KR102273521B1 - Method for manufacturing undercoating ink for current collector - Google Patents
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- KR102273521B1 KR102273521B1 KR1020200027010A KR20200027010A KR102273521B1 KR 102273521 B1 KR102273521 B1 KR 102273521B1 KR 1020200027010 A KR1020200027010 A KR 1020200027010A KR 20200027010 A KR20200027010 A KR 20200027010A KR 102273521 B1 KR102273521 B1 KR 102273521B1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 142
- 238000002156 mixing Methods 0.000 claims abstract description 120
- 239000002904 solvent Substances 0.000 claims abstract description 40
- 239000000654 additive Substances 0.000 claims abstract description 21
- 230000000996 additive effect Effects 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims abstract description 21
- 239000006258 conductive agent Substances 0.000 claims abstract description 21
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical group CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000003431 cross linking reagent Substances 0.000 claims description 17
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical group COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims description 9
- 229920002125 Sokalan® Polymers 0.000 claims description 7
- 239000006230 acetylene black Substances 0.000 claims description 7
- 239000004584 polyacrylic acid Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000003273 ketjen black Substances 0.000 claims description 3
- HXVNBWAKAOHACI-UHFFFAOYSA-N 2,4-dimethyl-3-pentanone Chemical compound CC(C)C(=O)C(C)C HXVNBWAKAOHACI-UHFFFAOYSA-N 0.000 claims 1
- 239000000976 ink Substances 0.000 description 71
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 14
- 239000006260 foam Substances 0.000 description 10
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 8
- 229920000742 Cotton Polymers 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 239000007772 electrode material Substances 0.000 description 8
- 239000011888 foil Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000011149 active material Substances 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 241001122767 Theaceae Species 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000011335 coal coke Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910021469 graphitizable carbon Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002006 petroleum coke Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/52—Electrically conductive inks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/72—Current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
본 발명의 집전체용 언더코팅 잉크 제조 방법에 관한 것으로, 제1용매와 바인더를 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 1차 혼합물을 형성하는 1차 혼합 단계; 1차 혼합물에 첨가제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 2차 혼합물을 형성하는 2차 혼합 단계; 2차 혼합물에 제2용매를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 3차 혼합물을 형성하는 3차 혼합 단계; 3차 혼합물에 도전제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 4차 혼합물을 형성하는 4차 혼합 단계; 4차 혼합물을 혼합기를 이용해 진공상태에서 2000 내지 3000rpm으로 100 내지 140분 동안 혼합하는 5차 혼합 단계; 및 5차 혼합이 완료되면 4차 혼합물을 혼합기를 이용해 진공상태에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하는 6차 혼합 단계를 포함하는 것을 특징으로 한다.The present invention relates to a method for manufacturing an undercoating ink for a current collector, comprising: a first mixing step of mixing a first solvent and a binder at 25 to 40 rpm at atmospheric pressure for 20 to 40 minutes using a mixer to form a first mixture; A secondary mixing step of forming a secondary mixture by adding the additive to the primary mixture and then mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer; a tertiary mixing step of forming a tertiary mixture by adding a second solvent to the secondary mixture and then mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer; a fourth mixing step of adding a conductive agent to the tertiary mixture and then mixing with a mixer at 25 to 40 rpm at atmospheric pressure for 20 to 40 minutes to form a quaternary mixture; a fifth mixing step of mixing the fourth mixture in a vacuum at 2000 to 3000 rpm for 100 to 140 minutes using a mixer; and a sixth mixing step of mixing the fourth mixture at 25 to 40 rpm for 20 to 40 minutes in a vacuum state using a mixer when the fifth mixing is completed.
Description
본 발명은 집전체용 언더코팅 잉크 제조 방법에 관한 것으로, 특히 집전체와 활물질 사이의 접착력 개선을 위해 전처리에 의해 형성되는 언더코팅(undercoating)된 잉크(ink)를 부분적으로 용이하게 제거할 수 있는 집전체용 언더코팅 잉크 제조 방법에 관한 것이다.The present invention relates to a method for manufacturing an undercoating ink for a current collector, and in particular, an undercoating ink that is formed by pretreatment to improve adhesion between a current collector and an active material can be partially easily removed. It relates to a method for manufacturing an undercoating ink for a current collector.
전기 이중층 커패시터(EDLC: electric double layer capacitor)는 전극 물질로 활성탄을 사용하고 있으며, 전기 이중층 커패시터의 전극 물질로 사용되는 활성탄에 관련된 기술이 한국공개특허공보 제10-2011-0063472호(특허문헌 1)에 공개되어 있다. An electric double layer capacitor (EDLC) uses activated carbon as an electrode material, and a technology related to activated carbon used as an electrode material of an electric double layer capacitor is disclosed in Korean Patent Application Laid-Open No. 10-2011-0063472 (Patent Document 1). ) is disclosed.
한국공개특허공보 제10-2011-0063472호는 전기 이중층 커패시터의 전극 물질로 사용되는 활성탄 제조 방법으로, 평균 입경이 작고 입자 크기가 균일하며 비표면적이 비교적 큰 활성탄을 용이하고 생산성이 있도록 제조하기 위한 것이다. 한국공개특허공보 제10-2011-0063472호에 기재된 활성탄 제조 방법은 출발 물질로서 석유 코크스나 석탄 코크스와 같은 용이하게 흑연화 가능한 탄소재를 이용하고, 탄소재는 산화 기체 대기하에서 출발 물질을 소성하고, 탄소재의 입자 크기 조절 및 활성화시켜 제조한다. Korean Patent Application Laid-Open No. 10-2011-0063472 discloses a method for producing activated carbon used as an electrode material for an electric double-layer capacitor, for producing activated carbon having a small average particle diameter, uniform particle size, and relatively large specific surface area in an easy and productive manner. will be. The method for producing activated carbon described in Korean Patent Application Laid-Open No. 10-2011-0063472 uses an easily graphitizable carbon material such as petroleum coke or coal coke as a starting material, and the carbon material is calcined in an oxidizing gas atmosphere, It is manufactured by controlling and activating the particle size of the carbon material.
한국공개특허공보 제10-2011-0063472호에 기재된 것과 같이 종래의 전기 이중층 커패시터의 전극 물질은 활성탄을 사용하고 있고, 집전체는 알루미늄박이 사용된다. 알루미늄박은 고온 및 고압의 압연 공정과 압연과정에서 발생되는 열을 냉각시키기 위하여 압연유를 사용함에 의해 유지층이 형성될 수 있으며, 이러한 유지층은 각각 알루미늄박과 활물질 사이의 계면저항을 상승시키고 집전체와 활물질의 사이의 밀착성을 저하시켜 충방전이 지속 될수록 전극물질의 박리되는 현상을 유발시킴에 의해 이를 개선하기 위해 전처리용 잉크 등을 이용해 전처리를 수행하고 있다. As described in Korean Patent Application Laid-Open No. 10-2011-0063472, an electrode material of a conventional electric double layer capacitor uses activated carbon, and an aluminum foil is used as a current collector. A holding layer may be formed in the aluminum foil by using rolling oil to cool the heat generated during the high-temperature and high-pressure rolling process and the rolling process, and these holding layers increase the interface resistance between the aluminum foil and the active material, respectively, and increase the current collector. By lowering the adhesion between the active material and the electrode material as the charging and discharging continues, the electrode material peels off. In order to improve this, pretreatment is performed using pretreatment ink.
전술한 것과 같은 종래의 전기 이중층 커패시터는 전극물질의 박리 현상을 방지하기 위해 집전체의 전체 표면에 전처리가 수행되면 집전체에 리드(lead)를 연결 시 전처리된 영역의 밀착력이 지나치게 큰 경우에 리드가 연결될 부분에 형성된 전처리 부분의 제거가 용이하지 않은 문제점이 있다. In the conventional electric double layer capacitor as described above, when pretreatment is performed on the entire surface of the current collector in order to prevent the electrode material from being peeled off, when the lead is connected to the current collector, when the adhesion of the pretreated region is too large, the lead There is a problem in that it is not easy to remove the pre-treatment part formed on the part to be connected.
