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Issue 40, 2015
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A carbon sandwich electrode with graphene filling coated by N-doped porous carbon layers for lithium–sulfur batteries

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Abstract

A sheet-like carbon sandwich, which contains a graphene layer as the conductive filling with N-doped porous carbon layers uniformly coated on both sides, is designed as a novel sulfur reservoir for lithium–sulfur batteries and experimentally obtained by a hydrothermal process of a mixture of graphene oxide, glucose and pyrrole, followed by KOH activation. In the hydrothermal process, graphene oxide is both employed as the precursor for the central graphene filling and a sheet-like template for both-side formation of N-doped porous carbon layers, resulting in an N-doped carbon sandwich structure (N-CS). This carbon sandwich is about 50–70 nm in thickness and has a high specific surface area (∼2677 m2 g−1) and a large pore volume (∼1.8 cm3 g−1), making it a promising high capacity reservoir for sulfur and polysulfide in a lithium–sulfur cell. The sheet-like morphology and the interconnected pore structure of the N-CS, together with a nitrogen content of 2.2%, are transformed to the assembled N-CS/sulfur cell with a high rate performance and excellent cycling stability because of fast ion diffusion and electron transfer. At a 2C rate, the reversible capacity is up to 625 mA h g−1 and remains at 461 mA h g−1 after 200 cycles with only 0.13% capacity fading per cycle. More interestingly, the sheet-like structure helps the N-CS materials form a tightly stacked coating on an electrode sheet, guaranteeing a volumetric capacity as high as 350 mA h cm−3.

Graphical abstract: A carbon sandwich electrode with graphene filling coated by N-doped porous carbon layers for lithium–sulfur batteries

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Publication details

The article was received on 14 Jul 2015, accepted on 24 Aug 2015 and first published on 24 Aug 2015


Article type: Paper
DOI: 10.1039/C5TA05324B
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Citation: J. Mater. Chem. A, 2015,3, 20218-20224
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    A carbon sandwich electrode with graphene filling coated by N-doped porous carbon layers for lithium–sulfur batteries

    S. Niu, W. Lv, C. Zhang, F. Li, L. Tang, Y. He, B. Li, Q. Yang and F. Kang, J. Mater. Chem. A, 2015, 3, 20218
    DOI: 10.1039/C5TA05324B

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