Kinetic insight into perovskite La0.8Sr0.2VO3 nanofibers as an efficient electrocatalytic cathode for high-rate Li-O2 batteries

Myeong Chang Sung, Gwang Hee Lee, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Efficient electrocatalysis at the cathode is essential for overcoming the limitations of Li-O2 batteries such as poor stability and low rate capability. Herein, we systematically studied the kinetic behavior of a Li-O2 battery comprising perovskite La0.8Sr0.2VO3 nanofibers formed by partial Sr-cation doping and V cations with multiple oxidation states. Compared with undoped LaVO3 and La0.8Sr0.2VO4 nanofibers, perovskite La0.8Sr0.2VO3 nanofibers exhibited an improved capacity of 2000 mA g1, and a 20-times-longer cycle life in Li-O2 batteries. X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and photoluminescence analyses revealed that the performance variations mainly originated from crystal defects, which modulate oxygen reduction/evolution kinetics. Through in situ Raman analysis, we showed that these structural defects are closely related to the oxygen reduction/evolution behavior of La0.8Sr0.2VO3 nanofibers and result in fewer parasitic reactions. This study offers insights into the potential rate capability of Li-O2 batteries and related devices.

Original languageEnglish
Pages (from-to)1295-1310
Number of pages16
JournalInfoMat
Volume3
Issue number11
DOIs
Publication statusPublished - 2021 Nov

Bibliographical note

Publisher Copyright:
© 2021 The Authors. InfoMat published by UESTC and John Wiley & Sons Australia, Ltd.

Keywords

  • electrocatalysts
  • LaSrVO
  • Li-O battery
  • nanofiber
  • perovskite structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science (miscellaneous)
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Kinetic insight into perovskite La0.8Sr0.2VO3 nanofibers as an efficient electrocatalytic cathode for high-rate Li-O2 batteries'. Together they form a unique fingerprint.

Cite this