• 文献标题:   Dense integration of graphene and sulfur through the soft approach for compact lithium/sulfur battery cathode
  • 文献类型:   Article
  • 作  者:   LI HF, YANG XW, WANG XM, LIU MN, YE FM, WANG J, QIU YC, LI WF, ZHANG YG
  • 作者关键词:   lithium batterie, sulfur, graphene, compact cathode, dense integration
  • 出版物名称:   NANO ENERGY
  • ISSN:   2211-2855 EI 2211-3282
  • 通讯作者地址:   Chinese Acad Sci
  • 被引频次:   102
  • DOI:   10.1016/j.nanoen.2015.01.007
  • 出版年:   2015

▎ 摘  要

The main challenge for the lithium/sulfur battery is the significant capacity decay over cycling, as the result of the diffusion of lithium polysulfide and volume/morphology changes of sulfur electrode. Porous graphene monoliths have been widely used to alleviate these problems with its confined frameworks of porous structures and strong mechanical property; however, bulk graphene materials were normally loosely packed, leading to the low utilization efficiency of pores and unsatisfactory frustration in suppressing polysulfide dissolution/shuttle owing to their large and highly open pores. Herein, we report the dense integration of sulfur and graphene (S-G) gel through the soft approach to prepare a compact sulfur cathode with dense but porous structure. The compact S-G structures could better increase the bonding between sulfur and graphene, immobilize sulfur and restrain the polysulfide diffusion within the more closed pores than loose counterpart, and thus achieve improved volumetric discharge capacities, high rate and long-term cycling performance. (C) 2015 Elsevier Ltd. All rights reserved.