Coating apparatus and method for coating using the same

A coating apparatus to apply a coating solution onto a base material, comprising:

• a first body portion;
• a second body portion spaced-apart by a gap from the first body portion;
• a coating solution inlet arranged in one region of the second body portion;
• a coating solution passage connecting the coating solution inlet to said gap;
• a coating solution outlet arranged at one end of the gap to discharge the coating solution supplied to the coating solution inlet;
• a plurality of air pressure cylinders arranged on the first body portion and in a width direction of the base material, each of the air pressure cylinders including a moving member, each of the air pressure cylinders to adjust a size of the coating solution outlet by adjusting a width of the gap in a width direction of the base material by forward and backward movements of the moving member;
• an air pressure controller and a switching valve to control the forward and the backward movements of the moving member of one of the air pressure cylinders.