본 발명의 목적은 전술한 문제점을 해결하기 위한 것으로, 집전체와 활물질 사이의 접착력 개선을 위해 전처리에 의해 형성되는 언더코팅(undercoating)된 잉크(ink)를 부분적으로 용이하게 제거할 수 있는 집전체용 언더코팅 잉크 제조 방법을 제공함에 있다. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a current collector capable of partially easily removing an undercoated ink formed by pretreatment to improve adhesion between the current collector and an active material. An object of the present invention is to provide a method for manufacturing an undercoating ink.
본 발명의 다른 목적은 집전체에 언더코팅된 잉크를 부분적으로 용이하게 제거할 수 있도록 함으로써 언더코팅된 잉크로 인한 접합 작업의 불량을 방지하여 집전체에 리드를 용이하게 연결할 수 있는 집전체용 언더코팅 잉크 제조 방법을 제공함에 있다. Another object of the present invention is to prevent a defect in bonding operation due to the undercoated ink by making it possible to partially and easily remove the under-coated ink on the current collector so that it is possible to easily connect the lead to the current collector under the current collector. An object of the present invention is to provide a method for manufacturing a coating ink.
본 발명의 집전체용 언더코팅 잉크 제조 방법은 제1용매와 바인더를 혼합기를 이용해 대기압에서 25 내지 40rpm(revolution per minute)으로 20 내지 40분(minute) 동안 혼합하여 1차 혼합물을 형성하는 1차 혼합 단계; 상기 1차 혼합물에 첨가제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 2차 혼합물을 형성하는 2차 혼합 단계; 상기 2차 혼합물에 제2용매를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 3차 혼합물을 형성하는 3차 혼합 단계; 상기 3차 혼합물에 도전제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 4차 혼합물을 형성하는 4차 혼합 단계; 상기 4차 혼합물을 혼합기를 이용해 진공상태에서 2000 내지 3000rpm으로 100 내지 140분 동안 혼합하는 5차 혼합 단계; 및 상기 5차 혼합이 완료되면 상기 4차 혼합물을 혼합기를 이용해 진공상태에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하는 6차 혼합 단계를 포함하며, 상기 1차 혼합 단계에서 상기 제1용매는 IPA(isopropyl alcohol)가 사용되며 상기 바인더는 키토산(chitosan)이나 폴리 아크릴산(poly acrylic acid)이 사용되고, 상기 2차 혼합 단계에서 상기 첨가제는 MEK(metyl ethyl ketone)가 사용되며, 상기 제3차 혼합 단계에서 상기 제2용매는 순수(H2O)가 사용되며, 상기 제4차 혼합 단계에서 상기 도전제는 케첸블랙(ketjen black), 아세틸렌블랙(acetylene black)이나 덴카블랙(denka black)이 사용되는 것을 특징으로 한다.The method for manufacturing an undercoating ink for a current collector of the present invention is a primary method for forming a primary mixture by mixing a first solvent and a binder at 25 to 40 rpm (revolution per minute) at atmospheric pressure for 20 to 40 minutes (minute) using a mixer mixing step; a secondary mixing step of adding an additive to the first mixture and then mixing it for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer to form a secondary mixture; a tertiary mixing step of forming a tertiary mixture by adding a second solvent to the secondary mixture and mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer; a fourth mixing step of adding a conductive agent to the tertiary mixture and then mixing with a mixer at 25 to 40 rpm at atmospheric pressure for 20 to 40 minutes to form a quaternary mixture; a fifth mixing step of mixing the fourth mixture in a vacuum at 2000 to 3000 rpm for 100 to 140 minutes using a mixer; and a sixth mixing step of mixing the fourth mixture in a vacuum at 25 to 40 rpm for 20 to 40 minutes using a mixer when the fifth mixing is completed, wherein in the first mixing step, the first solvent is IPA (isopropyl alcohol) is used and the binder is chitosan or poly acrylic acid, and in the secondary mixing step, MEK (metyl ethyl ketone) is used as the additive, and the third mixing step In the second solvent, pure (H 2 O) is used, and in the fourth mixing step, the conductive agent is ketjen black, acetylene black or denka black. characterized in that
본 발명의 집전체용 언더코팅 잉크 제조 방법은 집전체와 활물질 사이의 접착력 개선을 위해 전처리에 의해 형성되는 언더코팅된 잉크를 부분적으로 용이하게 제거할 수 있는 이점이 있으며, 집전체에 언더코팅된 잉크를 부분적으로 용이하게 제거할 수 있도록 함으로써 언더코팅된 잉크로 인한 접합 작업의 불량을 방지하여 집전체에 리드를 용이하게 연결할 수 있는 이점이 있다.The method for manufacturing an undercoating ink for a current collector of the present invention has the advantage of being able to partially easily remove the undercoated ink formed by pretreatment to improve adhesion between the current collector and the active material, and By allowing the ink to be partially and easily removed, there is an advantage in that the lead can be easily connected to the current collector by preventing a defect in bonding operation due to the undercoated ink.
도 1은 본 발명의 집전체용 언더코팅 잉크 제조 방법을 나타낸 공정 흐름도,
도 2는 본 발명의 집전체용 언더코팅 잉크의 박리 시험 결과를 나타낸 표,
도 3은 종래의 제조 방법으로 제조된 비교예 따른 잉크의 박리 시험 결과를 나타낸 표.1 is a process flow diagram showing a method for manufacturing an undercoating ink for a current collector of the present invention;
2 is a table showing the peel test results of the undercoating ink for a current collector of the present invention;
Figure 3 is a table showing the peel test results of the ink according to the comparative example prepared by the conventional manufacturing method.
이하, 본 발명의 집전체용 언더코팅 잉크 제조 방법의 실시예를 첨부된 도면을 참조하여 설명하면 다음과 같다.Hereinafter, an embodiment of a method for manufacturing an undercoating ink for a current collector of the present invention will be described with reference to the accompanying drawings.
도 1에서와 같이 본 발명의 집전체용 언더코팅 잉크 제조 방법은 제1용매와 바인더를 혼합기를 이용해 대기압에서 25 내지 40rpm(revolution per minute)으로 20 내지 40분(minute) 동안 혼합하여 1차 혼합물을 형성하는 1차 혼합 단계(S10)를 수행한다. 1차 혼합 단계(S10)에서 1차 혼합물이 형성되면 1차 혼합물에 첨가제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 2차 혼합물을 형성하는 2차 혼합 단계(S20)를 수행한다. 2차 혼합 단계(S20)에서 2차 혼합물이 형성되면 2차 혼합물에 제2용매를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 3차 혼합물을 형성하는 3차 혼합 단계(S30)를 수행한다. 3차 혼합 단계(S30)에서 3차 혼합물이 형성되면 3차 혼합물에 도전제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 4차 혼합물을 형성하는 4차 혼합 단계(S40)를 수행한다. 4차 혼합 단계(S40)에서 4차 혼합물이 형성되면 4차 혼합물을 혼합기를 이용해 진공상태에서 2000 내지 3000rpm으로 100 내지 140분 동안 혼합하는 5차 혼합 단계(S50)를 수행한다. 5차 혼합 단계(S50)에서 5차 혼합이 완료되면 4차 혼합물을 혼합기를 이용해 진공상태에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하는 6차 혼합 단계(S60)를 수행하여 본 발명의 집전체용 언더코팅 잉크를 제조한다. As shown in FIG. 1 , in the method for manufacturing an undercoating ink for a current collector of the present invention, a first solvent and a binder are mixed at atmospheric pressure at 25 to 40 rpm (revolution per minute) at 25 to 40 rpm (revolution per minute) for 20 to 40 minutes (minute) using a mixer to form a primary mixture Perform a first mixing step (S10) to form a. When the first mixture is formed in the first mixing step (S10), a second mixing step of adding an additive to the first mixture and mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer to form a second mixture ( S20) is performed. When the secondary mixture is formed in the secondary mixing step (S20), a tertiary mixture is formed by adding a second solvent to the secondary mixture and mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer to form a tertiary mixture Step S30 is performed. When the tertiary mixture is formed in the tertiary mixing step (S30), a fourth mixing step of adding a conductive agent to the tertiary mixture and mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer to form a quaternary mixture (S40) is performed. When the fourth mixture is formed in the fourth mixing step (S40), a fifth mixing step (S50) of mixing the fourth mixture in a vacuum at 2000 to 3000 rpm for 100 to 140 minutes using a mixer is performed. When the fifth mixing is completed in the fifth mixing step (S50), the sixth mixing step (S60) of mixing the fourth mixture in a vacuum at 25 to 40 rpm for 20 to 40 minutes is performed using a mixer, and the current collector of the present invention undercoating ink for
본 발명의 집전체용 언더코팅 잉크 제조 방법의 구성을 상세히 설명하면 다음과 같다.The configuration of the method for manufacturing the undercoating ink for a current collector of the present invention will be described in detail as follows.
