Device for preparing lithium composite transition metal oxide, lithium composite transition metal oxide prepared using the same, and method of preparing lithium composite transition metal oxide

A device for preparing a lithium composite transition metal oxide for lithium secondary batteries by using supercritical water or subcritical water, the device comprising:

• first and second mixers continuously arranged in a direction in which a fluid proceeds,
• wherein the first mixer has a closed structure comprising:
• a hollow fixed cylinder;
• a rotating cylinder having the same axis as that of the hollow fixed cylinder and having an outer diameter that is smaller than an inner diameter of the fixed cylinder;
• an electric motor to generate power for rotation of the rotating cylinder;
• a rotation reaction space, as a separation space between the hollow fixed cylinder and the rotating cylinder, in which ring-shaped vortex pairs periodically arranged along a rotating shaft and rotating in opposite directions are formed;
• first inlets through which raw materials are introduced into the rotation reaction space;
• and
• a first outlet to discharge a reaction fluid formed from the rotation reaction space.