Ternary sulfur/polyacrylonitrile/Mg0.6Ni0.4O composite cathodes for high performance lithium/sulfur batteries
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Date
2013-01
Authors
Zhang, Yongguang
Zhao, Yan
Yermukhambetova, Assiya
Bakenov, Zhumabay
Chen, P.
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of materials chemistry., http://www.researchgate.net/publication/235654118
Abstract
Nanostructured magnesium nickel oxide (Mg0.6Ni0.4O) was synthesized by a self-propagating high
temperature synthesis method followed by heat treatment. The particles of the resulting oxide were
used as additives to prepare the sulfur/polyacrylonitrile/Mg0.6Ni0.4O (S/PAN/Mg0.6Ni0.4O) composite via
wet ballmilling. The SEM observation revealed that the composite morphology was drastically changed
by the addition of Mg0.6Ni0.4O, from smooth bulky particles of S/PAN to rough nanostructured
agglomerates with two times the increase in the specific surface area, favouring the reactivity of the
composite, and a homogeneous component distribution. Cyclic voltammetry, discharge–charge tests and
ac impedance spectroscopy have shown improved conductivity and electrochemical properties of the
composite by the addition of Mg0.6Ni0.4O, leading to high sulfur utilization and interfacial stabilization
in a Li/S cell upon discharge–charge cycling. The cell demonstrated enhanced reversibility, resulting in a
discharge capacity of about 1223 mA h g 1 at the second cycle and retained about 100% of this value
over 100 cycles. Furthermore, the S/PAN/Mg0.6Ni0.4O composite cathode exhibited a good rate
capability with discharge capacities of 887, 710 and 445 mA h g 1 at 0.5, 0.7 and 1 C, respectively.
Description
Keywords
ternary sulfur, polyacrylonitrile, composite cathodes, high performance lithium, sulfur batteries
Citation
Zhang Yongguang., Zhao Yan., Yermukhambetova Assiya., Bakenov Zhumabay., Chen P., 2013, Ternary sulfur/polyacrylonitrile/Mg0.6Ni0.4O composite cathodes for high performance lithium/sulfur batteries, DOI: 10.1039/c2ta00105e