1차 혼합 단계(S10)는 제1용매와 바인더를 혼합기(도시 않음)를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 1차 혼합물을 형성하며, 1차 혼합물은 도 1에서와 같이 고르게 분산된 상태를 보이고 있다. 이러한 1차 혼합물은 제1용매 65 내지 80wt％와 바인더 20 내지 35wt％를 혼합하여 형성되고, 제1용매는 IPA(isopropyl alcohol)가 사용되며, 바인더는 키토산(chitosan)이나 폴리 아크릴산(poly acrylic acid)이 사용된다. 1차 혼합 단계(S10)에서 사용되는 혼합기는 플래너터리 믹서(planetary mixer)가 사용된다. In the first mixing step (S10), the first solvent and the binder are mixed using a mixer (not shown) at 25 to 40 rpm at atmospheric pressure for 20 to 40 minutes to form a first mixture, and the first mixture is It is evenly distributed. This primary mixture is formed by mixing 65 to 80 wt % of the first solvent and 20 to 35 wt % of the binder, IPA (isopropyl alcohol) is used as the first solvent, and the binder is chitosan or poly acrylic acid ) is used. As the mixer used in the first mixing step S10, a planetary mixer is used.
2차 혼합 단계(S20)는 1차 혼합 단계(S10)에서 1차 혼합물이 형성되면 1차 혼합물에 첨가제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 2차 혼합물을 형성하며, 도 1에서와 같이 2차 혼합물은 미량의 거품이 발생된 상태로 혼합되었다. 여기서, 2차 혼합물은 1차 혼합물 90 내지 99wt％와 첨가제 1 내지 10wt％를 혼합하여 형성되며, 첨가제는 MEK(metyl ethyl ketone)가 사용된다. 2차 혼합 단계(S20)에서 사용되는 혼합기는 플래너터리 믹서가 사용된다. In the second mixing step (S20), when the first mixture is formed in the first mixing step (S10), an additive is added to the first mixture and then mixed for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer at 25 to 40 rpm to the second mixture to form, and as shown in FIG. 1, the secondary mixture was mixed in a state in which a small amount of foam was generated. Here, the secondary mixture is formed by mixing 90 to 99 wt% of the primary mixture and 1 to 10 wt% of the additive, and MEK (metyl ethyl ketone) is used as the additive. As the mixer used in the secondary mixing step S20, a planetary mixer is used.
3차 혼합 단계(S30)는 2차 혼합 단계(S20)에서 2차 혼합물이 형성되면 2차 혼합물에 제2용매를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 3차 혼합물을 형성하며, 도 1에서와 같이 3차 혼합물은 미량의 거품이 발생되었다. 이러한 3차 혼합물은 2차 혼합물 85 내지 96wt％와 제2용매 4 내지 15wt％를 혼합하여 형성되며, 제2용매는 순수(H2O)가 사용된다. 3차 혼합 단계(S30)에서 사용되는 혼합기는 플래너터리 믹서가 사용된다. In the third mixing step (S30), when the second mixture is formed in the second mixing step (S20), a second solvent is added to the second mixture and then mixed for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer 3 A tea mixture was formed, and a small amount of foam was generated in the tertiary mixture as shown in FIG. 1 . This tertiary mixture is formed by mixing 85 to 96 wt% of the secondary mixture and 4 to 15 wt% of the second solvent, and pure water (H 2 O) is used as the second solvent. A planetary mixer is used as the mixer used in the third mixing step (S30).
4차 혼합 단계(S40)는 3차 혼합 단계(S30)에서 3차 혼합물이 형성되면 3차 혼합물에 도전제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 4차 혼합물을 형성하며, 도 1에서와 같이 4차 혼합물은 다량의 거품이 발생되고 분산 상태가 좋지 않은 상태로 혼합되었다. 4차 혼합물에서 거품이 발생되고 분산 상태가 좋지 않은 경우에 이를 이용해 집전체(도시 않음)에 4차 혼합물로 전처리시 집전체의 표면에 고르게 도포되지 않아 집전체와 4차 혼합물 사이의 접착력이 불균하게 전처리될 수 있다. 4차 혼합 단계(S40)에서 사용되는 혼합기는 플래너터리 믹서가 사용된다. In the fourth mixing step (S40), when the tertiary mixture is formed in the tertiary mixing step (S30), a conductive agent is added to the tertiary mixture, and then mixed for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer for 20 to 40 minutes. Forming a mixture, as shown in FIG. 1, the quaternary mixture was mixed in a state where a large amount of foam was generated and the dispersion state was not good. When bubbles are generated in the quaternary mixture and the dispersion state is not good, it is not evenly applied to the surface of the current collector when pre-treated with the quaternary mixture on the current collector (not shown), so the adhesive force between the current collector and the quaternary mixture is uneven can be pre-treated. As the mixer used in the fourth mixing step S40, a planetary mixer is used.
4차 혼합 단계(S40)에서 형성된 4차 혼합물은 3차 혼합물 85 내지 96wt％와 도전제 4 내지 15wt％를 혼합하여 형성되며, 도전제는 케첸블랙(ketjen black), 아세틸렌블랙(acetylene black)이나 덴카블랙(denka black)이 사용된다. 즉, 4차 혼합물은 제1용매 60 내지 72wt％와 바인더 18 내지 23wt％와 첨가제 1 내지 3wt％와 제2용매 4 내지 7wt％와 도전제 5 내지 7wt％를 혼합하여 형성된다. 5차 혼합 단계(S50)에서 사용되는 혼합기는 플래너터리 믹서(planetary mixer)나 플래너터리 디스퍼 믹서(planetary disper mixer)가 사용된다. The quaternary mixture formed in the fourth mixing step (S40) is formed by mixing 85 to 96 wt% of the tertiary mixture and 4 to 15 wt% of the conductive agent, and the conductive agent is ketjen black, acetylene black, or Denka black is used. That is, the quaternary mixture is formed by mixing 60 to 72 wt% of the first solvent, 18 to 23 wt% of the binder, 1 to 3 wt% of the additive, 4 to 7 wt% of the second solvent, and 5 to 7 wt% of the conductive agent. As the mixer used in the fifth mixing step (S50), a planetary mixer or a planetary disper mixer is used.
5차 혼합 단계(S50)는 4차 혼합 단계(S40)에서 4차 혼합물이 형성되면 4차 혼합물을 혼합기를 이용해 진공상태에서 2000 내지 3000rpm으로 100 내지 140분 동안 혼합하며, 5차 혼합 단계(S50)는 도 1에서와 같이 미량의 거품은 발생되었으나 4차 혼합물이 분산된 상태로 혼합되었다. 5차 혼합 단계(S50)는 4차 혼합물을 진공 상태로 혼합함으로써 진공 탈포하여 거품을 제거하며, 진공 상태는 0.1 내지 0.9 Torr로 설정된다. In the fifth mixing step (S50), when the fourth mixture is formed in the fourth mixing step (S40), the fourth mixture is mixed in a vacuum at 2000 to 3000 rpm for 100 to 140 minutes using a mixer, and the fifth mixing step (S50) ), as in FIG. 1, a small amount of foam was generated, but the quaternary mixture was mixed in a dispersed state. The fifth mixing step (S50) removes bubbles by vacuum defoaming by mixing the fourth mixture in a vacuum state, and the vacuum state is set to 0.1 to 0.9 Torr.
