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J. Korean Ceram. Soc. > Volume 38(4); 2001 > Article
Journal of the Korean Ceramic Society 2001;38(4): 307.
Combustion Synthesis of $LiMn_2$$O_4$with Citric Acid and the Effect of Post-heat Treatment
Yi-Sup Han, Jong-Tea Son1, Ho-Gi Kim, Hun-Teak Jung2
Dept. of Mat. Sci. & Eng., Korea Advanced Institute of Science and Technology(KAIST)
1Dong-A Electric Equipment Co. LTD.
2Department of Ceramic Engineering, Dongshin Univ.
ABSTRACT
Combustion process with citrate was used to produce the LiMn$_2$O$_4$powder. Precursors are pre-ignited in open air followed by post-heating in the range from $600^{circ}C$ to 80$0^{circ}C$ for 4h. With varying the molar ratio (R) of ethylene glycol (EG) to citric acid (CA) from 0 to 4, the effect of EG content on powder characteristics is evaluated. Vacuum drying promote the auto-ignition at room temperature. With small addition of EG metal ion was selectively segregated with organic substances and undesired lithium evaporation occurred during post-heating. LiMn$_2$O$_4$phase which is produced by combustion reaction was decomposed back to Mn$_3$O$_4$because the reaction temperature was higher than 95$0^{circ}C$. With increasing EG content, the homogeneity of LiMn$_2$O$_4$powder increased and specific surface area increased. And lithium evaporation during vacuum drying and/or ignition also increased.
Key words: Combustion synthesis, $LiMn_2$$O_4$Citric acid, Post-heat treatment, Vacuum drying
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