WO2023059067A1 - 신규한 분산제를 포함하는 이차전지용 양극, 이를 포함하는 전극조립체, 및 이차전지 - Google Patents
신규한 분산제를 포함하는 이차전지용 양극, 이를 포함하는 전극조립체, 및 이차전지 Download PDFInfo
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- WO2023059067A1 WO2023059067A1 PCT/KR2022/015003 KR2022015003W WO2023059067A1 WO 2023059067 A1 WO2023059067 A1 WO 2023059067A1 KR 2022015003 W KR2022015003 W KR 2022015003W WO 2023059067 A1 WO2023059067 A1 WO 2023059067A1
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- Prior art keywords
- dispersant
- weight
- secondary battery
- positive electrode
- cathode
- Prior art date
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- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
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- 229910052748 manganese Inorganic materials 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
-
- 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
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a positive electrode for a secondary battery including a novel dispersant, an electrode assembly including the same, and a secondary battery.
- a secondary battery is a representative example of an electrochemical device using such electrochemical energy, and its use area is gradually expanding.
- a lithium secondary battery is manufactured by impregnating an electrode assembly composed of a positive electrode, a negative electrode, and a porous separator with a lithium non-aqueous electrolyte.
- lithium secondary batteries are generally cylindrical or prismatic secondary batteries, stacked or stacked/folded electrodes in which a stack/folding type or winding type electrode assembly is accommodated in a can made of metal as a battery case, depending on the shape of the battery case.
- a pouch-type battery having a structure in which the assembly is built into a pouch-type battery case of an aluminum laminate sheet.
- the loading of the active material layer is gradually increasing according to the demand for energy improvement of the cylindrical battery.
- An object of the present invention is to solve the problems of the prior art and the technical problems that have been requested from the past.
- the problem to be solved by the present invention is to prevent the deterioration of secondary battery performance, a secondary battery positive electrode with improved flexibility that can prevent cracks in the innermost positive electrode when manufacturing an electrode assembly having a wound structure, this It is to provide an electrode assembly and a secondary battery comprising the.
- a positive electrode for a secondary battery according to the present invention is formed on at least one surface of a current collector and includes a positive electrode mixture layer including a positive electrode active material, a conductive material, a binder, and a dispersant,
- the dispersing agent is a mixture of a butadiene-acrylonitrile-based first dispersing agent and a styrene-ethylene oxide-based (styrene-EO-based) second dispersing agent.
- the dispersant is characterized in that it is included in an amount of 0.1% by weight or more and less than 0.3% by weight based on the total weight of the positive electrode mixture layer.
- the dispersant may be included in an amount of 0.15 wt % to 0.25 wt % based on the total weight of the positive electrode mixture layer.
- the mixing ratio of the first dispersant and the second dispersant may be 8:2 to 2:8 based on weight.
- the first dispersant may include hydrogenated butadiene, non-hydrogenated butadiene, and acrylonitrile.
- the first dispersant may be a butadiene-acrylonitrile-based polymer in which 50 to 80% by weight of hydrogenated butadiene, 0.1 to 10% by weight of non-hydrogenated butadiene, and 15 to 40% by weight of acrylonitrile are polymerized, and the butadiene -
- the acrylonitrile-based polymer may have a weight average molecular weight of 30,000 to 80,000.
- the second dispersant may include styrene, ethylene oxide, and an aliphatic compound.
- the second dispersant may be a styrene-ethylene oxide-based polymer in which 20 to 40% by weight of styrene, 40 to 60% by weight of ethylene oxide, and 15 to 30% by weight of an aliphatic compound are polymerized, and the styrene-ethylene oxide
- the based polymer may have a weight average molecular weight of 9,000 to 12,000.
- the positive electrode active material of the positive electrode may be a lithium transition metal oxide represented by Formula 1 below.
- M is at least one selected from the group consisting of Cu, Ti, Mg, Al, Pt, and Zr;
- A is an oxygen-substituted halogen
- the conductive material may be carbon nanotubes.
- the positive electrode including the dispersant according to the present invention is preferably applied to a high-loading positive electrode, and specifically, the positive electrode mixture layer may have a loading amount of 26 mg/cm 2 to 30 mg/cm 2 .
- a cathode for a secondary battery having such a configuration may have a brittleness of 41 gf to 50 gf.
- the present invention also includes the positive electrode, the negative electrode, and the separator for the secondary battery, and the positive electrode, the negative electrode, and the separator are wound together so that the positive electrode is present on the innermost side. It provides an electrode assembly having a structure and having an innermost radius (r) of 1.4 mm to 2.0 mm.
- a secondary battery in which the electrode assembly and the electrolyte are embedded in a battery case.
- the positive electrode is formed on at least one surface of the current collector and includes a positive electrode mixture layer including a positive electrode active material, a conductive material, a binder, and a dispersant,
- the dispersing agent is a mixture of a butadiene-acrylonitrile-based first dispersing agent and a styrene-ethylene oxide-based (styrene-EO-based) second dispersing agent.
