Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 11, Pages 6046-6052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301688h
Keywords
rechargeable lithium-sulfur battery; nanocomposite; amphiphilic block copolymer; electrochemical performance; cyclability
Funding
- Seven One Limited
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A sulfur carbon nanocomposite consisting of a commercial high-surface-area carbon (i.e., Black Pearls 2000, BET surface area >1000 m(2) g(-1)) and sulfur has been synthesized by an in situ deposition method. The nanocomposite is in the form of agglomerated nanoparticles, with the micropores within the carbon filled with sulfur and the mesopores on the carbon surface almost completely covered by sulfur. The BET surface area of the nanocomposite containing a sulfur content of 63.5 wt % is significantly reduced to only 40 m(2) g(-1). Cathodes containing the nanocomposite and Pluronic F427 block copolymer, which partially replaces the polyvinylidene fluoride binder, were prepared and evaluated in lithium cells by cyclic voltammetry and galvanostatic cycling. The nanocomposite cathodes with the copolymer show improved electrochemical stability and cyclability. The Pluronic copolymer helps retain a uniform nanocomposite structure within the electrodes, improving the electrochemical contact, which was manifested by scanning electron microscopy and electrochemical impedance spectroscopy. The sulfur-Black Pearls nanocomposite with the Pluronic copolymer as an additive in the electrodes is promising for high-rate rechargeable lithium-sulfur batteries.
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