Characteristics of stabilized spinel cathode powders obtained by in-situ coating method

Young Jun Hong, Mun Yeong Son, Jung Kul Lee, Hyung Bok Lee, Seong Ho Lee, Yun Chan Kang

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8 Citations (Scopus)

Abstract

TiO2-coated LiMn2O4 cathode powders are prepared using an in situ spray pyrolysis process. The TiO2-coated LiMn2O4 powders have spherical aggregated structures of nanometer-sized primary particles. The mean sizes of the primary and secondary TiO2-coated LiMn2O4 powders are 55 and 880 nm, respectively. The transmission electron microscopy images of the LiMn 2O4 primary particles show a single-crystalline and well-faceted structure. The single-crystalline LiMn2O4 primary particles are uniformly coated with an amorphous TiO2 layer. An immediate reaction of titanium tetraisopropoxide with oxygen forms a small flame at the exit of an alumina tube located in the center part of a quartz reactor. Sudden collisions between TiO2 vapor and submicron-sized composite powders of the Li and Mn components occur to form the TiO 2-coated cathode powders. The discharge capacities of the TiO 2-coated LiMn2O4 cathode powders are 126 and 109 mAh g-1 in the first and 170 cycles at a current density of 1 C. The capacity retentions of the pure and TiO2-coated LiMn 2O4 powders are 69% and 86% of the initial capacity after 170 cycles.

Original languageEnglish
Pages (from-to)625-630
Number of pages6
JournalJournal of Power Sources
Volume244
DOIs
Publication statusPublished - 2013 Jan 1
Externally publishedYes

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Keywords

  • Cathode material
  • Lithium manganate
  • Spray pyrolysis
  • Surface coating

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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