- the dispersant is provided in a cathode for a secondary battery including 0.1 wt% or more and less than 0.3 wt% based on the total weight of the cathode mixture layer.
- the inventors of the present application applied a novel dispersant capable of securing sufficient dispersibility when using a high-loading cathode after repeated in-depth research, and the content of the dispersant capable of exhibiting optimized secondary battery performance derived.
- the dispersing agent used in the positive electrode for a secondary battery according to the present invention is a mixture of a butadiene-acrylonitrile-based first dispersing agent and a styrene-ethylene oxide-based (styrene-EO-based) second dispersing agent, and the content of the total dispersant is the positive electrode mixture Based on the total weight of the layer, it may be included in an amount of 0.1% by weight or more and less than 0.3% by weight, specifically, 0.15% by weight to 0.25% by weight, and more specifically, 0.15% by weight to 0.2% by weight.
- the electrode flexibility improvement according to the present invention that is, the effect of preventing cracks cannot be obtained, and if it is too large, the dispersant acts as a resistance and the electrode resistance increases. High bar, not desirable.
- the mixing ratio of the first dispersant and the second dispersant may be 9:1 to 1:9, specifically 2:8 to 8:2, and more specifically 4:6, based on weight. to 6:4.
- the butadiene-acrylonitrile-based first dispersant serves to improve dispersibility of a cathode active material, etc.
- the styrene-ethylene oxide-based (styrene-EO) second dispersant serves to impart flexibility to the electrode.
- the first dispersant may specifically include hydrogenated butadiene, non-hydrogenated butadiene, and acrylonitrile, and more specifically, 50 to 80% by weight of hydrogenated butadiene, 0.1 to 10% by weight of non-hydrogenated butadiene, and acrylonitrile. 15 to 40% by weight may be a polymerized butadiene-acrylonitrile-based polymer.
- the first dispersant may be a butadiene-acrylonitrile-based polymer in which 60 to 70% by weight of hydrogenated butadiene, 0.1 to 1% by weight of non-hydrogenated butadiene, and 29 to 39% by weight of acrylonitrile are polymerized.
- the butadiene-acrylonitrile-based polymer may have a weight average molecular weight of 30,000 to 80,000, specifically 40,000 to 60,000.
- the second dispersant may specifically include styrene, ethylene oxide, and an aliphatic compound, and more specifically, 20 to 40% by weight of styrene, 40 to 60% by weight of ethylene oxide, and 15 to 30% by weight of an aliphatic compound
- the weight percent may be a polymerized styrene-ethylene oxide-based polymer.
- the second dispersant may be a styrene-ethylene oxide-based polymer in which 20 to 30% by weight of styrene, 50 to 60% by weight of ethylene oxide, and 20 to 30% by weight of an aliphatic compound are polymerized.
- the styrene-ethylene oxide-based polymer may have a weight average molecular weight of 9,000 to 12,000, specifically 10,000 to 11,000.
- the weight average molecular weight, Mw can be measured using gel permeation chromatography (GPC). Specifically, evaluation was performed using a Waters PL-GPC220 instrument using a Polymer Laboratories PLgel MIX-B 300 mm long column. The evaluation temperature was 160 °C, 1,2,4-trichlorobenzene was used as a solvent, and the flow rate was measured at a rate of 1 mL/min. The sample was prepared at a concentration of 10mg/10mL and then supplied in an amount of 200 ⁇ L. The value of Mw was derived using a calibration curve formed using polystyrene standards. Nine kinds of molecular weight of polystyrene standards were used: 2,000 / 10,000 / 30,000 / 70,000 / 200,000 / 700,000 / 2,000,000 / 4,000,000 / 10,000,000.
- the cathode active material may be a lithium transition metal oxide having a high Ni content represented by Formula 1 below.
- M is at least one selected from the group consisting of Cu, Ti, Mg, Al, Pt, and Zr;
- A is an oxygen-substituted halogen
- the a may be 0.88 ⁇ a ⁇ 1.
- lithium transition metal oxide represented by Chemical Formula 1 and other active materials may be mixed and used.
- the conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite or artificial graphite; carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; conductive fibers such as carbon fibers and metal fibers; metal powders such as carbon fluoride, aluminum, and nickel powder; conductive whiskeys such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives may be used.
- carbon fibers may be carbon nanotubes.
- the carbon nanotubes may be single-walled carbon nanotubes or multi-walled carbon nanotubes.
- the conductive material may be included in an amount of 0.1 to 30% by weight, specifically 0.1 to 10% by weight, and more specifically 0.5 to 5% by weight based on the total weight of the positive electrode mixture layer.
- binder examples include polyvinylidene fluoride (PVDF), vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, polyacrylonitrile, and carboxymethylcellulose.
- Woods (CMC) starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene polymer (EPDM), sulfonated-EPDM , styrene butadiene rubber (SBR), fluororubber, or various copolymers thereof.
- the binder may be included in an amount of 0.1 to 30% by weight, specifically 0.1 to 10% by weight, and more specifically 0.5 to 5% by weight based on the total weight of the positive electrode mixture layer.
