Lithium titanium composite oxide comprising aluminum-coated primary particles and manufacturing method therefor

A method for manufacturing a lithium titanium composite oxide including aluminum-coated primary particles, the method comprising:

• i) mixing, in a solid state, a lithium-containing compound, a titanium oxide, and a dissimilar metal compound in a stoichiometric ratio;
• ii) manufacturing a slurry by dispersing the solid mixture of i) in a solvent and performing wet pulverizing until particles having an average particle diameter in a range from 0.1 μm to 0.2 μm are formed;
• iii) spray-drying the slurry to form particles;
• iv) plasticizing the spray-dried particles;
• v) pulverizing the plasticized particles;
• vi) manufacturing a slurry by dispersing a mixture of the pulverized particles and an aluminum compound in a solvent and pulverizing the dispersed mixture;
• vii) performing spray-drying;
• and
• viii) performing heat treatment.