Improving electrochemical properties of Lithium–Sulfur batteries by adding a catalyst-embedded interlayer

Sung Ho Cho, Sung Man Cho, Ki Yoon Bae, Byung Hyuk Kim, Byung Dae Son, Woo Young Yoon

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

To improve lithium–sulfur (Li–S) battery performance, a new interlayer film of embedded palladium cobalt (Pd3Co) particles is developed. Pd3Co particles on multi-walled carbon nanotubes (MWCNTs) are synthesized by using a modified polyol method. The synthesis of Pd3Co on MWCNTs is confirmed by X-ray diffraction, transmission electron microscopy and energy-dispersive X-ray spectroscopy. The interlayer film is prepared through a filtration method using these powders. Li–S batteries with this interlayer have electrochemical properties superior to those with an MWCNT interlayer (0.2, 0.5, and 2.0 C-rates). At 0.2 and 0.5 C-rates, Pd3Co/MWCNT-interlayer cell achieves a better performance than MWCNT-interlayer cell during 200 cycles. In addition, there is a definite performance difference for 2.0 C-rate during 300 cycles. The discharge capacities for the first and 300 cycles for the MWCNT-interlayer cell are 869 mAh g−1 and 525 mAh g−1, respectively, whereas those for a Pd3Co/MWCNT-interlayer cell are 953 mAh g−1 and 752 mAh g−1, respectively. These improvements are resulted from the catalytic role of Pd3Co, which assists the reaction of polysulfide formation/deformation.

Original languageEnglish
Pages (from-to)33-40
Number of pages8
JournalElectrochimica Acta
Volume315
DOIs
Publication statusPublished - 2019 Aug 20

Bibliographical note

Funding Information:
This study was supported by grants from the National Research Foundation of Korea (NRF), the Korean government (MEST) (2016R1A2B3009481). SEM and EDS examination were performed at the Korea Basic Science Institute, Seoul Center.

Funding Information:
This study was supported by grants from the National Research Foundation of Korea ( NRF ), the Korean government ( MEST ) ( 2016R1A2B3009481 ). SEM and EDS examination were performed at the Korea Basic Science Institute, Seoul Center.

Keywords

  • Catalyst
  • Li–S batteries
  • Palladium cobalt
  • PdCo

ASJC Scopus subject areas

  • General Chemical Engineering
  • Electrochemistry

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