PENGARUH PENAMBAHAN SERBUK Al2O3 DAN Na2CO3 PADA KARAKTER TERMAL PREKUSOR Li4Ti5O12

Abstract

Study on the effect of adding Al₂O₃ and Na₂CO₃ powder on thermal characteristic of Li₄Ti₅O₁₂ precusor have been done. Li₄Ti₅O₁₂ synthesized by using a mixture of Li₂CO₃ and TiO₂ as raw materials through solid state method with calcination at 700 °C. The addition of a bit of the other material will affect the characteristics of the material, especially on the thermal properties. The study consisted of two variations, namely, Al₂O₃ powder was added to the mixture of Li₂CO₃/TiO₂ and the second variation is Al₂O₃ powder and Na₂CO₃ was added to the mixture of Li₂CO₃/TiO₂ and then analyzed by Simulthaneous Thermal Analysis (STA). Measurement of thermal properties include the decomposition temperature, enthalpy, and the determination of the calcination temperature. The measurement results showed that the addition of Al₂O₃ in the precursor decomposition temperature of Li₄Ti₅O₁₂ provide 659 ° C, the enthalpy of 5.675 kJ / g and a calcination temperature of about 750 ° C. While the addition of Al₂O₃ and Na₂CO₃ on Li₄Ti₅O₁₂ precursor gave decomposition temperature of 560 ° C, the enthalpy of 5.672 kJ / g and a calcination temperature of about 680 ° C. The addition of Al₂O₃ powder showed an increase of energy required for the synthesis while the addition of Na₂CO₃ powder showed a decrease in the energy required for the synthesis process.

Keywords: thermal properties of Al₂O₃, STA, Na₂CO₃, Li₄Ti₅O_12.