Net-Structured Filter of Co(OH)2-Anchored Carbon Nanofibers with Ketjen Black for High Performance Li-S Batteries

Yuebin Yang, Leiting Zhang, Hui Xu, Xusong Qin, Yuanfu Deng, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

Lithium sulfur batteries have been extensively explored in recent years owing to their high theoretical energy density (-2600 Wh kg-1), environmental benignity, and low cost of raw materials. Besides the advanced sulfur cathode, various functional separators/interlayers are also being developed as the effective inhibitor of polysulfide diffusion. In this study, Co(OH)2-anchored carbon nanofibers (CNFs) with Ketjen black (KB) dispersed in the void were designed as a dense net-like structure (denoted as Co(OH)2@CNF/KB), which was coated at the surface of a typical commercial separator to help inhibit polysulfide migration. It was demonstrated that the Co(OH)2@CNF/KB-modified separator could effectively increase the charge transfer of the cathode material, trap the dissolved polysulfides, and help to reuse the sequestered active material. As a result, the cell employing this functionalized separator and unmodified sulfur-based electrode exhibits an initial specific capacity of 1394 mA h g-1 at 0.1 C, which converts to 84% utilization of sulfur, and a capacity decay of 0.10% per cycle at 2 C for over 450 cycles. The unique design of Co(OH)2@CNF/KB provides a promising modifying approach for future lithium batteries.

Original languageEnglish
Pages (from-to)17099-17107
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number12
DOIs
Publication statusPublished - 3 Dec 2018

Keywords

  • Carbon nanofibers
  • Co(OH)
  • Electrochemical properties
  • Interlayer
  • Lithium sulfur batteries

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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