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Problems solved by technology
[0008] However, in the prior art, there is an increase in cost depending on the need for solvents, and in the case of solvents that are harmful to the human body, additional costs are incurred in handling and storage, and productivity is reduced because the solvents need to be dried after coating And other issues
Method used
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Examples
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Embodiment 1
[0094] To form the electrode adhesion layer, PVdf-HFP (Kynar2751, Arkema) and silica nanoparticles (AerosilR805, Degusa) were mixed in a weight ratio of 98:2 in a Henschel mixer for 5 minutes, Thereby, a powder for forming an electrode adhesion layer having fluidity was prepared, and the powder was placed in a rotating drum.
[0095] Subsequently, the prepared electrode adhesion layer powder was selectively printed (4% of the total area) to a width of 2 mm on the edge of a 12 μm thick porous polyolefin substrate (F12BMS, Toray) by laser printing, and then 70℃ and 90kgf / cm 2 It is laminated with NMC type cathode.
[0096] Likewise, the same pattern printing was also performed on the reverse side of the porous polyolefin substrate, followed by lamination with a graphite-based negative electrode under the same lamination conditions. Thereby, an electrode assembly is manufactured.
Embodiment 2
[0098] AlOOH (AOH6O, Nabaltec) with a size of 500 nm as inorganic particles and AD-SO1 (LGChem.) as a dispersant were mixed at a weight ratio of 97:3, and were mixed in acetone as a solvent by ball milling for 12 hours, This forms a slurry with a solids content of about 20%.
[0099] The prepared slurry was coated with a width of 4 mm on one surface of a 12 μm-thick porous polyolefin substrate (F12BMS, Toray) to obtain an organic / inorganic composite separator with a porous coating.
[0100] Then, in order to form the electrode adhesion layer, PVdf-HFP (Kynar2751, Arkema) and silica nanoparticles (AerosilR805, Degusa) were mixed at a weight ratio of 98:2 and mixed using a Henschel mixer for 5 minutes, thereby A powder for forming an electrode adhesion layer having flowability was prepared and placed in a rotating drum.
[0101] Subsequently, the prepared electrode adhesion layer powder was selectively printed (4% of the total area) to a width of 2 mm on the edge of the porous ...
Embodiment 3
[0104] An electrode assembly was fabricated in the same manner as in Example 2, except that the powder for the electrode adhesion layer was selectively printed (10% of the total area) in a linear pattern with a gap of 18 mm and a width of 2 mm.
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Abstract
The present invention relates to a method for manufacturing a separator for a lithium secondary battery, a separator manufactured by the method, and a lithium secondary battery comprising the same, the method comprising: a charging step (S1) for charging polymer particles and forming the charged polymer particles; a laminating step (S2) for laminating the charged polymer particles on at least one side of a porous polymer substrate and forming an electrode adhesive layer in such a manner that, relative to the entire surface area of the porous polymer substrate, the formation surface area of the electrode adhesive layer is 1 to 30% thereof; and a fixing step (S3) for fixing the electrode adhesive layer by means of heat and pressure. According to the present invention, the method for manufacturing a separator for a lithium secondary battery, introducing an electrode adhesive layer by using static electricity, not by slurry coating comprising a solvent, does not require a solvent due to polymer particles being applied in a laser printing technique, thereby generating a cost-saving effect due to there being no burden for handling and storage, and does not require a step for drying the solvent, thereby being capable of rapidly manufacturing a separator for a lithium secondary battery. Furthermore, it is possible to prevent the resistance increase of a lithium secondary battery by coating only a certain surface area, not the entire surface area, of the electrode adhesive layer.
Description
technical field [0001] The present invention relates to a method for preparing a separator for a lithium secondary battery, and more particularly, to a method in which an electrode adhesion layer is formed on the surface of the separator, including in this case by using a laser printing method without using A solvent for easy handling and storage, thereby having a cost-saving effect of a method for producing a separator for a lithium secondary battery, a separator prepared by the method, and a lithium secondary battery including the separator. [0002] This application claims priority from Korean Patent Application No. 10-2013-0116745, filed in Korea on September 30, 2013, and Korean Patent Application No. 10-2014-0130571, filed in Korea on September 29, 2014 , the contents disclosed in this specification are incorporated into this specification by reference. Background technique [0003] Recently, more and more people have become interested in energy storage technology. A...
Claims
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Application Information
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