Increasing sulfur utilization in lithium-sulfur batteries by a Co-MOF-74@MWCNT interlayer

Si Hyeon Sung, Byung Hyuk Kim, Seung Taek Lee, Sanghyeon Choi, Woo Young Yoon

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

To improve lithium-sulfur battery performance, Co-MOF-74 has been applied for the first time as an interlayer with multiwalled carbon nanotubes (MWCNTs). Co-MOF-74@MWCNT was synthesized using a solvothermal method. The fabrication of Co-MOF-74@MWCNT was confirmed by scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, and Brunauer-Emmett-Teller testing. The interlayer was fabricated using a filtration method. Assembled batteries were prepared using a Co-MOF-74@MWCNT interlayer and an MWCNT interlayer and subsequently investigated via cyclic voltammetry tests. Co-MOF-74 promotes a redox reaction and shows a small peak at 1.85 V. A symmetric and full cell test revealed that the Co-MOF-74@MWCNT cell enables a faster redox reaction and higher capacity than that of the MWCNT cell. After 15 cycles, the Co-MOF-74@MWCNT cell achieved a value of 1112 mAh g−1, which is 26% greater than that of the MWCNT cell (880 mAh g−1) at 0.2C. Voltage profile testing showed that the reason for the higher capacity of the Co-MOF-74@MWCNT cell is that it promotes the conversion of Li2S2 to Li2S. Various electrochemical analyses confirmed that the Co-MOF-74@MWCNT interlayer acts not only as a physical and chemical barrier but also promotes the transformation of Li2S2 to Li2S.

Original languageEnglish
Pages (from-to)186-193
Number of pages8
JournalJournal of Energy Chemistry
Volume60
DOIs
Publication statusPublished - 2021 Sept

Bibliographical note

Funding Information:
This work was supported by grants from the National Research Foundation of Korea (NRF) and the Korean government (MSIT) (2017M3A9E2093907 and 2020R1A2C1012838). SEM and EDX examinations were performed at the Korea Basic Science Institute, Seoul Center. We would like to thank Editage (www.editage.co.kr) for English language editing.

Funding Information:
This work was supported by grants from the National Research Foundation of Korea (NRF) and the Korean government (MSIT) (2017M3A9E2093907 and 2020R1A2C1012838). SEM and EDX examinations were performed at the Korea Basic Science Institute, Seoul Center. We would like to thank Editage (www.editage.co.kr) for English language editing.

Publisher Copyright:
© 2021 Science Press

Keywords

  • Co-MOF-74
  • Interlayer
  • Li-S battery
  • Shuttling effect
  • Sulfur utilization

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

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