Preparation method of carbon-coated lithium titanate battery material

The invention discloses a preparation method of a carbon-coated lithium titanate battery material. The preparation method comprises the steps of preparing titanium source dispersion liquid from tetrabutyl titanate, hexadecyl trimethyl ammonium bromide and tert butyl alcohol, preparing a lithium source solution from lithium acetate dehydrate, deionized water and tert butyl alcohol, transferring the mixed titanium source dispersion liquid into a microwave reactor for microwave heating until backflow is realized, dropwise adding the lithium source solution, further reacting for 1 hour after dropwise adding is finished, cooling and removing a solvent, and then drying to obtain a lithium titanate precursor; placing the obtained lithium titanate precursor into a tubular furnace, pretreating the lithium titanate precursor under an air atmosphere at the temperature being 350 DEG C for 1 hour, and then sintering under an Ar atmosphere at the temperature being 800 DEG C for 8 hours to obtain a carbon-coated lithium titanate electrode material; uniformly mixing the obtained active materials, acetylene black and PVDF to obtain a mixture, uniformly coating the surface of an aluminum foil with the mixture to prepare a button battery electrode slice, finally assembling a half battery in a glove box, testing the charge performance and the discharge performance, and detecting the performance of a half battery prepared from the active materials, wherein detection shows that the capacity of carbon-coated lithium titanate is still 100mAh/g under the multiplying power being 1C, and the specific capacity can be still kept at over 99 percent after carbon-coated lithium titanate is recycled for 100 times; compared with pure-phase lithium titanate, carbon-coated lithium titanate is excellent in charge and discharge performances.