5차 혼합 단계(S50)는 4차 혼합물에 가교제를 혼합한다. 즉, 5차 혼합 단계(S50)는 4차 혼합물 99.1 내지 99.9wt％와 가교제 0.1 내지 0.9wt％를 혼합하여 5차 혼합물을 형성하며, 가교제는 PPMA(propylene glycol methyl ether acetate)가 사용된다. 이와 같이 가교제는 4차 혼합물 99.1 내지 99.9wt％에 대해 0.1 내지 0.9wt％로 미량이 되도록 혼합함으로써 본 발명으로 제조된 언더코팅된 잉크를 이용해 전처리 시 전처리된 부분의 기계적 강도나 화학적 안정성을 개선함과 아울러 집전체(도시 않음)와 언더코팅된 잉크 사이의 접착력이 지나치게 증가되는 것을 방지한다. 예를 들어, 언더코팅된 잉크의 접착력이 지나치게 큰 경우에 집전체에 리드(도시 않음)를 연결하기 위해 언더코팅?? 잉크를 제거 시 제거 작업이 용이하지 않을 수 있다. 여기서, 혼합기는 플래너터리 믹서(planetary mixer)나 플래너터리 디스퍼 믹서(planetary disper mixer)가 사용된다. In the fifth mixing step (S50), a crosslinking agent is mixed in the fourth mixture. That is, in the fifth mixing step (S50), 99.1 to 99.9 wt% of the quaternary mixture and 0.1 to 0.9 wt% of a crosslinking agent are mixed to form a fifth mixture, and propylene glycol methyl ether acetate (PPMA) is used as the crosslinking agent. As such, the crosslinking agent is mixed so as to be in a trace amount of 0.1 to 0.9 wt% with respect to 99.1 to 99.9 wt% of the quaternary mixture, thereby improving the mechanical strength or chemical stability of the pretreated portion during pretreatment using the undercoated ink prepared according to the present invention. In addition, the adhesive force between the current collector (not shown) and the undercoated ink is prevented from being excessively increased. For example, undercoating to connect a lead (not shown) to the current collector when the adhesion of the undercoated ink is too great. When removing the ink, the removal operation may not be easy. Here, as the mixer, a planetary mixer or a planetary disper mixer is used.
6차 혼합 단계(S60)는 5차 혼합 단계(S50)에서 5차 혼합이 완료되면 4차 혼합물을 혼합기를 이용해 진공상태에서 25 내지 40rpm으로 20 내지 40분 동안 혼합을 수행하여 본 발명의 집전체용 언더코팅 잉크를 제조한다. 즉, 도 1에서와 같이 5차 혼합된 4차 혼합물을 진공 상태로 혼합함으로써 진공 탈포함에 의해 5차 혼합 단계(S50)에서 발생된 미소량의 거품을 제거하며, 진공 상태는 5차 혼합 단계(S50)에서와 같이 0.1 내지 0.9 Torr로 설정된다. 6차 혼합 단계(S60)에서 사용되는 혼합기는 플래너터리 믹서나 플래너터리 디스퍼 믹서가 사용된다. In the sixth mixing step (S60), when the fifth mixing is completed in the fifth mixing step (S50), the fourth mixture is mixed in a vacuum at 25 to 40 rpm for 20 to 40 minutes using a mixer, and the current collector of the present invention undercoating ink for That is, as in FIG. 1, by mixing the fifth mixed quaternary mixture in a vacuum state, a small amount of bubbles generated in the fifth mixing step (S50) by vacuum degassing is removed, and the vacuum state is the fifth mixing step It is set to 0.1 to 0.9 Torr as in (S50). As the mixer used in the sixth mixing step S60, a planetary mixer or a planetary disper mixer is used.
본 발명의 집전체용 언더코팅 잉크 제조 방법에 의해 제조된 집전체용 언더코팅 잉크의 박리 시험을 수행하였다.A peel test of the undercoating ink for a current collector prepared by the method for manufacturing the undercoating ink for a current collector of the present invention was performed.
박리 시험을 위해 본 발명의 제1실시예에 따른 집전체용 언더코팅 잉크를 제조하였다. 본 발명의 제1실시예에 따른 언더코팅 잉크의 제조는 먼저, 제1용매로 IPA 65wt％와 바인더로 폴리 아크릴산 35wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 1차 혼합물을 형성하였다. 1차 혼합물을 형성한 후 1차 혼합물 90wt％와 첨가제로 MEK 10wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 2차 혼합물을 형성하였다. 2차 혼합물을 형성한 후 2차 혼합물 85wt％와 제2용매로 순수(H2O) 15wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 3차 혼합물을 형성하였으며, 1 내지 3차 혼합물을 제조하는 과정에서 각각 미량의 거품이 발생되었다. For the peel test, an undercoating ink for a current collector according to Example 1 of the present invention was prepared. In the preparation of the undercoating ink according to the first embodiment of the present invention, first, 65wt% of IPA as a first solvent and 35wt% of polyacrylic acid as a binder were mixed using a planetary mixer at atmospheric pressure at 25rpm for 20 minutes to prepare a first mixture. formed. After forming the primary mixture, 90 wt% of the primary mixture and 10 wt% of MEK as an additive were mixed using a planetary mixer at atmospheric pressure at 25 rpm for 20 minutes to form a secondary mixture. After forming the secondary mixture, 85 wt% of the secondary mixture and 15 wt% of pure water (H 2 O) as a second solvent were mixed using a planetary mixer at 25 rpm at atmospheric pressure for 20 minutes to form a tertiary mixture, 1 to 3 In the process of preparing the tea mixture, each trace of foam was generated.
본 발명의 제1실시예에 따른 3차 혼합물을 형성한 후 3차 혼합물 85wt％와 도전제로 아세틸렌블랙 15wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 4차 혼합물을 형성하였다. 즉, 4차 혼합물은 제1용매 60wt％, 바인더 23wt％, 첨가제 3wt％, 제2용매 7wt％ 및 도전제 7wt％를 혼합하여 형성하였으며, 혼합 상태는 다량의 거품이 발생되고 분산 상태가 좋지 않게 혼합되었다. 4차 혼합물을 형성한 후 플래너터리 디스퍼 믹서를 이용해 진공을 0.1 Torr로 설정한 상태에서 2000rpm으로 100분 동안 혼합하였으나 미소량의 거품이 발생되어 다시 플래너터리 디스퍼 믹서를 이용해 진공을 0.1 Torr로 설정한 상태에서 25rpm으로 20분 동안 혼합하여 미소량의 거품을 제거하여 본 발명의 집전체용 언더코팅 잉크의 제1실시예를 제조하였다. 본 발명의 제1실시예에 따라 제조된 집전체용 언더코팅 잉크는 PPMA와 같은 가교제를 혼합하지 않은 상태에서 제조하였다. After forming the tertiary mixture according to the first embodiment of the present invention, 85 wt% of the tertiary mixture and 15 wt% of acetylene black as a conductive agent were mixed using a planetary mixer at atmospheric pressure at 25 rpm for 20 minutes to form a quaternary mixture. That is, the quaternary mixture was formed by mixing 60wt% of the first solvent, 23wt% of the binder, 3wt% of the additive, 7wt% of the second solvent, and 7wt% of the conductive agent. mixed After forming the quaternary mixture, the vacuum was set to 0.1 Torr using a planetary disper mixer and mixed at 2000 rpm for 100 minutes at 2000 rpm, but a small amount of bubbles were generated, and the vacuum was again reduced to 0.1 Torr using a planetary disper mixer. A first example of the undercoating ink for a current collector of the present invention was prepared by mixing at 25 rpm for 20 minutes in the set state to remove a small amount of bubbles. The undercoating ink for a current collector prepared according to the first embodiment of the present invention was prepared without mixing a crosslinking agent such as PPMA.
