High performance freestanding composite cathode for lithium-sulfur batteries

Almagul Mentbayeva, Ayaulym Belgibayeva, Nurzhan Umirov, Yongguang Zhang, Izumi Taniguchi, Indira Kurmanbayeva, Zhumabay Bakenov

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

A freestanding sulfur/dehydrogenated polyacrylonitrile/multiwalled carbon nanotube composite (S/DPAN/MWCNT) was prepared by a simple vacuum filtration of a mixture of S/DPAN composite and MWCNT suspensions, and studied as a cathode for high performance lithium-sulfur batteries. SEM and EDS analysis revealed uniform distribution of sulfur in a conductive pyrolyzed polyacrylonitrile host matrix with MWCNT integrated into the composite. Self-weaving MWCNT create an electronically conductive network and reinforce structural stability of the system, leading to an outstanding electrochemical performance of the composite cathode. Binder/current collector-free composite cathode exhibits high capacities of 1450 mAh g−1 at 0.2 C and 930 mAh g−1 at 2 C charge-discharge rates. A high discharge capacity of 1250 mAh g−1 is achieved after 260 cycles at 0.2 C with a coulombic efficiency around 100%.

Original languageEnglish
Pages (from-to)242-248
Number of pages7
JournalElectrochimica Acta
Volume217
DOIs
Publication statusPublished - Nov 1 2016

Keywords

  • Freestanding sulfur cathode
  • lithium-sulfur battery
  • self-weaving
  • ternary composite
  • vacuum filtration preparation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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