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Issue 15, 2018
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Li2S/carbon nanocomposite strips from a low-temperature conversion of Li2SO4 as high-performance lithium–sulfur cathodes

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Abstract

The carbothermal conversion of Li2SO4 provides a cost-effective strategy to fabricate high-capacity Li2S cathodes; however, Li2S cathodes derived from Li2SO4 at high temperatures (>800 °C), having high crystallinity and large crystal size, result in a low utilization of Li2S. Here, we report Li2SO4/poly(vinyl alcohol)-derived Li2S/carbon nanocomposite (Li2S@C) strips at a record low temperature of 635 °C. These Li2S@C nanocomposite strips as a cathode show a low initial activation potential (2.63 V), a high initial discharge capacity (805 mA h g−1 Li2S) and a high cycling stability (0.2C and 1C). These improved results could be ascribed to the nano-sized Li2S particles as well as their low crystallinity due to the PVA-induced carbon network and the low conversion temperature, respectively. An XPS analysis reveals that the C[double bond, length as m-dash]C and C[double bond, length as m-dash]O bonds derived from the carbonization of PVA can promote the conversion of Li2SO4 at such a low temperature.

Graphical abstract: Li2S/carbon nanocomposite strips from a low-temperature conversion of Li2SO4 as high-performance lithium–sulfur cathodes

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Supplementary files

Article information


Submitted
16 Jan 2018
Accepted
12 Mar 2018
First published
12 Mar 2018

J. Mater. Chem. A, 2018,6, 6617-6624
Article type
Paper

Li2S/carbon nanocomposite strips from a low-temperature conversion of Li2SO4 as high-performance lithium–sulfur cathodes

F. Ye, H. Noh, J. Lee, H. Lee and H. Kim, J. Mater. Chem. A, 2018, 6, 6617
DOI: 10.1039/C8TA00515J

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