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CN-122006959-A - Slit die coater and electrode for secondary battery

CN122006959ACN 122006959 ACN122006959 ACN 122006959ACN-122006959-A

Abstract

A slot die coater includes a first die block, a second die block on the first die block, the second die block having a first cavity configured to receive a mixture, a first slot between the first die block and the second die block, a third die block on the second die block, the third die block having a second cavity configured to receive a slurry, a second slot between the third die block and the second die block, a first spacer in the first slot, the first spacer including a shielding protrusion connecting the first slot to an interior region of the first discharge port and protruding from the interior region toward the first discharge port, the first discharge port setting a width of the mixture discharged and applied from the first discharge port, and a second spacer in the second slot, the second spacer including a notch connecting the second slot to the second discharge port and overlapping a portion of an edge portion of the first discharge port.

Inventors

  • An Enzhen
  • JIN XIANGJI
  • JIN LONGZHU
  • GUO JUNHE
  • Jin Xuanche
  • JIN RONGYIN
  • Hong can

Assignees

  • 三星SDI株式会社

Dates

Publication Date
20260512
Application Date
20251024
Priority Date
20241112

Claims (20)

  1. 1. A slot die coater comprising: A first mold block; a second mold block on the first mold block, the second mold block having a first chamber configured to hold a mixture; a first slit between the first and second mold blocks; A third mold block on the second mold block, the third mold block having a second chamber configured to hold a barrier slurry; a second slit between the third mold block and the second mold block; a first spacer in the first slit, the first spacer comprising: an inner region connecting the first slit to a first discharge port for setting a width of the mixture discharged from the first discharge port and applied to the substrate through the first discharge port, and A shielding protrusion protruding from the inner region toward the first discharge port, and A second separator in the second slit, the second separator including a notch connecting the second slit to a second discharge port, and the second discharge port overlapping at least a portion of an edge portion of the first discharge port.
  2. 2. The slot die coater of claim 1, wherein the shielding protrusion is centered within the first partition, the shielding protrusion being spaced from the first discharge port.
  3. 3. The slot die coater of claim 1, wherein the shielding protrusion includes a central portion protruding toward the first discharge opening and inclined sections symmetrical to each other with respect to a center line of the shielding protrusion, the inclined sections being on opposite sides of the central portion.
  4. 4. The slot die coater of claim 1, wherein: the first separator further includes a base portion, a plurality of extension portions extending from one side of the base portion toward the first discharge port, and The shielding protrusion protrudes from the base portion toward the first discharge port, the shielding protrusion being between the plurality of extension portions.
  5. 5. The slot die coater of claim 4, wherein the ends of two of the plurality of extensions at opposite ends of the first spacer, respectively, are bent toward the center of the first spacer.
  6. 6. The slot die coater of claim 5, wherein at least a portion of the ends of one of the plurality of extensions between the two extensions at opposite ends of the first separator is bent toward at least one of the two extensions.
  7. 7. The slot die coater of claim 4, wherein the shielding protrusion is between adjacent two of the plurality of extensions.
  8. 8. The slot die coater of any of claims 1-7, wherein the second discharge orifice overlaps at least a portion of each of the opposite ends of the first discharge orifice.
  9. 9. The slot die coater of any of claims 1-7, wherein the first slot is above the second slot.
  10. 10. The slot die coater of claim 9, wherein: the first slit extends horizontally between the first mold block and the second mold block, and The second slit extends between the second and third mold blocks at an oblique angle relative to the first slit to be closer to the first slit at a position closer to the second discharge port.
  11. 11. The slit die coater of any of claims 1 to 7, wherein a separation distance in a thickness direction between the first discharge port and the second discharge port is 0.
  12. 12. The slot die coater of any of claims 1-7, wherein the barrier slurry comprises a water-soluble polymer.
  13. 13. The slot die coater of claim 12, wherein the water-soluble polymer comprises a carboxymethyl cellulose salt.
  14. 14. The slot die coater of any of claims 1-7, wherein the recess of the second separator comprises a plurality of recesses open toward the second discharge port, the plurality of recesses corresponding to edge portions of the mixture applied to the substrate through the first discharge port.
  15. 15. The slot die coater of claim 14, wherein the plurality of notches extend in a direction oriented away from the second discharge opening.
  16. 16. An electrode for a secondary battery, comprising: A substrate; A coated mixture layer on the substrate, the coated mixture layer comprising the mixture discharged through the first slot of the slot die coater of any one of claims 1 to 15, and A barrier film on the substrate, the barrier film at an opposite end of the coated mixture layer, the barrier film comprising the barrier slurry discharged through the second slit of the slit die coater.
  17. 17. The electrode for a secondary battery according to claim 16, wherein a maximum thickness of the barrier film on the substrate is smaller than a maximum thickness of the coated mixture layer.
  18. 18. The electrode for a secondary battery according to claim 16, wherein the barrier film is formed by removing moisture from the barrier slurry.
  19. 19. The electrode for a secondary battery according to claim 16, wherein the viscosity of the barrier slurry is equal to or greater than the viscosity of the mixture.
  20. 20. The electrode for a secondary battery according to claim 16, wherein the mixture comprises an electrode active material, a conductive material, and a binder.

