Nanosized LiMn2O4 powders prepared by flame spray pyrolysis from aqueous solution

Jang Heui Yi, Jung Hyun Kim, Hye Young Koo, You Na Ko, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

LiMn2O4 powders have been directly prepared by flame spray pyrolysis from an aqueous spray solution of the metal salts. The powders prepared at a low fuel gas flow rate (3 L min-1) comprise particles with a bimodal size distribution, i.e., submicron- and nanometer-sized particles, and have crystal structures of LiMn2O4 and Mn3O4 phases. However, the powders prepared at a high fuel gas flow rate (5 L min-1) comprise nanometer-sized particles and have pure crystal structure of LiMn2O4 phase. The powders comprising nanosized particles are well crystallized, and the particles have a polyhedral structure. The mean particle size of these powders is 27 nm. The powders prepared directly by flame spray pyrolysis comprise nanosized particles and have the pure crystal structure of LiMn2O4, irrespective of the amount of excess lithium in the precursor solution. The initial discharge capacities of these powders increase from 91 to 112 mAh g -1 when the amount of excess lithium is increased from 0% to 30% of the stoichiometric amount. The optimum amount of excess lithium required to prepare LiMn2O4 powders with nanosized particles and the maximum possible initial discharge capacity is 10%.

Original languageEnglish
Pages (from-to)2858-2862
Number of pages5
JournalJournal of Power Sources
Volume196
Issue number5
DOIs
Publication statusPublished - 2011 Mar 1

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Keywords

  • Cathode material
  • Flame spray pyrolysis
  • Lithium manganate

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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