A functional carbon layer-coated separator for high performance lithium sulfur batteries

A functional carbon layer-coated separator for high performance lithium sulfur batteries A composite separator consisting of a functional layer of conductive carbon on the cathode-side of a Celgard separator has been investigated to improve the electrochemical performance of lithium sulfur batteries. The cell with functional carbon layer-coated separator can reach a high initial capacity of 1070mAhg−1 at the rate of 0.5C, and maintain a high capacity retention ratio with the capacity of 778mAhg−1 after 100th charge/discharge cycle. Besides, the coulombic efficiency of the cell with functional carbon layer-coated separator rises from 80% to nearly 90% without the addition of LiNO3 additive, which indicates the reduction of shuttle effect. The improved cell performance is attributed to the functional carbon-coating layer, which serves as an upper current collector to facilitate electron transport for high active-material utilization and a conductive network for trapping and depositing dissolved sulfur-containing active materials, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solid State Ionics Elsevier

A functional carbon layer-coated separator for high performance lithium sulfur batteries

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0167-2738
eISSN
1872-7689
D.O.I.
10.1016/j.ssi.2015.06.018
Publisher site
See Article on Publisher Site

Abstract

A composite separator consisting of a functional layer of conductive carbon on the cathode-side of a Celgard separator has been investigated to improve the electrochemical performance of lithium sulfur batteries. The cell with functional carbon layer-coated separator can reach a high initial capacity of 1070mAhg−1 at the rate of 0.5C, and maintain a high capacity retention ratio with the capacity of 778mAhg−1 after 100th charge/discharge cycle. Besides, the coulombic efficiency of the cell with functional carbon layer-coated separator rises from 80% to nearly 90% without the addition of LiNO3 additive, which indicates the reduction of shuttle effect. The improved cell performance is attributed to the functional carbon-coating layer, which serves as an upper current collector to facilitate electron transport for high active-material utilization and a conductive network for trapping and depositing dissolved sulfur-containing active materials, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).

Journal

Solid State IonicsElsevier

Published: Oct 1, 2015

References

  • Nano Res.
    Zhang, K.; Zhao, Q.; Tao, Z.L.; Chen, J.
  • Nat. Commun.
    She, Z.W.; Li, W.Y.; Cha, J.J.; Zheng, G.Y.; Yang, Y.; Mcdowell, M.T.; Hsu, P.C.; Cui, Y.
  • Nat. Commun.
    Su, Y.S.; Manthiram, A.
  • Chem. Commun.
    Tao, X.Y.; Chen, F.; Xia, Y.; Huang, H.; Gan, Y.P.; Chen, X.R.; Zhang, W.K.
  • Nano Lett.
    Zhou, W.D.; Xiao, X.C.; Cai, M.; Yang, L.

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