본 발명의 제1실시예에 따라 제조된 집전체용 언더코팅 잉크의 박리 시험은 먼저, 두께가 21㎛인 알루미늄 포일이 사용되는 집전체의 표면에 제1실시예로 제조된 잉크를 두께가 3㎛가 되도록 언더코팅하여 3개의 샘플을 준비했다. 언더코팅은 집전체의 표면에 전극 활물질을 도포하기 전에 잉크를 코팅하는 것으로, 로딩양(g/㎠)을 0.0021±1 g/㎠가 되도록 정밀하게 제어하여 언더코팅하였다. 언더코팅된 3개의 샘플이 준비되면 각각을 도 2에서와 같이 120℃, 150℃ 및 180℃에서 각각 10mim(mimute: 분) 동안 건조하였다. 건조된 3개의 샘플의 박리 시험은 NMP(N-methyl-2-pyrrolidone)을 묻힌 면봉솜으로 언더코팅된 표면을 약 30 내지 50회 문질러 수행 했다. 박리 시험 결과는 도 2에 도시된 120℃, 150℃ 및 180℃에서 각각 10mim(분) 동안 건조된 3개의 샘플에서와 같이 본 발명의 제1실시예에 따라 제조되어 언더코팅된 잉크가 깨끗하게 제거됨으로써 집전체에 리드를 연결하는 작업 시 언더코팅된 잉크를 용이하게 제거할 수 있게 된다. 여기서, 도 2에 도시된 언더코팅된 3개의 집전체 샘플에서 어우둔 색 부분은 언더코팅된 부분을 나타내며, 밝은 색부분은 언더코팅된 잉크가 면봉솜으로 제거된 부분으로 집전체의 표면을 나타낸다.In the peeling test of the undercoating ink for the current collector prepared according to the first embodiment of the present invention, first, the ink prepared in the first embodiment was applied to the surface of the current collector in which an aluminum foil having a thickness of 21 μm was used. Three samples were prepared by undercoating to ㎛. Undercoating is coating the ink before applying the electrode active material to the surface of the current collector, and the undercoating was performed by precisely controlling the loading amount (g/cm2) to be 0.0021±1 g/cm2. When the three undercoated samples were prepared, each was dried at 120° C., 150° C. and 180° C. for 10 mim (mimute: min), respectively, as shown in FIG. 2 . The peel test of the three dried samples was performed by rubbing the undercoated surface about 30 to 50 times with a cotton swab dipped in N-methyl-2-pyrrolidone (NMP). The peel test results were prepared according to the first embodiment of the present invention as in the three samples dried for 10 mim (minutes) at 120° C., 150° C. and 180° C., respectively, as shown in FIG. 2 to cleanly remove the undercoated ink. This makes it possible to easily remove the undercoated ink when connecting the lead to the current collector. Here, in the three undercoated current collector samples shown in FIG. 2 , the dark colored part represents the undercoated part, and the light colored part represents the part where the undercoated ink was removed with a cotton swab and represents the surface of the current collector. .
박리 시험을 위한 본 발명의 제2실시예에 따른 집전체용 언더코팅 잉크의 제조는 먼저, 제1용매로 IPA 80wt％와 바인더로 폴리 아크릴산 20wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 1차 혼합물을 형성하였다. 1차 혼합물을 형성한 후 1차 혼합물 99wt％와 첨가제로 MEK 1wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 2차 혼합물을 형성하였다. 2차 혼합물을 형성한 후 2차 혼합물 96wt％와 제2용매로 순수(H2O) 4wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 3차 혼합물을 형성하였으며, 1 내지 3차 혼합물을 제조하는 과정에서 각각 미량의 거품이 발생되었다. Preparation of the undercoating ink for the current collector according to the second embodiment of the present invention for the peeling test is first, 80wt% of IPA as a first solvent and 20wt% of polyacrylic acid as a binder using a planetary mixer at atmospheric pressure at 40rpm for 40 minutes Mixed for a while to form a first mixture. After forming the primary mixture, 99wt% of the primary mixture and 1wt% of MEK as an additive were mixed using a planetary mixer at atmospheric pressure at 40rpm for 40 minutes to form a secondary mixture. After forming the secondary mixture, 96wt% of the secondary mixture and 4wt% of pure water (H 2 O) as the second solvent were mixed using a planetary mixer at atmospheric pressure at 40rpm for 40 minutes to form a tertiary mixture, 1 to 3 In the process of preparing the tea mixture, each trace of foam was generated.
본 발명의 제2실시예에 따른 3차 혼합물을 형성한 후 3차 혼합물 96wt％와 도전제로 아세틸렌블랙 4wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 4차 혼합물을 형성하였다. 즉, 4차 혼합물은 제1용매 72wt％, 바인더 18wt％, 첨가제 1wt％, 제2용매 4wt％ 및 도전제 5wt％를 혼합하여 형성하였으며, 혼합 상태는 다량의 거품이 발생되고 분산 상태가 좋지 않게 혼합되었다. 4차 혼합물을 형성한 후 플래너터리 디스퍼 믹서를 이용해 진공을 0.9 Torr로 설정한 상태에서 3000rpm으로 140분 동안 혼합하였으나 미소량의 거품이 발생되었다. 거품을 제거하기 위해 다시 플래너터리 디스퍼 믹서를 이용해 진공을 0.9 Torr로 설정한 상태에서 40rpm으로 40분 동안 혼합하여 미소량의 거품을 제거하여 본 발명의 집전체용 언더코팅 잉크의 제2실시예를 제조하였으며, 제2실시예에 따른 잉크 는 PPMA와 같은 가교제를 첨가하지 않은 상태로 제조되었다. After forming the tertiary mixture according to the second embodiment of the present invention, 96 wt% of the tertiary mixture and 4 wt% of acetylene black as a conductive agent were mixed using a planetary mixer at atmospheric pressure at 40 rpm for 40 minutes to form a quaternary mixture. That is, the quaternary mixture was formed by mixing 72wt% of the first solvent, 18wt% of the binder, 1wt% of the additive, 4wt% of the second solvent, and 5wt% of the conductive agent. mixed After forming the quaternary mixture, using a planetary disper mixer, the vacuum was set to 0.9 Torr, and the mixture was mixed at 3000 rpm for 140 minutes, but a small amount of bubbles were generated. In order to remove the bubbles, the second embodiment of the undercoating ink for the current collector of the present invention by using a planetary disper mixer again to remove a small amount of bubbles by mixing at 40 rpm for 40 minutes in a state where the vacuum is set to 0.9 Torr was prepared, and the ink according to Example 2 was prepared without adding a crosslinking agent such as PPMA.
본 발명의 제2실시예로 제조된 집전체용 언더코팅 잉크의 박리 시험은 제2실시예로 제조된 잉크를 두께가 21㎛인 알루미늄 포일이 사용되는 집전체의 표면에 두께가 3㎛가 되도록 언더코팅하여 3개의 샘플을 제조하였다. 언더코팅의 로딩양(g/㎠)은 0.0021±1 g/㎠가 되도록 정밀하게 제어하여 언더코팅하였다. 3개의 샘플을 제조한 후 각각은 도 2에서와 같이 120℃, 150℃ 및 180℃에서 각각 20mim 동안 건조하였다. 건조된 6개의 샘플의 박리 시험은 NMP을 묻힌 면봉솜으로 잉크로 언더코팅된 표면을 약 30 내지 50회 문질러 박리 시험을 했으며, 박리 시험 결과는 도 2에서 120℃, 150℃ 및 180℃에서 각각 20mim 동안 건조된 3개의 샘플에서와 같이 언더코팅된 면이 깨끗하게 제거되었다. 이러한 박리 시험 결과로 보아 표면이 언더코팅된 집전체에 리드를 연결하는 작업 시 언더코팅된 잉크를 보다 용이하게 제거할 수 있게 됨에 따라 리드 연결 작업을 용이하게 수행할 수 있다.In the peeling test of the undercoating ink for the current collector prepared in Example 2 of the present invention, the ink prepared in Example 2 was applied to a thickness of 3 μm on the surface of the current collector using an aluminum foil having a thickness of 21 μm. Three samples were prepared by undercoating. Undercoating was performed by precisely controlling the loading amount (g/cm 2 ) of the undercoat to be 0.0021±1 g/cm 2 . After preparing three samples, each was dried at 120° C., 150° C. and 180° C. for 20 mim, respectively, as in FIG. 2 . For the peel test of the six dried samples, the peel test was performed by rubbing the undercoated surface with ink about 30 to 50 times with a cotton swab dipped in NMP, and the peel test results were shown in FIG. 2 at 120°C, 150°C and 180°C, respectively. The undercoated side was cleanly removed as in the three samples dried for 20 mim. As a result of the peel test, it is possible to more easily remove the under-coated ink during the operation of connecting the lead to the current collector whose surface is undercoated, so that the lead connection operation can be easily performed.
