LITHIUM TITANIUM COMPOSITE OXIDE, PREPARATION METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

The present invention relates to a lithium titanium composite oxide, a preparation method therefor, and a lithium secondary battery comprising the same and, more specifically, to: a lithium titanium composite oxide prepared by adding a pore-inducing material in a wet milling step in order to maintain suitable pores inside particles and to control the primary particle size of the lithium titanium composite oxide; a preparation method therefor; and a lithium secondary battery comprising the same. According to the present invention, the lithium titanium composite oxide having a decreased primaryparticle size has a pore-inducing material added thereto such that the moving distance of lithium ions is shortened and the diffusion rate of lithium ions increases, and thus excellent output characteristics are exhibited by means of a structure advantageous in electron transfer. 本发明涉及锂钛复合氧化物、其制备方法及包含锂钛复合氧化物的锂二次电池，尤其涉及在湿磨步骤中添加空隙形成物质，以在粒子内部维持适当的空隙，调节锂钛复合氧化物的一次粒子大小制备而成的锂钛复合氧化物、其制备方法及包含锂钛复合氧化物的锂二次电池。