Facile synthesis of multi-shell structured binary metal oxide powders with a Ni/Co mole ratio of 1:2 for Li-Ion batteries

Seung Ho Choi, Sun Kyu Park, Jung Kul Lee, Yun Chan Kang

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Multi-shell structured binary transition metal oxide powders with a Ni/Co mole ratio of 1:2 are prepared by a simple spray drying process. Precursor powder particles prepared by spray drying from a spray solution of citric acid and ethylene glycol have completely spherical shape, fine size, and a narrow size distribution. The precursor powders turn into multi-shell powders after a post heat-treatment at temperatures between 250 and 800°C. The multi-shell structured powders are formed by repeated combustion and contraction processes. The multi-shell powders have mixed crystal structures of Ni1-xCo2O4-x and NiO phases regardless of the post-treatment temperature. The reversible capacities of the powders post-treated at 250, 400, 600, and 800°C after 100 cycles are 584, 913, 808, and 481 mA h g-1, respectively. The low charge transfer resistance and high lithium ion diffusion rate of the multi-shell powders post-treated at 400°C with optimum grain size result in superior electrochemical properties even at high current densities.

Original languageEnglish
Pages (from-to)481-488
Number of pages8
JournalJournal of Power Sources
Volume284
DOIs
Publication statusPublished - 2015 Jun 15

Keywords

  • Energy conversion
  • Energy storage materials
  • Multi-shell
  • Nanostructures
  • Synthesis design

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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