박리 시험을 위한 본 발명의 제3실시예에 따른 집전체용 언더코팅 잉크의 제조는 먼저, 제1용매로 IPA 65wt％와 바인더로 폴리 아크릴산 35wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 1차 혼합물을 형성하였다. 1차 혼합물을 형성한 후 1차 혼합물 90wt％와 첨가제로 MEK 10wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 2차 혼합물을 형성하였다. 2차 혼합물을 형성한 후 2차 혼합물 85wt％와 제2용매로 순수(H2O) 15wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 3차 혼합물을 형성하였으며, 제1 및 제2실시예에서와 같이 제3실시예에서도 1 내지 3차 혼합물을 제조하는 과정에서 각각 미량의 거품이 발생되었다. Preparation of the undercoating ink for the current collector according to the third embodiment of the present invention for the peel test is first, 65wt% of IPA as the first solvent and 35wt% of polyacrylic acid as the binder using a planetary mixer at atmospheric pressure at 25rpm for 20 minutes Mixed for a while to form a first mixture. After forming the primary mixture, 90 wt% of the primary mixture and 10 wt% of MEK as an additive were mixed using a planetary mixer at atmospheric pressure at 25 rpm for 20 minutes to form a secondary mixture. After forming the secondary mixture, 85 wt% of the secondary mixture and 15 wt% of pure water (H 2 O) as the second solvent were mixed using a planetary mixer at 25 rpm at atmospheric pressure for 20 minutes to form a tertiary mixture, the first and As in Example 2, in Example 3, a small amount of foam was generated in the process of preparing the first to third mixtures, respectively.
본 발명의 제3실시예에 따른 3차 혼합물을 형성한 후 3차 혼합물 85wt％와 도전제로 아세틸렌블랙 15wt％를 플래너터리 믹서를 이용해 대기압에서 25rpm으로 20분 동안 혼합하여 4차 혼합물을 형성하였다. 즉, 4차 혼합물은 제1용매 60wt％, 바인더 23wt％, 첨가제 3wt％, 제2용매 7wt％ 및 도전제 7wt％를 혼합하여 형성하였으며, 혼합 상태는 다량의 거품이 발생되고 분산 상태가 좋지 않게 혼합되었다. 4차 혼합물을 형성한 후 4차 혼합물 99.9wt％와 가교제로 PPMA 0.1wt％를 플래너터리 디스퍼 믹서를 이용해 진공을 0.1 Torr로 설정한 상태에서 2000rpm으로 100분 동안 혼합하였으나 미소량의 거품이 발생되었다. 거품을 제거하기 위해 다시 플래너터리 디스퍼 믹서를 이용해 진공을 0.1 Torr로 설정한 상태에서 25rpm으로 20분 동안 혼합하여 미소량의 거품을 제거하여 본 발명의 집전체용 언더코팅 잉크의 제3실시예를 제조하였다. 즉, 본 발명의 제3실시예에 따라 제조된 집전체용 언더코팅 잉크는 PPMA와 같은 가교제를 극소량 혼합하여 제조하였다. After forming the tertiary mixture according to the third embodiment of the present invention, 85 wt% of the tertiary mixture and 15 wt% of acetylene black as a conductive agent were mixed using a planetary mixer at atmospheric pressure at 25 rpm for 20 minutes to form a quaternary mixture. That is, the quaternary mixture was formed by mixing 60wt% of the first solvent, 23wt% of the binder, 3wt% of the additive, 7wt% of the second solvent, and 7wt% of the conductive agent. mixed After forming the quaternary mixture, 99.9wt% of the quaternary mixture and 0.1wt% of PPMA as a crosslinking agent were mixed using a planetary disper mixer at a vacuum setting of 0.1 Torr at 2000rpm for 100 minutes, but a small amount of foam was generated. became In order to remove the bubbles, the third embodiment of the undercoating ink for the current collector of the present invention by using a planetary disper mixer again to remove a small amount of bubbles by mixing at 25 rpm for 20 minutes in a state where the vacuum is set to 0.1 Torr was prepared. That is, the undercoating ink for the current collector prepared according to the third embodiment of the present invention was prepared by mixing a very small amount of a crosslinking agent such as PPMA.
본 발명의 제3실시예로 제조된 집전체용 언더코팅 잉크의 박리 시험을 위해 3개의 샘플을 제조하였다. 3개의 샘플은 각각 제3실시예로 제조된 잉크를 두께가 21㎛인 알루미늄 포일이 사용되는 집전체의 표면에 두께가 3㎛가 되도록 언더코팅을 했다. 여기서, 언더코팅은 로딩양(g/㎠)은 0.0021±1 g/㎠가 되도록 정밀하게 제어하여 3개의 샘플을 제조하였으며, 각각은 도 2에서와 같이 120℃, 150℃ 및 180℃에서 각각 30mim(분) 동안 건조하였다. 건조된 3개의 샘플의 박리 시험은 NMP(N-methyl-2-pyrrolidone)을 묻힌 면봉솜으로 언더코팅된 표면을 약 30 내지 50회 문질러 박리 시험을 했으며, 박리 시험 결과는 도 2에서 120℃, 150℃ 및 180℃에서 각각 30mim 동안 건조된 3개의 샘플에서와 같이 언더코팅된 면이 깨끗하게 제거되었다. 이러한 박리 시험 결과에서와 같이 언더코팅된 집전체에 리드를 연결하는 작업 시 언더코팅된 잉크를 보다 용이하게 제거할 수 있게 됨에 따라 집전체에 리드 연결 작업을 보다 용이하게 수행할 수 있으며, 가교제를 극소량 첨부함에 따라 가교제에 의해 건조된 잉크의 경도가 개선됨을 알 수 있다. Three samples were prepared for the peel test of the undercoating ink for the current collector prepared in Example 3 of the present invention. In each of the three samples, the ink prepared in Example 3 was under-coated to a thickness of 3 μm on the surface of a current collector using an aluminum foil having a thickness of 21 μm. Here, three samples were prepared by precisely controlling the loading amount (g/cm2) of the undercoating to be 0.0021±1 g/cm2, and each was 30 mim at 120°C, 150°C and 180°C, respectively, as shown in FIG. 2 . (minutes) to dry. The peel test of the three dried samples was performed by rubbing the undercoated surface about 30 to 50 times with a cotton swab dipped in N-methyl-2-pyrrolidone (NMP). The undercoated side was cleanly removed as in the three samples dried at 150°C and 180°C for 30 mim each. As in the peel test results, when the lead is connected to the undercoated current collector, the undercoated ink can be more easily removed, so that the lead connection to the current collector can be performed more easily, and a crosslinking agent is added. It can be seen that the hardness of the dried ink is improved by the crosslinking agent as a very small amount is added.
박리 시험을 위한 본 발명의 제4실시예에 따른 집전체용 언더코팅 잉크는 먼저, 제1용매로 IPA 80wt％와 바인더로 폴리 아크릴산 20wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 1차 혼합물을 형성하였다. 1차 혼합물을 형성한 후 1차 혼합물 99wt％와 첨가제로 MEK 1wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 2차 혼합물을 형성하였다. 2차 혼합물을 형성한 후 2차 혼합물 96wt％와 제2용매로 순수(H2O) 4wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 3차 혼합물을 형성하였으며, 1 내지 3차 혼합물을 제조하는 과정에서 각각 미량의 거품이 발생되었다. The undercoating ink for a current collector according to Example 4 of the present invention for the peel test was first mixed with 80 wt% of IPA as a first solvent and 20 wt% of polyacrylic acid as a binder at 40 rpm at atmospheric pressure using a planetary mixer for 40 minutes. to form a first mixture. After forming the primary mixture, 99wt% of the primary mixture and 1wt% of MEK as an additive were mixed using a planetary mixer at atmospheric pressure at 40rpm for 40 minutes to form a secondary mixture. After forming the secondary mixture, 96wt% of the secondary mixture and 4wt% of pure water (H 2 O) as the second solvent were mixed using a planetary mixer at atmospheric pressure at 40rpm for 40 minutes to form a tertiary mixture, 1 to 3 In the process of preparing the tea mixture, each trace of foam was generated.
