the SnO2 powder. [0013] In the method for preparing the SnO2 powder in this embodiment of the present invention, the tin-containing salt may be selected from the group consisting of SnF4, SnCl4, Snl4, Sn(C2H3O2)2, SnCl2, SnBr2, Snl2, and a mixture including at least two of the forgoing salts.