Yolk–shell-structured manganese oxide/nitride composite powders comprising cobalt-nanoparticle-embedded nitrogen-doped carbon nanotubes as cathode catalysts for long-life-cycle lithium–oxygen batteries

Yeon Jong Oh, Jung Hyun Kim, Yun Chan Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

An air-electrode catalyst material with a hierarchically porous structure and efficient chemical composition can improve the performances of lithium–oxygen (Li–O 2 ) batteries. In this study, hierarchically yolk–shell structured manganese oxide/manganese nitride composite powders comprising Co-nanoparticle-embedded N-doped carbon nanotubes (yCo–NCNT–Mn) are successfully fabricated as O 2 -electrode catalysts for Li–O 2 batteries. The as-prepared yCo–NCNT–Mn powders exhibit high electrocatalytic activities toward both oxygen reduction and evolution. The Li–O 2 battery with yCo–NCNT–Mn exhibits a high capacity (22,344 mA h g −1 at 200 mA g −1 ), low charge overpotential (0.25 V), and long cycling life (227 cycles at 200 mA g −1 and cut-off capacity of 500 mA h g −1 ). Experimental analyses reveal that the improved electrochemical performance can be attributed to the synergistic advantages of the electrically conductive NCNTs and excellent catalytic activity of the bifunctional catalyst as the composite form of Co, NCNT, MnO, and Mn 4 N. Moreover, the unique hierarchical yolk–shell structure increases the capacity by providing a sufficient space to accommodate Li 2 O 2 .

Original languageEnglish
Pages (from-to)86-94
Number of pages9
JournalChemical Engineering Journal
Volume373
DOIs
Publication statusPublished - 2019 Oct 1

Keywords

  • Hierarchical structure
  • Lithium–oxygen batteries
  • Manganese nitride
  • N-doped carbon nanotubes
  • Spray pyrolysis

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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