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Issue 37, 2017
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Free-standing compact cathodes for high volumetric and gravimetric capacity Li–S batteries

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Abstract

Free-standing high performance Li–S battery cathodes are currently attracting significant research efforts. Loose macroporous structures have been proposed by many to improve sulfur utilization and areal capacity. However, their low cathode sulfur densities and high electrolyte fractions lead to low cell volumetric and gravimetric capacities. We report here a compact free-standing Li–S cathode structure that delivers areal, volumetric and gravimetric capacities all exceeding those of typical Li-ion batteries. The cathodes, formed by pressure filtration of the constituents, are composed of highly micro/mesoporous nitrogen-doped carbon nanospheres (NCNSs) embedded in the macropores of a multi-walled carbon nanotube (MWCNT) network to form a dense structure. The MWCNT network facilitates low cathode impedance. The NCNSs maximize sulfur utilization and immobilization. These collectively result in high cathode volumetric capacity (1106 mA h cm−3) and low electrolyte requirement (6 μL mg−1 of sulfur), which together lead to high cell-level gravimetric capacity. Stable long-term cycling at 0.3C (2.5 mA cm−2 for 5 mg cm−2 areal sulfur-loading) has also been achieved, with the areal and volumetric capacities of the best remaining above typical Li-ion values over 270 cycles and the per-cycle capacity fading being only 0.1%. The facile preparation means significant potential for large scale use.

Graphical abstract: Free-standing compact cathodes for high volumetric and gravimetric capacity Li–S batteries

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Publication details

The article was received on 01 Aug 2017, accepted on 24 Aug 2017 and first published on 25 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06781J
Citation: J. Mater. Chem. A, 2017,5, 19924-19933
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    Free-standing compact cathodes for high volumetric and gravimetric capacity Li–S batteries

    C. Hu, C. Kirk, J. Silvestre-Albero, F. Rodríguez-Reinoso and M. J. Biggs, J. Mater. Chem. A, 2017, 5, 19924
    DOI: 10.1039/C7TA06781J

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