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Journal of the Korean Ceramic Society 1999;36(7): 698. |
| Oxalate 침전을 이용한 Li-과량 LiMn$_2$O$_4$ Spinel의 습식합성가 분말 특성 |
| 이병우, 김세호 |
| 한국해양대학교 재료공학과 |
| Wet Chemical Preparation of Li-rich LiMn$_2$O$_4$ Spinel by Oxalate Precipitation |
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| ABSTRACT |
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Li rich Li1+xMn2-xO4(x=0.07) spinel powders were prepared by an oxalate precipitation of wet chemical methods at temperature lower than $600^{circ}C$. The FTIR results showed that the powders prepared at $600^{circ}C$ had high degree of crystal quality comparing with the spinel powders prepared by solid state reaction at 75$0^{circ}C$ which was the lowest synthesis temperature of the solid state reaction method. The particle size of powders prepared by the oxalate precipitation at $600^{circ}C$ was smaller than 0.2${mu}{textrm}{m}$ and the specific surface area was 11.01 m2/g A heat treatment over 90$0^{circ}C$ formed second phase in the precipitates. It was shown that there were phase transitions at temperatures. T1,T2 and T2. The transitions involved weight loss and gain during heating and cooling. The low temperature synthesis below $600^{circ}C$ avoided the second phase formation and the prepared powders showed improved compositional and physical properties for secondary lithium battery applications. |
| Key words:
Wet chemical preparation, Oxalate precipitation, Li1$_{1+x}$Mn$_{2-x}$O$_4$ spinel, Low temperature synthesis |
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