Volumetric discharge capacity 1 a h cm -3 realized by sulfur in carbon nanotube sponge cathodes

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    To make lithium-sulfur batteries competitive with commercialized lithium-ion batteries, sulfur cathodes need to be of high sulfur content, thick, and dense. We use 35 μm-thick, spongelike free-standing papers of carbon nanotubes (CNTs) as three-dimensional conductive matrices and simply capture sulfur in them by sublimation without using any binder. Because of good wettability of sulfur on the CNT surface and careful control of the temperature difference between the sulfur source and the CNT paper, sulfur is deposited uniformly on the CNT paper at controllable contents of 20-80 mass %. The 23 μm-thick, 1.5 g cm -3 -dense electrode with 70 mass % sulfur showed a breakthrough volumetric discharge capacity of 1100 mA h cm -3 with good gravimetric and areal discharge capacities of 1100 mA h g sulfur -1 , 763 mA h g electrode -1 , and 2.67 mA h cm -2 at the eighth cycle. Furthermore, the electrode retained the very high discharge capacity of 990 mA h cm -3 after 100 cycles. Such high performance is realized by employing our submillimeter-long, 99 mass %-pure, few-wall CNTs with careful control over the sulfur deposition process. Simple is the best; sulfur in the CNT sponge architecture minimizes additives and maximizes sulfur content and is promising to realize sulfur cathodes with practically high values for any of gravimetric, areal, and volumetric capacities.

    Original languageEnglish
    Pages (from-to)3951-3958
    Number of pages8
    JournalJournal of Physical Chemistry C
    Volume123
    Issue number7
    DOIs
    Publication statusPublished - 2019 Feb 21

    Fingerprint

    Carbon Nanotubes
    Sulfur
    Carbon nanotubes
    Cathodes
    sulfur
    cathodes
    carbon nanotubes
    Electrodes
    electrodes
    lithium sulfur batteries
    cycles
    Sublimation
    wettability
    sublimation
    Binders
    Wetting
    electric batteries
    temperature gradients
    lithium

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Energy(all)
    • Physical and Theoretical Chemistry
    • Surfaces, Coatings and Films

    Cite this

    Volumetric discharge capacity 1 a h cm -3 realized by sulfur in carbon nanotube sponge cathodes . / Hori, Keisuke; Hasegawa, Kei; Momma, Toshiyuki; Noda, Suguru.

    In: Journal of Physical Chemistry C, Vol. 123, No. 7, 21.02.2019, p. 3951-3958.

    Research output: Contribution to journalArticle

    @article{3f2289b79aec42ffa8bcda40ade9718e,
    title = "Volumetric discharge capacity 1 a h cm -3 realized by sulfur in carbon nanotube sponge cathodes",
    abstract = "To make lithium-sulfur batteries competitive with commercialized lithium-ion batteries, sulfur cathodes need to be of high sulfur content, thick, and dense. We use 35 μm-thick, spongelike free-standing papers of carbon nanotubes (CNTs) as three-dimensional conductive matrices and simply capture sulfur in them by sublimation without using any binder. Because of good wettability of sulfur on the CNT surface and careful control of the temperature difference between the sulfur source and the CNT paper, sulfur is deposited uniformly on the CNT paper at controllable contents of 20-80 mass {\%}. The 23 μm-thick, 1.5 g cm -3 -dense electrode with 70 mass {\%} sulfur showed a breakthrough volumetric discharge capacity of 1100 mA h cm -3 with good gravimetric and areal discharge capacities of 1100 mA h g sulfur -1 , 763 mA h g electrode -1 , and 2.67 mA h cm -2 at the eighth cycle. Furthermore, the electrode retained the very high discharge capacity of 990 mA h cm -3 after 100 cycles. Such high performance is realized by employing our submillimeter-long, 99 mass {\%}-pure, few-wall CNTs with careful control over the sulfur deposition process. Simple is the best; sulfur in the CNT sponge architecture minimizes additives and maximizes sulfur content and is promising to realize sulfur cathodes with practically high values for any of gravimetric, areal, and volumetric capacities.",
    author = "Keisuke Hori and Kei Hasegawa and Toshiyuki Momma and Suguru Noda",
    year = "2019",
    month = "2",
    day = "21",
    doi = "10.1021/acs.jpcc.8b10009",
    language = "English",
    volume = "123",
    pages = "3951--3958",
    journal = "Journal of Physical Chemistry C",
    issn = "1932-7447",
    publisher = "American Chemical Society",
    number = "7",

