Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Combustion Synthesis of $LiMn_2$$O_4$with Citric Acid and the Effect of Post-heat Treatment

  • Han, Yi-Sup (Dept. of Mat. Sci. & Eng., Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Son, Jong-Tea (Dong-A Electric Equipment Co. LTD.) ;
  • Kim, Ho-Gi (Dept. of Mat. Sci. & Eng., Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Jung, Hun-Teak (Department of Ceramic Engineering, Dongshin Univ.)
  • Published : 2001.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

Combustion process with citrate was used to produce the LiMn$_2$O$_4$powder. Precursors are pre-ignited in open air followed by post-heating in the range from $600^{\circ}C$ to 80$0^{\circ}C$ for 4h. With varying the molar ratio (R) of ethylene glycol (EG) to citric acid (CA) from 0 to 4, the effect of EG content on powder characteristics is evaluated. Vacuum drying promote the auto-ignition at room temperature. With small addition of EG metal ion was selectively segregated with organic substances and undesired lithium evaporation occurred during post-heating. LiMn$_2$O$_4$phase which is produced by combustion reaction was decomposed back to Mn$_3$O$_4$because the reaction temperature was higher than 95$0^{\circ}C$. With increasing EG content, the homogeneity of LiMn$_2$O$_4$powder increased and specific surface area increased. And lithium evaporation during vacuum drying and/or ignition also increased.

Keywords