Yolk-shell, hollow, and single-crystalline ZnCo2O4 powders: Preparation using a simple one-pot process and application in lithium-ion batteries

Seung Ho Choi, Yun Chan Kang

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

The electrochemical properties of yolk-shell-structured, multi-component, transition-metal oxides have not yet been properly compared to those of hollow-structured or nanoscale powders. In this study, yolk-shell, hollow, and single-crystalline ZnCo2O4 powders with uniform compositions are prepared by using simple gas-phase reaction methods. Double-shelled ZnCo2O4 yolk-shell powder is prepared directly from the spray solution by using spray pyrolysis. Single-crystalline ZnCo2O4 nanopowder is prepared by means of flame spray pyrolysis. The yolk-shell ZnCo2O4 powder shows higher charge and discharge capacities than the hollow and single-crystalline powders. The yolk-shell, hollow, and single-crystalline ZnCo2O4 powders deliver discharge capacities of 753, 586, and 206mAh g-1, respectively, after 200 cycles at a charge/discharge rate of 3A g-1, and the corresponding capacity retentions measured after the first cycle are 99, 74, and 27 %, respectively. The yolk-shell ZnCo2O4 powders are structurally stable during cycling and have good electrochemical properties even at high current densities. Heroes in a double shell: Double-shelled ZnCo2O4 yolk-shell powder with a complex composition is prepared directly from the sucrose-containing spray solution by using spray pyrolysis within a short residence time. The yolk-shell ZnCo 2O4 powder displayed better cycling and rate performances than those of the hollow and single-crystalline powders, and have good electrochemical properties even at high current densities.

Original languageEnglish
Pages (from-to)2111-2116
Number of pages6
JournalChemSusChem
Volume6
Issue number11
DOIs
Publication statusPublished - 2013 Nov
Externally publishedYes

Keywords

  • anode materials
  • energy conversion
  • lithium ion batteries
  • nanoparticles
  • spray pyrolysis

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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