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Issue 7, 2013
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Improved lithium–sulfur cells with a treated carbon paper interlayer

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Abstract

A simple, low-cost modification of lithium–sulfur (Li–S) cells by placing a treated carbon paper between the sulfur electrode and the separator has been investigated to significantly improve the performance of Li–S cells. The treated carbon paper was prepared by an alcohol-alkaline/thermal treatment of a commercial Toray carbon paper, introducing hydroxyl functional groups and micro-cracks on the carbon fibers in the carbon paper, which enhances the hydrophilicity and increases surface areas of the carbon paper matrix. The modified Li–S cells deliver a higher initial capacity of 1651 mAh g−1 at 1.5–2.8 V at a rate of C/5 compared to the cells without any interlayer or with an untreated carbon paper interlayer. The cells with the treated carbon paper offer additional improvement in performance when the discharge cut-off voltage is raised to 1.8 V: 1057, 1002, and 929 mAh g−1 after 100 cycles, respectively, at C/5, C/2, and 1 C rates. The improved cell performance is attributed to the 3D architecture of the carbon paper interlayer, serving as a conductive skeleton for trapping and depositing dissolved sulfur-containing active materials, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The novel configuration presented here offers a low-cost approach to overcome the persistent problems of Li–S cells.

Graphical abstract: Improved lithium–sulfur cells with a treated carbon paper interlayer

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Publication details

The article was received on 26 Sep 2012, accepted on 07 Dec 2012 and first published on 07 Dec 2012


Article type: Paper
DOI: 10.1039/C2CP43394J
Citation: Phys. Chem. Chem. Phys., 2013,15, 2291-2297
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    Improved lithium–sulfur cells with a treated carbon paper interlayer

    C. Zu, Y. Su, Y. Fu and A. Manthiram, Phys. Chem. Chem. Phys., 2013, 15, 2291
    DOI: 10.1039/C2CP43394J

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