    }

    TY - JOUR

    T1 - Volumetric discharge capacity 1 a h cm -3 realized by sulfur in carbon nanotube sponge cathodes

    AU - Hori, Keisuke

    AU - Hasegawa, Kei

    AU - Momma, Toshiyuki

    AU - Noda, Suguru

    PY - 2019/2/21

    Y1 - 2019/2/21

    N2 - To make lithium-sulfur batteries competitive with commercialized lithium-ion batteries, sulfur cathodes need to be of high sulfur content, thick, and dense. We use 35 μm-thick, spongelike free-standing papers of carbon nanotubes (CNTs) as three-dimensional conductive matrices and simply capture sulfur in them by sublimation without using any binder. Because of good wettability of sulfur on the CNT surface and careful control of the temperature difference between the sulfur source and the CNT paper, sulfur is deposited uniformly on the CNT paper at controllable contents of 20-80 mass %. The 23 μm-thick, 1.5 g cm -3 -dense electrode with 70 mass % sulfur showed a breakthrough volumetric discharge capacity of 1100 mA h cm -3 with good gravimetric and areal discharge capacities of 1100 mA h g sulfur -1 , 763 mA h g electrode -1 , and 2.67 mA h cm -2 at the eighth cycle. Furthermore, the electrode retained the very high discharge capacity of 990 mA h cm -3 after 100 cycles. Such high performance is realized by employing our submillimeter-long, 99 mass %-pure, few-wall CNTs with careful control over the sulfur deposition process. Simple is the best; sulfur in the CNT sponge architecture minimizes additives and maximizes sulfur content and is promising to realize sulfur cathodes with practically high values for any of gravimetric, areal, and volumetric capacities.

    AB - To make lithium-sulfur batteries competitive with commercialized lithium-ion batteries, sulfur cathodes need to be of high sulfur content, thick, and dense. We use 35 μm-thick, spongelike free-standing papers of carbon nanotubes (CNTs) as three-dimensional conductive matrices and simply capture sulfur in them by sublimation without using any binder. Because of good wettability of sulfur on the CNT surface and careful control of the temperature difference between the sulfur source and the CNT paper, sulfur is deposited uniformly on the CNT paper at controllable contents of 20-80 mass %. The 23 μm-thick, 1.5 g cm -3 -dense electrode with 70 mass % sulfur showed a breakthrough volumetric discharge capacity of 1100 mA h cm -3 with good gravimetric and areal discharge capacities of 1100 mA h g sulfur -1 , 763 mA h g electrode -1 , and 2.67 mA h cm -2 at the eighth cycle. Furthermore, the electrode retained the very high discharge capacity of 990 mA h cm -3 after 100 cycles. Such high performance is realized by employing our submillimeter-long, 99 mass %-pure, few-wall CNTs with careful control over the sulfur deposition process. Simple is the best; sulfur in the CNT sponge architecture minimizes additives and maximizes sulfur content and is promising to realize sulfur cathodes with practically high values for any of gravimetric, areal, and volumetric capacities.

    UR - http://www.scopus.com/inward/record.url?scp=85061553045&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85061553045&partnerID=8YFLogxK

    U2 - 10.1021/acs.jpcc.8b10009

    DO - 10.1021/acs.jpcc.8b10009

    M3 - Article

    VL - 123

    SP - 3951

    EP - 3958

    JO - Journal of Physical Chemistry C

    JF - Journal of Physical Chemistry C

    SN - 1932-7447

    IS - 7

    ER -