Active material coating apparatus and coating method using the same

An apparatus for coating a substrate used in a battery with a battery active material, the apparatus comprising:

• a first die that is configured to supply an active material in a slurry state, wherein the first die defines a first lip portion of an outlet slot that receives the active material from the first die and outputs the active material;
• a second die that engages with the first die, wherein the second die defines a second lip portion of the outlet slot wherein the first and second dies are movable with respect to each other, the second die including an adjusting screw that is screw-coupled to the hinge portion to be controlled in a clockwise direction or a counterclockwise direction, wherein the second die is assembled to the first die;
• a first spacer having a first thickness that is interposed between the first and the second die, wherein the first spacer is positioned a first distance from the outlet slot and defines a first gap of the outlet slot;
• a second spacer having a second thickness greater than the first thickness that is supported by an end of the first spacer so as to be movable in a width direction of the first gap interposed between the first and the second die, wherein the second spacer is positioned a second distance, less than the first distance from the outlet slot, wherein the second spacer is flexible such that movement between the first and the second die can result in the first gap of the outlet slot being varied, wherein the second spacer is configured such that rotation of the adjusting screw moves the second lip portion in the z-axis direction with respect to the first lip portion such that a position control of a y-axis direction of the second spacer between the first lip portion and the second lip portion is achieved;
• and
• a controller that induces movement between the first and the second dies so as to vary the first gap of the outlet slot to provide more uniform thickness of the battery active material through the outlet slot.