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Preparation of Li4Ti5O12/C composite by one-step solid state method

Abstract The Li4Ti5O12/C composites were synthesized by one-step solid-phase reaction using metatitanic acid, lithium carbonate and sucrose as raw materials. The effects of the molar ratio of lithium to titanium, calcining temperature, calcination time, and sucrose content on the structure of Li4Ti5O12/C composites were studied. XRD, SEM, TEM and electrochemical performance tests were used to characterize the results. The results showed that n(Li):n(Ti) = 0.85, calcination temperature was 750 °C, calcination time was 6 h, and the sucrose addition amount was 30% of the total mass of raw materials. Under the conditions, the pure Li4Ti5O12/C composites can be synthesized. The particles are uniform, the particle size is 0.1–1 μm, and the carbon envelopment is better. The specific capacity is up to 163.94 mAh/g at 0.1 C rate, and the theoretical specific capacity is 175 mAh/g very close.