본 발명의 제4실시예에 따른 3차 혼합물을 형성한 후 3차 혼합물 96wt％와 도전제로 아세틸렌블랙 4wt％를 플래너터리 믹서를 이용해 대기압에서 40rpm으로 40분 동안 혼합하여 4차 혼합물을 형성하였다. 즉, 4차 혼합물은 제1용매 72wt％, 바인더 18wt％, 첨가제 1wt％, 제2용매 4wt％ 및 도전제 5wt％를 혼합하여 형성하였으며, 혼합 상태는 다량의 거품이 발생되고 분산 상태가 좋지 않게 혼합되었다. 4차 혼합물을 형성한 후 4차 혼합물 99.1wt％와 가교제로 PPMA 0.9wt％를 플래너터리 디스퍼 믹서를 이용해 진공을 0.9 Torr로 설정한 상태에서 3000rpm으로 140분 동안 혼합하였으나 미소량의 거품이 발생되었다. 거품을 제거하기 위해 다시 플래너터리 디스퍼 믹서를 이용해 진공을 0.9 Torr로 설정한 상태에서 40rpm으로 40분 동안 혼합하여 미소량의 거품을 제거하여 본 발명의 집전체용 언더코팅 잉크의 제4실시예를 제조하였다. After forming the tertiary mixture according to the fourth embodiment of the present invention, 96 wt% of the tertiary mixture and 4 wt% of acetylene black as a conductive agent were mixed using a planetary mixer at atmospheric pressure at 40 rpm for 40 minutes to form a quaternary mixture. That is, the quaternary mixture was formed by mixing 72wt% of the first solvent, 18wt% of the binder, 1wt% of the additive, 4wt% of the second solvent, and 5wt% of the conductive agent. mixed After forming the quaternary mixture, 99.1wt% of the quaternary mixture and 0.9wt% of PPMA as a crosslinking agent were mixed using a planetary disper mixer at a vacuum setting of 0.9 Torr at 3000rpm for 140 minutes, but a small amount of foam was generated. became In order to remove the bubbles again, using a planetary disper mixer, the vacuum was set to 0.9 Torr, and the mixture was mixed at 40 rpm for 40 minutes to remove a small amount of bubbles. The fourth embodiment of the undercoating ink for a current collector of the present invention was prepared.
본 발명의 제4실시예로 제조된 집전체용 언더코팅 잉크의 박리 시험을 위해 먼저, 제4실시예로 제조된 잉크를 두께가 21㎛인 알루미늄 포일이 사용되는 집전체의 표면에 두께가 3㎛가 되도록 언더코팅하여 6개의 샘플을 준비하였다. 여기서, 6개의 샘플은 각각 로딩양(g/㎠)이 0.0021±1 g/㎠가 되도록 정밀하게 제어하여 언더코팅하여 제조하였으며, 각각은 도 2에서와 같이 120℃, 150℃ 및 180℃에서 각각 60mim 및 2hrs(hours: 시간)동안 건조하였다. 건조된 6개의 샘플의 박리 시험은 NMP을 묻힌 면봉솜으로 잉크로 언더코팅된 표면을 약 30 내지 50회 문질러 박리 시험을 했으며, 박리 시험 결과는 도 2에서 120℃, 150℃ 및 180℃에서 각각 60mim 및 2hrs 동안 건조된 6개의 샘플에서와 같이 언더코팅된 면이 깨끗하게 제거되었다. 이러한 박리 시험 결과에서와 같이, 표면이 언더코팅된 집전체에 리드를 연결하는 작업 시 언더코팅된 잉크를 보다 용이하게 제거할 수 있게 됨에 따라 리드 연결 작업이 용이해지며, 가교제를 미량 첨가함으로써 건조된 잉크의 경도를 개선시킬 수 있었다.For the peeling test of the undercoating ink for the current collector prepared in Example 4 of the present invention, first, the ink prepared in Example 4 was applied to the surface of the current collector in which an aluminum foil having a thickness of 21 μm was used. Six samples were prepared by undercoating to ㎛. Here, six samples were prepared by undercoating by precisely controlling the loading amount (g/cm2) to be 0.0021±1 g/cm2, respectively, at 120°C, 150°C and 180°C, respectively, as shown in FIG. 2 . It was dried for 60 mim and 2 hrs (hours). For the peel test of the six dried samples, the peel test was performed by rubbing the undercoated surface with ink about 30 to 50 times with a cotton swab dipped in NMP, and the peel test results were shown in FIG. 2 at 120°C, 150°C and 180°C, respectively. The undercoated side was cleanly removed as in the 6 samples dried for 60 mim and 2 hrs. As in the peel test results, when the lead is connected to the current collector whose surface is undercoated, the undercoated ink can be more easily removed, making the lead connection easier and drying by adding a small amount of a crosslinking agent. It was possible to improve the hardness of the used ink.
본 발명의 제1 내지 제4실시예와 비교하기 위한 비교예에 따른 언더코팅용 잉크를 제조하였다. 비교예에 따른 언더코팅용 잉크는 공지된 제조방법으로 제조했으며, 재질은 바인더로 키토산(chitosan) 25wt％, 첨가제로 MA(maleic anhydride) 16.7wt％, 도전제로 덴카 블랙(denka black) 33.3wt％ 및 가교제로 PMA 25wt％가 되도록 형성하였다. 비교예에 따른 언더코팅된 잉크가 제조되면 비교예 따른 잉크를 실시예1 내지 4에서와 같이 두께가 21㎛인 알루미늄 포일이 사용되는 집전체의 표면에 두께가 3㎛가 되도록 언더코팅하여 12개의 샘플을 제조하였으며, 각각은 도 3에서와 같이 120℃, 150℃ 및 180℃에서 각각 10min, 20min, 30min 및 2hrs(hours: 시간)동안 건조하였다. 건조된 12개의 샘플의 박리 시험은 NMP을 묻힌 면봉솜으로 잉크로 언더코팅된 표면을 약 30 내지 50회 문질러 박리 시험을 했다. 박리 시험 결과는 도 3에서 120℃, 150℃ 및 180℃에서 각각 10min, 20min, 30min 및 2hrs 동안 건조된 12개의 샘플에서와 같이 가교제로 PMA가 25wt％로 많이 혼합됨으로 인해 비교예에 따른 잉크의 경도가 커지게 된다. 이로 인해 비교예에 따른 잉크의 제거 시 도 2와 비교해 도 3에서와 같이 언더코팅된 면이 깨끗하게 제거되지 않았으며, 도 3에 도시된 12개의 샘플에서 각각 밝은 부분은 면봉솜으로 제거되어 나타난 집전체의 표면이며, 어두운 색은 비교예에 따라 제조된 잉크를 나타낸다. 또한 전술한 박리 시험은 동일한 사람이 면봉솜을 동일한 힘으로 문지르도록 하였다. Inks for undercoating according to Comparative Examples for comparison with Examples 1 to 4 of the present invention were prepared. The ink for undercoating according to the comparative example was prepared by a known manufacturing method, and the material was chitosan 25wt% as a binder, MA (maleic anhydride) 16.7wt% as an additive, and denka black 33.3wt% as a conductive agent and PMA 25wt% as a crosslinking agent. When the under-coated ink according to the comparative example was prepared, the ink according to the comparative example was under-coated to a thickness of 3 µm on the surface of the current collector in which an aluminum foil having a thickness of 21 µm was used as in Examples 1 to 4. Samples were prepared, and each was dried at 120° C., 150° C. and 180° C. for 10 min, 20 min, 30 min and 2 hrs (hours), respectively, as shown in FIG. 3 . The peel test of 12 dried samples was performed by rubbing the undercoated surface with ink about 30 to 50 times with a cotton swab dipped in NMP. The peel test results show that in Fig. 3, PMA is mixed as a crosslinking agent as much as 25 wt% as in 12 samples dried for 10 min, 20 min, 30 min, and 2 hrs at 120 ° C, 150 ° C and 180 ° C, respectively. hardness increases. For this reason, when removing the ink according to the comparative example, the undercoated surface was not removed cleanly as in FIG. 3 compared to FIG. 2, and the bright portions in each of the 12 samples shown in FIG. 3 were removed with a cotton swab. It is the entire surface, and the dark color represents the ink prepared according to the comparative example. Also, in the peel test described above, the same person rubbed the cotton swab with the same force.
