Investigation of the processing conditions for the synthesis of rod-shaped LiCoO2

초록

We investigate the processing conditions for the synthesis of rod-shaped LiCoO2 (LCO) by a solid-state calcination of a precursor material which was prepared by a hydrothermal method. The rod-like morphology appeared to be easily broken due to the growth of primary crystals recrystallized during the calcination process. Therefore, it is crucial to maintain the temperature under a certain limit. However, the temperature must be high enough to obtain proper crystallinity of the LCO, ideally above 800 A degrees C. Thus, we determined the optimal calcination temperature condition from the common range of temperatures that satisfies both these limiting conditions. The precursor with average diameter of 1 A mu m sustained the rod shape at calcination temperatures of up to 900 A degrees C; therefore, the optimum calcination temperature could be determined between 800 and 900 A degrees C. Whereas, a proper calcination temperature could not be found for the precursor with 500 nm of diameter because the rod shape did not maintain even at 700 A degrees C. Thus, the maximum temperature at which the rod shape is retained decreases with smaller diameter of the precursor rods, indicating adjusting the diameter above a limiting value is necessary to prepare LCO rod by conventional solid state calcination.

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