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    Hierarchical porous carbon by ultrasonic spray pyrolysis yields stable cycling in lithium-sulfur battery

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    Date
    2014-07
    Author
    Jung, Dae Soo
    Hwang, Tae Hoon
    Lee, Ji Hoon
    Koo, Hye Young
    Shakoor, Rana A.
    Kahraman, Ramazan
    Jo, Yong Nam
    Park, Min-Sik
    Choi, Jang Wook
    ...show more authors ...show less authors
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    Abstract
    Utilizing 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.
    DOI/handle
    http://dx.doi.org/10.1021/nl501383g
    http://hdl.handle.net/10576/4171
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    • Chemical Engineering [‎1249‎ items ]

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