Slot die coating apparatus and the coating method thereof

A slot die coating method, comprising the steps of:

• providing a substrate with an obstacle and a slot die coating apparatus, wherein the slot die coating apparatus comprising:
• a die body, having a flow path and a coating nozzle receiving a slurry from the flow path to dispense the slurry for coating;
• and
• a shim group, disposed in the die body to divide the flow path into a first flow path and a second flow path, wherein the slurry through the first flow path is dispensed from a middle portion of the coating nozzle and the slurry through the second flow path is dispensed from two sides of the coating nozzle;
• wherein the shim group includes two die lips, which are corresponding to the second flow path and extended outward and protruded from the die body, and a distance between a first outlet of the first flow path and the substrate is greater than a distance between a second outlet of the second flow path and the substrate;
• dispensing the slurry from the first outlet in front of the obstacle of the substrate to form a first lateral side;
• closing the dispensing from the first outlet and moving the slot die coating apparatus far away from the substrate to prevent the slot die coating apparatus from colliding the obstacle;
• dispensing the slurry from the second outlet on both sides of the obstacle of the substrate to form two longitudinal sides on the substrate;
• closing the dispensing from the second outlet and moving the slot die coating apparatus downward to an original height with respect to the substrate;
• and
• dispensing the slurry from the first outlet behind the obstacle of the substrate to form a second lateral side.