Improved lithium–sulfur cells with a treated carbon paper interlayer
- 1 January 2013
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 15 (7), 2291-2297
- https://doi.org/10.1039/c2cp43394j
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.Keywords
This publication has 35 references indexed in Scilit:
- Positive Electrode Materials for Li-Ion and Li-BatteriesChemistry of Materials, 2010
- A highly ordered nanostructured carbon–sulphur cathode for lithium–sulphur batteriesNature Materials, 2009
- Li/S fundamental chemistry and application to high-performance rechargeable batteriesSolid State Ionics, 2004
- Polysulfide Shuttle Study in the Li/S Battery SystemJournal of the Electrochemical Society, 2004
- Effects of Nanosized Adsorbing Material on Electrochemical Properties of Sulfur Cathodes for Li/S Secondary BatteriesJournal of the Electrochemical Society, 2004
- The Lithium/Sulfur Rechargeable CellJournal of the Electrochemical Society, 2002
- A Solid Sulfur Cathode for Aqueous BatteriesScience, 1993
- Lithium Sulfur Battery: Oxidation/Reduction Mechanisms of Polysulfides in THF SolutionsJournal of the Electrochemical Society, 1988
- The electrochemical behavior of polysulfides in tetrahydrofuranJournal of Power Sources, 1985
- A Lithium/Dissolved Sulfur Battery with an Organic ElectrolyteJournal of the Electrochemical Society, 1979