이상에서 설명한 바와 같이 본 발명의 집전체용 언더코팅 잉크 제조 방법은 가교제를 첨가하지 않거나 미량만을 첨가함으로서 집전체와 활물질 사이의 접착력 개선을 위해 언더코팅된 잉크를 부분적으로 용이하게 제거할 수 있는 있으며, 집전체에 언더코팅된 잉크를 부분적으로 용이하게 제거할 수 있도록 함으로써 언더코팅된 잉크로 인한 접합 작업의 불량을 방지하여 집전체에 리드를 용이하게 연결할 수 있게 된다. As described above, in the method for manufacturing the undercoating ink for a current collector of the present invention, the undercoating ink can be partially easily removed to improve adhesion between the current collector and the active material by adding no or only a small amount of a crosslinking agent. , by making it possible to partially and easily remove the undercoated ink on the current collector, it is possible to prevent a defect in bonding operation due to the undercoated ink, thereby making it possible to easily connect the lead to the current collector.
본 발명의 집전체용 언더코팅 잉크 제조 방법은 고전압 및 고용량의 슈퍼 커패시터 제조 산업 분야에 적용할 수 있다.The method for manufacturing an undercoating ink for a current collector of the present invention can be applied to a high-voltage and high-capacity supercapacitor manufacturing industry.
Claims (6)
상기 1차 혼합물에 첨가제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 2차 혼합물을 형성하는 2차 혼합 단계;
상기 2차 혼합물에 제2용매를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 3차 혼합물을 형성하는 3차 혼합 단계;
상기 3차 혼합물에 도전제를 투입한 후 혼합기를 이용해 대기압에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하여 4차 혼합물을 형성하는 4차 혼합 단계;
상기 4차 혼합물을 혼합기를 이용해 진공상태에서 2000 내지 3000rpm으로 100 내지 140분 동안 혼합하는 5차 혼합 단계; 및
상기 5차 혼합이 완료되면 상기 4차 혼합물을 혼합기를 이용해 진공상태에서 25 내지 40rpm으로 20 내지 40분 동안 혼합하는 6차 혼합 단계를 포함하며,
상기 1차 혼합 단계에서 상기 제1용매는 IPA(isopropyl alcohol)가 사용되며 상기 바인더는 키토산(chitosan)이나 폴리 아크릴산(poly acrylic acid)이 사용되고, 상기 2차 혼합 단계에서 상기 첨가제는 MEK(metyl ethyl ketone)가 사용되며, 상기 제3차 혼합 단계에서 상기 제2용매는 순수(H2O)가 사용되며, 상기 제4차 혼합 단계에서 상기 도전제는 케첸블랙(ketjen black), 아세틸렌블랙(acetylene black)이나 덴카블랙(denka black)이 사용되는 집전체용 언더코팅 잉크 제조 방법.A first mixing step of mixing the first solvent and the binder for 20 to 40 minutes (minute) at 25 to 40 rpm (revolution per minute) at atmospheric pressure using a mixer to form a first mixture;
a secondary mixing step of adding an additive to the first mixture and then mixing it for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer to form a secondary mixture;
a tertiary mixing step of forming a tertiary mixture by adding a second solvent to the secondary mixture and mixing for 20 to 40 minutes at 25 to 40 rpm at atmospheric pressure using a mixer;
a fourth mixing step of adding a conductive agent to the tertiary mixture and then mixing with a mixer at 25 to 40 rpm at atmospheric pressure for 20 to 40 minutes to form a quaternary mixture;
a fifth mixing step of mixing the fourth mixture in a vacuum at 2000 to 3000 rpm for 100 to 140 minutes using a mixer; and
When the fifth mixing is completed, a sixth mixing step of mixing the fourth mixture in a vacuum at 25 to 40 rpm for 20 to 40 minutes using a mixer,
In the first mixing step, the first solvent is isopropyl alcohol (IPA), the binder is chitosan or poly acrylic acid, and in the second mixing step, the additive is MEK (metyl ethyl) ketone) is used, pure water (H 2 O) is used as the second solvent in the third mixing step, and the conductive agent in the fourth mixing step is ketjen black, acetylene Black) or denka black (denka black) is used for a current collector undercoating ink manufacturing method.
상기 1차 혼합 단계 내지 상기 제4차 혼합 단계 중 상기 1차 혼합 단계에서 상기 1차 혼합물은 제1용매 65 내지 80wt％와 바인더 20 내지 35wt％를 혼합하여 형성되고, 상기 2차 혼합 단계에서 상기 2차 혼합물은 상기 1차 혼합물 90 내지 99wt％와 첨가제 1 내지 10wt％를 혼합하여 형성되며, 상기 3차 혼합 단계에서 상기 3차 혼합물은 상기 2차 혼합물 85 내지 96wt％와 제2용매 4 내지 15wt％를 혼합하여 형성되며, 상기 4차 혼합 단계에서 상기 4차 혼합물은 상기 3차 혼합물 85 내지 96wt％와 도전제 4 내지 15wt％를 혼합하여 형성되는 집전체용 언더코팅 잉크 제조 방법.According to claim 1,
In the first mixing step of the first mixing step to the fourth mixing step, the first mixture is formed by mixing 65 to 80 wt% of the first solvent and 20 to 35 wt% of the binder, and in the second mixing step, the The secondary mixture is formed by mixing 90 to 99 wt% of the first mixture and 1 to 10 wt% of the additive, and in the third mixing step, the tertiary mixture is 85 to 96 wt% of the second mixture and 4 to 15 wt% of the second solvent %, and in the fourth mixing step, the quaternary mixture is formed by mixing 85 to 96 wt% of the tertiary mixture and 4 to 15 wt% of the conductive agent.
상기 4차 혼합 단계에서 상기 4차 혼합물은 제1용매 60 내지 72wt％와 바인더 18 내지 23wt％와 첨가제 1 내지 3wt％와 제2용매 4 내지 7wt％와 도전제 5 내지 7wt％를 혼합하여 형성되는 집전체용 언더코팅 잉크 제조 방법.According to claim 1,
In the fourth mixing step, the fourth mixture is formed by mixing 60 to 72 wt% of the first solvent, 18 to 23 wt% of the binder, 1 to 3 wt% of the additive, 4 to 7 wt% of the second solvent, and 5 to 7 wt% of the conductive agent Method for manufacturing undercoating ink for current collector.
상기 5차 혼합 단계는 상기 4차 혼합물 99.1 내지 99.9wt％와 가교제 0.1 내지 0.9wt％를 혼합하여 5차 혼합물을 형성하며, 상기 가교제는 PPMA(propylene glycol methyl ether acetate)가 사용되는 집전체용 언더코팅 잉크 제조 방법.According to claim 1,
In the fifth mixing step, 99.1 to 99.9 wt% of the quaternary mixture and 0.1 to 0.9 wt% of a crosslinking agent are mixed to form a fifth mixture, and the crosslinking agent is PPMA (propylene glycol methyl ether acetate) under the current collector. Coating ink manufacturing method.
상기 5차 혼합 단계와 상기 6차 혼합 단계에서 각각 진공 상태는 0.1 내지 0.9 Torr인 집전체용 언더코팅 잉크 제조 방법.According to claim 1,
In each of the fifth mixing step and the sixth mixing step, the vacuum state is 0.1 to 0.9 Torr for a current collector undercoating ink manufacturing method.
상기 1차 혼합 단계 내지 상기 6차 혼합 단계에서 각각 사용되는 혼합기는 플래너터리 믹서(planetary mixer)가 사용되는 집전체용 언더코팅 잉크 제조 방법.According to claim 1,
The mixer used in each of the first mixing step to the sixth mixing step is a method for producing an undercoating ink for a current collector in which a planetary mixer is used.
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