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Issue 37, 2015
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A high energy density Li2S@C nanocomposite cathode with a nitrogen-doped carbon nanotube top current collector

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Abstract

Lithium sulfide (Li2S), with a high theoretical capacity of 1166 mA h g−1, is considered as one of the most promising cathode materials for the next-generation lithium-ion batteries. In this work, a novel cell configuration with a top current collector was designed for Li2S based batteries. The nitrogen-doped carbon nanotube (N-CNT) film was applied on top of the cathode, which serves not only as a top current collector but also as a barrier layer to effectively impede the polysulfide diffusion and enhance the utilization of active materials. A sheet-like Li2S@C nanocomposite was synthesized from low-cost and environmentally friendly raw materials of lithium sulfate (Li2SO4) and activated graphite. The as-prepared Li2S@C composites were directly used as cathode materials without adding any binder or carbon additive, which enabled a high Li2S loading up to 68% in the total cathode weight. The cells exhibited superior electrochemical performance. The specific energy at 0.5C was 804 W h kg−1 based on the total electrode weight including the N-CNT top current collector, which is among the highest values demonstrated so far for sulfur and Li2S cathodes.

Graphical abstract: A high energy density Li2S@C nanocomposite cathode with a nitrogen-doped carbon nanotube top current collector

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Publication details

The article was received on 28 Jul 2015, accepted on 07 Aug 2015 and first published on 07 Aug 2015


Article type: Paper
DOI: 10.1039/C5TA05819H
Citation: J. Mater. Chem. A, 2015,3, 18913-18919
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    A high energy density Li2S@C nanocomposite cathode with a nitrogen-doped carbon nanotube top current collector

    S. Zhang, M. Liu, F. Ma, F. Ye, H. Li, X. Zhang, Y. Hou, Y. Qiu, W. Li, J. Wang, J. Wang and Y. Zhang, J. Mater. Chem. A, 2015, 3, 18913
    DOI: 10.1039/C5TA05819H

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