Novel hierarchically porous carbon materials obtained from natural biopolymer as host matrixes for lithium-sulfur battery applications

Bin Zhang, Min Xiao, Shuanjin Wang, Dongmei Han, Shuqin Song, Guohua Chen, Yuezhong Meng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

117 Citations (Scopus)

Abstract

Novel hierarchically porous carbon materials with very high surface areas, large pore volumes and high electron conductivities were prepared from silk cocoon by carbonization with KOH activation. The prepared novel porous carbon-encapsulated sulfur composites were fabricated by a simple melting process and used as cathodes for lithium sulfur batteries. Because of the large surface area and hierarchically porous structure of the carbon material, soluble polysulfide intermediates can be trapped within the cathode and the volume expansion can be alleviated effectively. Moreover, the electron transport properties of the carbon materials can provide an electron conductive network and promote the utilization rate of sulfur in cathode. The prepared carbon-sulfur composite exhibited a high specific capacity and excellent cycle stability. The results show a high initial discharge capacity of 1443 mAh g-1and retain 804 mAh g-1after 80 discharge/charge cycles at a rate of 0.5 C. A Coulombic efficiency retained up to 92% after 80 cycles. The prepared hierarchically porous carbon materials were proven to be an effective host matrix for sulfur encapsulation to improve the sulfur utilization rate and restrain the dissolution of polysulfides into lithium-sulfur battery electrolytes.
Original languageEnglish
Pages (from-to)13174-13182
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number15
DOIs
Publication statusPublished - 13 Aug 2014
Externally publishedYes

Keywords

  • biopolymers
  • carbon-sulfur composites
  • cyclical stability
  • electron conductivity
  • hierarchically porous carbon materials
  • lithium-sulfur batteries

ASJC Scopus subject areas

  • Materials Science(all)

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