Dual functional effect of the ferroelectricity embedded interlayer in lithium sulfur battery

Byung Dae Son, Sung Ho Cho, Ki Yoon Bae, Byung Hyuk Kim, Wooyoung Yoon

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A carbon nanotube sheet having homogeneously distributed BaTiO 3 is applied to the Li-S cell system as a pseudo-current collector between the cathode and separator. This interlayer serves as a site distributor, where polysulfide eluted from the cathode continuously reacts, and it is expected to play a role as a more effective current collector by mixing the ferroelectric material. A cell utilizing a ferroelectricity embedded interlayer exhibits a higher capacity (908 mAh g −1 ) at 0.2C than that of carbon alone (740 mAh g −1 ) at 200 th cycle. This result corresponds to a capacity retention ratio enhancement from 67.5% to 75.6%. Furthermore, it is confirmed that the retention of the coulombic efficiency is effectively maintained in long cycles at 0.5C (94.5%–99.6%). This is not only because the modified interlayer functions as an effective current collector owing to the high affinity of the ferroelectric material to polysulfide, but also because ferroelectricity in the interlayer acts as a polysulfide anchor. The evenly distributed polarization leads to a uniform deposition of sulfur, which results in the prevention of inactive sulfur agglomeration and dissolution of polysulfide. Thus, the utilization of active material can be improved with stabilized reaction.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalJournal of Power Sources
Volume419
DOIs
Publication statusPublished - 2019 Apr 15

Keywords

  • Barium titanate
  • Electrochemistry
  • Ferroelectricity
  • Interlayer
  • Lithium ion battery
  • 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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