Improving the electrochemical behavior of lithium-sulfur batteries through silica-coated nickel-foam cathode collector

Sung Ho Cho, Sung Man Cho, Ki Yoon Bae, Byung Hyuk Kim, Wooyoung Yoon

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A facile method that improves the initial specific capacity and capacity retention rate of lithium-sulfur (Li-S) batteries, using silica-back-coated nickel foam has been studied. A new cathode collector in which silica is back-coated onto the nickel foam is fabricated by a facile method that utilizes an ultrasonicator for reducing the electrolyte viscosity at the surface of the sulfur electrode using a polysulfide absorbent. The nickel foam provides more reaction sites than an aluminum current collector does, thus allowing the back-coated silica to absorb the polysulfides. This synergetic effect of nickel foam and silica suppresses the increasing viscosity of the electrolyte and leads to a higher initial specific capacity (1341 mAh/g) at a 0.2-C rate and a higher capacity retention rate after 150 cycles (85%), relative to pristine Li-S batteries (951 mAh/g and 79%, respectively).

Original languageEnglish
Pages (from-to)366-372
Number of pages7
JournalJournal of Power Sources
Volume341
DOIs
Publication statusPublished - 2017 Feb 15

Keywords

  • Li-S cell
  • Nickel foam
  • Silica
  • Sulfur cathode

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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