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Cited by 319

The DOI matches its Crossref record; 34 of the 34 references it cites were found in a registry or an index.

Significantly Improved Long-Cycle Stability in High-Rate Li–S Batteries Enabled by Coaxial Graphene Wrapping over Sulfur-Coated Carbon Nanofibers

Lu, Songtao, Cheng, Yingwen, Wu, Xiaohong, Liu, Jie·2013·Nano Letters
DOI 10.1021/nl400543y
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Abstract

Long-term instability of Li-S batteries is one of their major disadvantages compare to other secondary batteries. The reasons for the instability include dissolution of polysulfide intermediates and mechanical instability of the electrode film caused by volume changes during charging/discharging cycles. In this paper, we report a novel graphene-sulfur-carbon nanofibers (G-S-CNFs) multilayer and coaxial nanocomposite for the cathode of Li-S batteries with increased capacity and significantly improved long-cycle stability. Electrodes made with such nanocomposites were able to deliver a reversible capacity of 694 mA h g(-1) at 0.1C and 313 mA h g(-1) at 2C, which are both substantially higher than electrodes assembled without graphene wrapping. More importantly, the long-cycle stability was significantly improved by graphene wrapping. The cathode made with G-S-CNFs with a initial capacity of 745 mA h g(-1) was able to maintain ~273 mA h g(-1) even after 1500 charge-discharge cycles at a high rate of 1C, representing an extremely low decay rate (0.043% per cycle after 1500 cycles). In contrast, the capacity of an electrode assembled without graphene wrapping decayed dramatically with a 10 times high rate (~0.40% per cycle after 200 cycles). These results demonstrate that the coaxial nanocomposites are of great potential as the cathode for high-rate rechargeable Li-S batteries. Such improved rate capability and cycle stability could be attributed to the unique coaxial architecture of the nanocomposite, in which the contributions from graphene and CNFs enable electrodes with improved electrical conductivity, better ability to trap soluble the polysulfides intermediate and accommodate volume expansion/shrinkage of sulfur during repeated charge/discharge cycles.

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Metadata

Authors
Lu, S., Cheng, Y., Wu, X., & Liu, J.
Venue
Nano Letters
Publisher
American Chemical Society (ACS)
Published
2013-05-22
Volume
13
Issue
6
Pages
2485-2489
ISSN
  • 1530-6984 (ISSN-L)
  • 1530-6992
DOI
10.1021/nl400543y
OpenAlex
W2328166017
Cited by
319
References
34
FWCI
31.75
Type
journal article
Language
en
Open access
closed

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