Coating device, method for manufacturing a separator using the same, and separator for lithium secondary battery manufactured thereby
AssigneeLG Energy Solution, Ltd.
InventorsSeung-Hyun LEE, Yu-Bae KIM, Byeong-Kyu LEE, Kyung-Ryun KA
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Abstract
The present invention provides a coating device including: a coater head; an accommodation chamber that is located inside the coater head and accommodates a coating solution; an ultrasonic generator that is located inside the coater head and applies ultrasonic waves to the coating solution accommodated in the accommodation chamber; and a coating bar that transfers the coating solution from the accommodation chamber onto at least one surface of a substrate being transported in one direction.
Claims17
A coating device comprising:
- a coater head;
- an accommodation chamber that is located inside the coater head and accommodates a coating solution;
- an ultrasonic generator that is located inside the coater head and applies ultrasonic waves to the coating solution accommodated in the accommodation chamber;
- and
- a coating bar that transfers the coating solution from the accommodation chamber onto at least one surface of a substrate being transported in one direction.
A method of manufacturing a separator by using a coating device including a coater head, the method comprising:
- supplying a coating solution containing a binder polymer, inorganic particles and a solvent to an accommodation chamber included in the coater head (S10);
- applying ultrasonic waves to the coating solution accommodated in the accommodation chamber by using an ultrasonic generator located inside the coater head (S20);
- and
- transferring the coating solution to which the ultrasonic waves have been applied, onto at least one surface of a substrate being transported in one direction, by using a coating bar provided in the coater head (S30).
A method of manufacturing a separator by using a coating device including a coater head, the method comprising:
- supplying a coating solution containing a binder polymer, inorganic particles and a solvent to an accommodation chamber included in the coater head (P1);
- transferring the coating solution onto at least one surface of a substrate being transported in one direction, by using a coating bar provided in a part of the coater head (P2);
- recovering the coating solution remaining after the coating solution is transferred onto at least one surface of the substrate, by using a recovery unit provided on an outer surface of the coater head (P3);
- and
- applying ultrasonic waves to the coating solution recovered into the accommodation chamber via the recovery unit (P4).
A separator for a secondary battery, the separator comprising:
- a porous polymer substrate;
- and
- an inorganic coating layer that is formed on at least one surface of the porous polymer substrate, and contains inorganic particles and a binder polymer,
- wherein a surface roughness (Ra) of the inorganic coating layer is about 0.12 μm or less,
- a SPAN value of the inorganic particles is about 1.35 or less, and
- the SPAN value is calculated by Equation 1:
- SPAN value=(particle diameter (D90) of inorganic particles−particle diameter (D10) of inorganic particles)/particle diameter (D50) of inorganic particles Equation (1)
Dependencies are inferred from the claim text.