Journal
MATERIALS RESEARCH BULLETIN
Volume 48, Issue 6, Pages 2079-2083Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2013.02.031
Keywords
Oxides; Chemical synthesis; Electrochemical measurements; Electrochemical properties; Energy storage
Categories
Funding
- National Natural Science Foundation of China [21173198]
- Natural Science Foundation of Hubei Province, China [2010CDA017]
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Nano-sized sulfur particles exhibiting good adhesion with conducting acetylene black and alumina composite materials were synthesized by means of an evaporated solvent and a concentrated crystallization method for use as the cathodes of lithium-sulfur batteries. The composites were characterized and examined by X-ray diffraction, environmental scanning electron microscopy and electrochemical methods, such as cyclic voltammetry, electrical impedance spectroscopy and charge-discharge tests. Micron-sized flaky alumina was employed as an adsorbent for the cathode material. The initial discharge capacity of the cathode with the added alumina was 1171 mAh g(-1), and the remaining capacity was 585 mAh g(-1) after 50 cycles at 0.25 mA cm(-2). Compared with bare sulfur electrodes, the electrodes containing alumina showed an obviously superior cycle performance, confirming that alumina can contribute to reducing the dissolution of polysulfides into electrolytes during the sulfur charge-discharge process. (C) 2013 Elsevier Ltd. All rights reserved.
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