Electrochemical properties of 0.3Li 2MnO 3·0. 7LiNi 0.5Mn 0.5O 2 composite cathode powders prepared by large-scale spray pyrolysis

Young Jun Hong, Jung Hyun Kim, Min Ho Kim, Yun Chan Kang

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

0.3Li 2MnO 3·0.7LiNi 0.5Mn 0.5O 2 composite cathode powders with a mixed-layer crystal structure comprising Li 2MnO 3 and LiNi 0.5Mn 0.5O 2 phases are prepared by spray pyrolysis. The composition of the cathode powders is found to be Li 1.19Ni 0.39Mn 0.61O 2 by ICP analysis. At a constant current density of 30 mA g -1, the initial discharge capacities of the composite cathode powders post-treated at 700, 750, 800, and 850°C are 177, 202, 215, and 212 mAh g -1, respectively. The discharge capacity of the composite cathode powders post-treated at 800°C decreases from 215 mAh g -1 to 205 mAh g -1 by the 40th cycle, in which the capacity retention is 95%. The first cycle has a low Coulombic efficiency of 75%. However, in the subsequent cycles, the Coulombic efficiency is retained at nearly 100%. The dQ/dV curves show that Mn exists as Mn 4+ in the sample. The Mn 4+ ions in the cathode powders become increasingly active as the cycle number increases and participate in the electrochemical reaction.

Original languageEnglish
Pages (from-to)2022-2026
Number of pages5
JournalMaterials Research Bulletin
Volume47
Issue number8
DOIs
Publication statusPublished - 2012 Aug

Keywords

  • A. Layered compounds
  • B. Chemical synthesis
  • C. Electrochemical measurements
  • D. Energy storage

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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