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Issue 17, 2014
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Nanoporous Li2S and MWCNT-linked Li2S powder cathodes for lithium-sulfur and lithium-ion battery chemistries

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Abstract

In order to achieve high capacity utilization and high rate performance of lithium sulfide (Li2S) cathode materials, it is critical to identify scalable methods for low-cost preparation of nanostructured Li2S or Li2S-carbon composites. Here, we report on the preparation and characterization of nanoporous Li2S and multiwalled (MW) carbon nanotube (CNT) – linked Li2S powders, prepared for the first time via a versatile solution-based method. The addition of MWCNTs enhances electrical conductivity and structural stability of the Li2S-based cathodes and reduces polarization of cells operating at high current densities. The nanostructured Li2S-based cathodes containing 20 wt% MWCNT showed promising discharge capacities of up to ∼1050 mA h g−1S at a slow rate of C/20 and ∼800 mA h g−1S at a C/2 rate. Quite remarkably, without any electrolyte additives (such as polysulfides or lithium nitrate) MWCNT-linked Li2S cathodes demonstrated up to ∼90% capacity retention after 100 cycles in half cells (vs. Li foil) at a C/5 and C/10 rates.

Graphical abstract: Nanoporous Li2S and MWCNT-linked Li2S powder cathodes for lithium-sulfur and lithium-ion battery chemistries

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Publication details

The article was received on 16 Oct 2013, accepted on 11 Nov 2013 and first published on 12 Nov 2013


Article type: Communication
DOI: 10.1039/C3TA14161F
Citation: J. Mater. Chem. A, 2014,2, 6064-6070
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    Nanoporous Li2S and MWCNT-linked Li2S powder cathodes for lithium-sulfur and lithium-ion battery chemistries

    F. Wu, A. Magasinski and G. Yushin, J. Mater. Chem. A, 2014, 2, 6064
    DOI: 10.1039/C3TA14161F

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