Description

Slit die coater and electrode for secondary battery Technical Field Aspects of embodiments of the present disclosure relate to a slot die coater and an electrode for a secondary battery. Background Unlike primary batteries, which are not designed to be (re) charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and re-charged. Low-capacity secondary batteries are used for portable small-sized electronic devices such as smart phones, function phones, notebook computers, digital cameras, and video cameras, and large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing electric power (e.g., electric power storage at home and/or utility scale). The secondary battery generally includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. Slit die coating technology is one of key technologies for uniformly coating active material slurry onto an electrode substrate in a secondary battery manufacturing process. The slot die coater can precisely control the viscosity and coating thickness of the slurry. Therefore, the slot die coater can be used to stably produce high quality electrodes. In the slit die coating process, the slit coated slurry passing through the slit die may be uniformly distributed on the substrate. As a result, this uniform coating directly affects the performance and lifetime of the battery. In the production of an electrode for a secondary battery, slit die coating provides higher precision and uniformity than roll coating, and has an advantage of minimizing material waste. In other examples, the slot die coater is capable of producing electrodes having various thicknesses by controlling the process speed thereof, and thus is suitable for mass production. The structure of the slot die coater has high mechanical stability and is capable of precisely coating on various substrates according to the flow characteristics of the slurry. The above information disclosed in this background section is for enhancement of understanding of the background of the present disclosure and, therefore, it may contain information that does not form a related (or prior) art. Disclosure of Invention According to one or more embodiments of the present disclosure, a slot die coater includes a first die block, a second die block on the first die block, the second die block having a first chamber configured to receive a mixture, a first slot between the first die block and the second die block, a third die block on the second die block, the third die block having a second chamber to receive a barrier slurry (barrer slurry), a second slot between the third die block and the second die block, a first spacer in the first slot, and a second spacer in the second slot, wherein the first spacer includes a shielding protrusion connecting the first slot to an interior region of the first slot and protruding from the interior region toward the first slot, the first slot for setting a width of the mixture discharged from the first slot and applied to a substrate through the first slot (or determining a width of the mixture in a case where the mixture is discharged through the first slot connected to the first slot and applied to the substrate), and wherein the second spacer overlaps at least a portion of the second slot with the first slot at least a portion of the barrier slurry, the second spacer being connected to the second slot at least partially overlapping the first slot and the second slot. In an embodiment, the shielding protrusion may be located at an inner center of the first separator, and the shielding protrusion may be spaced apart from the first discharge port. In an embodiment, the shielding protrusion may include a central portion protruding toward the first discharge port and inclined sections symmetrical to each other with respect to a center line of the shielding protrusion, and the inclined sections may be located on both sides of the central portion. In an embodiment, the first separator may further include a base portion and a plurality of extension portions extending from one side of the base portion toward the first discharge port, and the shielding protrusion may protrude from the base portion in a direction toward the first discharge port and may be located between the plurality of extension portions. In an embodiment, the ends of two extension portions located at both ends (or opposite ends) of the first separator among the plurality of extension portions may be bent toward the center of the first separator. In an embodiment, at least a portion of the end of one of the plurality of extension portions located between two extension portions at both ends (or opposite ends) of the first separator may be bent toward at least one of the two extension portio