Electrochemical properties of nanosized Li2MnO3-Li(Ni1/3Co1/3M n1/3)O2 composite cathode powders prepared by spray pyrolysis

Mun Yeong Son, Seung Ho Choi, Jung Yeul Yun, Hye Moon Lee, Yun Chan Kang

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Nanosized 0.6Li2MnO3-0.4Li(Ni1/3Mn1/3C o1/3)O2 composite powders are prepared by spray pyrolysis at high post-treatment temperatures. The optimum concentrations of citric acid and ethylene glycol, selected as the appropriate organic additives to obtain the composite nanopowders, are 0.2 M each. The spherical precursor powders of large size, with hollow and porous structures, are converted into composite nanopowders. Transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and the cycling properties of the powders indicate that the optimum post-treatment temperature for obtaining composite cathode nanopowders is 900 °C. The mean size of the composite powders post-treated at 900 °C is 136 nm. The composite cathode powders post-treated at 900 °C have high initial charge/discharge capacities of 350 and 291 mAh g-1. The discharge capacity of the composite cathode powder post-treated at 900 °C decreases from 291 to 269 mAh g-1 by the 30th cycle, in which the capacity retention is 92.4%.

Original languageEnglish
Pages (from-to)703-719
Number of pages17
JournalInternational Journal of Electrochemical Science
Volume8
Issue number1
Publication statusPublished - 2013 Jan 1

Keywords

  • Cathode material
  • Composite material
  • Nanomaterials
  • Spray pyrolysis

ASJC Scopus subject areas

  • Electrochemistry

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