能源化学(英文) ›› 2013, Vol. 22 ›› Issue (2): 336-340.

• Articles • 上一篇    下一篇

Enhanced reversible capacity of Li-S battery cathode based on graphene oxide

Jin Won Kima,b, Joey D. Ocona,b, Dong-Won Parkb, Jaeyoung Leea,b,c   

  1. a. School of Environmental Science and Engineering;
    b. Laboratory for Energy Storage Systems;
    c. Ertl Center for Electrochemistry and Catalysis, RISE, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
  • 收稿日期:2012-11-02 修回日期:2012-12-28 出版日期:2013-03-20 发布日期:2013-04-04
  • 通讯作者: Jaeyoung Lee
  • 基金资助:
    This work was supported by the Core Technology Development Program for Next-Generation Energy Storage of the Research Institute for Solar and Sustainable Energies (RISE) at GIST. J. D. Ocon is grateful to the DOST UPD ERDT Faculty Development Program.

Enhanced reversible capacity of Li-S battery cathode based on graphene oxide

Jin Won Kima,b, Joey D. Ocona,b, Dong-Won Parkb, Jaeyoung Leea,b,c   

  1. a. School of Environmental Science and Engineering;
    b. Laboratory for Energy Storage Systems;
    c. Ertl Center for Electrochemistry and Catalysis, RISE, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
  • Received:2012-11-02 Revised:2012-12-28 Online:2013-03-20 Published:2013-04-04
  • Supported by:
    This work was supported by the Core Technology Development Program for Next-Generation Energy Storage of the Research Institute for Solar and Sustainable Energies (RISE) at GIST. J. D. Ocon is grateful to the DOST UPD ERDT Faculty Development Program.

摘要: Lithium sulfur battery (LSB) offers several advantages such as very high energy density, low-cost, and environmental-friendliness. However, it suffers from serious degradation of its reversible capacity because of the dissolution of reaction intermediates, lithium polysulfides, into the electrolyte. To solve this limitation, there are many studies using graphene-based materials due to their excellent mechanical strength and high conductivity. Compared with graphene, graphene oxide (GO) contains various oxygen functional groups, which enhance the reaction with lithium polysulfides. Here, we investigated the positive effect of using GO mixed with carbon black on the performance of cathode in LSB. We have observed a smaller drop of capacity in GO mixed sulfur cathode. We further demonstrate that the mechanistic origin of reversibility improvement, as confirmed through CV and Raman spectra, can be explained by the stabilization of sulfur in lithium polysulfide intermediates by oxygen functional groups of GO to prevent dissolution. Our findings suggest that the use of graphene oxide-based cathode is a promising route to significantly improve the reversibility of current LSB.

关键词: lithiums sulfur battery, graphene oxide, capacity fading, lithium polysulfide dissolution

Abstract: Lithium sulfur battery (LSB) offers several advantages such as very high energy density, low-cost, and environmental-friendliness. However, it suffers from serious degradation of its reversible capacity because of the dissolution of reaction intermediates, lithium polysulfides, into the electrolyte. To solve this limitation, there are many studies using graphene-based materials due to their excellent mechanical strength and high conductivity. Compared with graphene, graphene oxide (GO) contains various oxygen functional groups, which enhance the reaction with lithium polysulfides. Here, we investigated the positive effect of using GO mixed with carbon black on the performance of cathode in LSB. We have observed a smaller drop of capacity in GO mixed sulfur cathode. We further demonstrate that the mechanistic origin of reversibility improvement, as confirmed through CV and Raman spectra, can be explained by the stabilization of sulfur in lithium polysulfide intermediates by oxygen functional groups of GO to prevent dissolution. Our findings suggest that the use of graphene oxide-based cathode is a promising route to significantly improve the reversibility of current LSB.

Key words: lithiums sulfur battery, graphene oxide, capacity fading, lithium polysulfide dissolution