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AuthorJung, Dae Soo
AuthorHwang, Tae Hoon
AuthorLee, Ji Hoon
AuthorKoo, Hye Young
AuthorShakoor, Rana A.
AuthorKahraman, Ramazan
AuthorJo, Yong Nam
AuthorPark, Min-Sik
AuthorChoi, Jang Wook
Available date2016-02-22T09:04:53Z
Publication Date2014-07
Publication NameNano Letters
ResourceScopus
CitationJung, D.S., Hwang, T.H., Lee, J.H., Koo, H.Y., Shakoor, R.A., Kahraman, R., Jo, Y.N., Park, M.-S., Choi, J.W. "Hierarchical porous carbon by ultrasonic spray pyrolysis yields stable cycling in lithium-sulfur battery", (2014) Nano Letters, 14 (8), pp. 4418-4425.
ISSN1530-6984
URIhttp://dx.doi.org/10.1021/nl501383g
URIhttp://hdl.handle.net/10576/4171
AbstractUtilizing the unparalleled theoretical capacity of sulfur reaching 1675 mAh/g, lithium-sulfur (Li-S) batteries have been counted as promising enablers of future lithium ion battery (LIB) applications requiring high energy densities. Nevertheless, most sulfur electrodes suffer from insufficient cycle lives originating from dissolution of lithium polysulfides. As a fundamental solution to this chronic shortcoming, herein, we introduce a hierarchical porous carbon structure in which meso- and macropores are surrounded by outer micropores. Sulfur was infiltrated mainly into the inner meso- and macropores, while the outer micropores remained empty, thus serving as a "barricade" against outward dissolution of long-chain lithium polysulfides. On the basis of this systematic design, the sulfur electrode delivered 1412 mAh/gsulfur with excellent capacity retention of 77% after 500 cycles. Also, a control study suggests that even when sulfur is loaded into the outer micropores, the robust cycling performance is preserved by engaging small sulfur crystal structures (S2-4). Furthermore, the hierarchical porous carbon was produced in ultrahigh speed by scalable spray pyrolysis. Each porous carbon particle was synthesized through 5 s of carrier gas flow in a reaction tube.
SponsorNational Research Foundation of Korea (NRF) Grant funded by the Korea government (MEST) (NRF-2010-C1AAA001-0029031, NRF-2012-R1A2A1A01011970, and NRF-2014R1A4A1003712) and the Qatar National Research Fund (NPRP Grant 5-569-2-232)
Languageen
PublisherAmerican Chemical Society
SubjectBimodal porous carbon
hierarchical porous carbon
lithium-sulfur battery
small sulfur
spray pyrolysis
TitleHierarchical porous carbon by ultrasonic spray pyrolysis yields stable cycling in lithium-sulfur battery
TypeArticle
Pagination4418-4425
Issue Number8
Volume Number14
dc.accessType Abstract Only


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