Dual slot die for simultaneously performing electrode slurry coating and insulating solution coating and coating method using the same
The present invention relates to a dual slot die and a coating method using the same, wherein there is the advantage that electrode slurry coating and insulating solution coating simultaneously proceed through a dual slot die to prevent the occurrence of electrode slurry sliding at the edge of the electrode slurry layer. An electrode slurry layer and an insulating layer can be formed on a current collector sheet in a multi-line manner by including a shim having a structure formed with multiple discharge lines capable of discharging the electrode slurry or insulating solution in multiple lines, thereby increasing process efficiency.
1 . A dual slot die comprising:
a lower block, an intermediate block, and an upper block, the dual slot die further including:
a UV lamp disposed on the dual slot die;
a lower shim positioned between the lower block and the intermediate block;
an upper shim positioned between the intermediate block and the upper block;
a lower manifold formed in the lower block to store an electrode slurry; and
an upper manifold formed in the upper block to store an insulating solution having an UV polymerization initiator,
wherein the dual slot die has a structure in which the electrode slurry is stored in the lower manifold and discharged by an electrode slurry discharge line in the lower shim to form an electrode slurry layer, and the insulating solution is stored in the upper manifold and discharged by insulating solution discharge lines in the upper shim to form an insulating solution layer,
wherein the insulating solution discharge lines include a first insulating solution discharge line and a second insulating solution discharge line,
wherein the dual slot die and the UV lamp are stationary, and
wherein the UV lamp is configured to irradiate the insulating solution layer creating a wall of an outer portion of the electrode slurry that prevents sliding of the electrode slurry layer.
2 . The dual slot die of claim 1 , wherein the upper shim extends along a first plane and the lower shim extends along a second plane such that the intersection of the first plane and the second plane forms an angle in the range of 20° to 60°.
3 . The dual slot die of claim 1 , further including one or more additional electrode slurry discharge lines in the lower shim, wherein the upper shim includes two additional insulating solution discharge lines for each of the additional electrode slurry discharge lines.
4 . The dual slot die of claim 1 , wherein an electrode slurry discharge portion of the electrode slurry discharge lines is positioned upstream along a current collector with respect to insulating solution discharge portions of the insulating solution discharge lines, and the UV lamp is positioned downstream from the insulating solution discharge portions.
5 . The dual slot die of claim 1 , wherein the width of a slurry discharge portion of the electrode slurry discharge line and the width of a solution discharge portion of the first insulating solution discharge line do not overlap in the vertical direction of the upper shim.
6 . The dual slot die of claim 1 , wherein the width of a slurry discharge portion of the electrode slurry discharge line and the width of a solution discharge portion of the first insulating solution discharge line overlap each other in the vertical direction of the upper shim, wherein the overlap ranges from 5% to 30% of the width of the insulating solution discharge portion.
7 . The dual slot die of claim 1 , wherein the UV lamp is disposed on the upper block.
8 . The dual slot die of claim 1 , wherein the dual slot die is configured to continuously discharge insulating solution from the insulating solution discharge lines onto a moving substrate.