by CF4 reactive ion etching. A model study suggests a link between Li+ capacity and the surface area, more specifically, allows us to estimate the amount of additional Li+ accommodation, which is 2.3 times increased after end-cap removal. The relatively high capacity (889 mAh/g) has confirmed that open-ended VA-CNTs are highly active for Li+ intercalation as well as exposing interior surfaces, which can be compared to the control (338 mAh/g). The microstructural change observation combined with spectroscopic studies reveals that poor Li+ reversibility stems from the solid-electrolyte interface (SEI) layer formation on the interior and exterior walls of the CNTs, which results in poor initial Coulombic efficiency (similar to 23.3%) and cyclic stability (48.6%) after SO cycles. The significant capacity fades after the first cycle due to the accelerated formation of the SEI layer in the presence of a heteroatom, which degrades Li+ and electron mobility. The exposed inner-core space provides significant increased surface area as expected, but confined inner-core space leads to poor reversibility with channel blockage. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Utilizing Hidden Surfaces: End-Cap Removal of Carbon Nanotubes for Improved Lithium Storage | - |
dc.type | Article | - |
dc.identifier.wosid | 000461537400045 | - |
dc.identifier.scopusid | 2-s2.0-85062457379 | - |
dc.type.rims | ART | - |
dc.citation.volume | 123 | - |
dc.citation.issue | 10 | - |
dc.citation.beginningpage | 6220 | - |
dc.citation.endingpage | 6228 | - |
dc.citation.publicationname | JOURNAL OF PHYSICAL CHEMISTRY C | - |
dc.identifier.doi | 10.1021/acs.jpcc.8b10567 | - |
dc.contributor.localauthor | Kim, Sang Ouk | - |
dc.contributor.nonIdAuthor | Kwon, Joon | - |
dc.contributor.nonIdAuthor | Lee, Won Jun | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | ENERGY | - |
dc.subject.keywordPlus | BATTERIES | - |
dc.subject.keywordPlus | INSERTION | - |
dc.subject.keywordPlus | ELECTRODES | - |
dc.subject.keywordPlus | PLASMA | - |
dc.subject.keywordPlus | GROWTH | - |
dc.subject.keywordPlus | ARRAYS | - |
dc.subject.keywordPlus | OXYGEN | - |
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