Li2TiO3 powder material, preparation method of Li2TiO3 powder material, and method for preparing spinel lithium titanate with Li2TiO3 powder material

The invention discloses an Li2TiO3 powder material, a preparation method of the Li2TiO3 powder material, and a method for preparing spinel lithium titanate (Li4Ti5O12) with the Li2TiO3 powder material. The particle size of a primary particle of the Li2TiO3 powder material is 10-100 nanometers; an XRD (X-Ray Diffraction) testing structure is a monoclinic system or a cubic system; and the median particle size D50 is 50 nanometers-15 micrometers. The preparation method of the Li2TiO3 powder material comprises the steps of taking a lithium compound and a titanium compound at a mole ratio Li/Ti of 2:1 as raw materials, adding a certain amount of carbon or carbon precursor, performing uniform mixing in a medium, performing drying, placing the obtained precursor in a furnace, and performing sintering in an air atmosphere to synthesize the Li2TiO3 material. The method for preparing spinel lithium titanate with the Li2TiO3 powder material comprises the steps of mixing the Li2TiO3 powder material and titanium dioxide or metatitanic acid at a metering ratio of 2:3 (a mole ratio of Ti), adding a certain amount of carbon or carbon precursor, performing the uniform mixing in the medium, performing the drying, placing the obtained precursor in the furnace, and performing the sintering in the air atmosphere to synthesize a spinel lithium titanate material. Obtained spinel lithium titanate is high in purity, fine in primary particle and excellent in electrochemical property.