- the present invention is more effective in a high loading cathode, and thus, the cathode mixture layer may have a loading amount of 26 mg/cm 2 to 30 mg/cm 2 .
- dispersant according to the present invention may be most effective in a high-loading anode within the above range.
- the positive electrode for a secondary battery having such a configuration may have increased flexibility and thus have a brittleness of 41 gf to 50 gf.
- the breaking strength is measured by placing the anode on a support so that both ends of the manufactured anode having a width of 3 cm or less are positioned on the support so that the middle part is away from the ground, and then the center of the anode is placed on a plate of 3 cm x 10 cm x 10 mm from the top.
- the thinnest part is the value measured for the strength at which the anode is broken by pressing the center of the anode at a speed of 1 mm/sec, which is a value that is not affected by the area of the anode.
- the present invention has a structure in which the positive electrode, the negative electrode, and the separator are wound together so that the positive electrode, the negative electrode, and the separator are included, and the positive electrode is present at the innermost side.
- An electrode assembly having an inner radius (r) of 1.4 mm to 2.0 mm is provided.
- the flexibility of the electrode is increased, and even if the innermost radius (r) is formed as small as the above range, cracks do not occur in the core part, and the energy density per volume is higher. It is possible to manufacture an electrode assembly.
- a secondary battery in which the electrode assembly and the electrolyte are built into a battery case together.
- LiNi 0.88 Co 0.07 Mn 0.04 Al 0.01 O 2 as a cathode active material, an active material mixture in which Li 2 NiO 2 was mixed in a weight ratio of 95:5 as a sacrificial cathode material, carbon nanotubes as a conductive material, and a weight average molecular weight of 50,000 as a dispersant.
- Butadiene-acrylonitrile-based dispersant A mixture of a styrene-ethylene oxide-based dispersant having a weight average molecular weight of 10,000 at a weight ratio of 40:60, and PVDF as a binder in an N-methylpyrrolidone solvent at a weight ratio of 98.02:
- a cathode-forming composition was prepared by mixing at a ratio of 0.6:0.1:1.28, and the composition was applied to an aluminum current collector in a loading amount of 28.9 mg/cm 2 to prepare a cathode A.
- positive electrode B was prepared in the same manner as in Example 1, except that the positive electrode active material: conductive material: dispersant: binder were mixed in a weight ratio of 97.94: 0.6: 0.18: 1.28 in N-methylpyrrolidone solvent. manufactured.
- Example 1 a butadiene-acrylonitrile-based dispersant having a weight average molecular weight of 20,000 was prepared by mixing the cathode active material: conductive material: dispersant: binder at a weight ratio of 97.94: 0.6: 0.18: 1.28 in an N-methylpyrrolidone solvent.
- Anode C was prepared in the same manner as in Example 1 except for the use of the cathode.
- Example 1 a butadiene-acrylonitrile-based dispersant having a weight average molecular weight of 90,000 was prepared by mixing the cathode active material: conductive material: dispersant: binder in a weight ratio of 97.94: 0.6: 0.18: 1.28 in an N-methylpyrrolidone solvent.
- Anode D was prepared in the same manner as in Example 1 except for the use of the cathode.
- Example 1 the cathode active material: conductive material: dispersant: binder were mixed at a weight ratio of 97.94: 0.6: 0.18: 1.28 in an N-methylpyrrolidone solvent, and a styrene-ethylene oxide-based dispersant having a weight average molecular weight of 5,000 was used.
- Anode E was prepared in the same manner as in Example 1 except for the above.
- Example 1 a butadiene-acrylonitrile-based dispersant having a weight average molecular weight of 15,000 was prepared by mixing the cathode active material: conductive material: dispersant: binder at a weight ratio of 97.94: 0.6: 0.18: 1.28 in an N-methylpyrrolidone solvent.
- a positive electrode F was prepared in the same manner as in Example 1 except for the use.
- positive electrode G was prepared in the same manner as in Example 1, except that the positive electrode active material: conductive material: dispersant: binder were mixed in a weight ratio of 97.82: 0.6: 0.3: 1.28 in N-methylpyrrolidone solvent. manufactured.
- LiNi 0.88 Co 0.07 Mn 0.04 Al 0.1 O 2 as a cathode active material
- an active material mixture in which Li 2 NiO 2 was mixed in a weight ratio of 95:5 as a sacrificial cathode material, carbon nanotubes as a conductive material, and a weight average molecular weight of 220,000 as a dispersant.
- a butadiene-acrylonitrile-based dispersant and PVDF as a binder were mixed in an N-methylpyrrolidone solvent in a weight ratio of 98:0.6:0.12:1.28 to prepare a composition for forming an anode, which was loaded on an aluminum current collector.
- a positive electrode H was prepared by applying it to a concentration of 28.9 mg/cm 2 .
- Example 1 Same as Example 1 except that the content of the dispersant in Example 1 was reduced, and the cathode active material: conductive material: dispersant: binder was mixed at a weight ratio of 98.03: 0.6: 0.07: 1.28 in N-methylpyrrolidone solvent. Thus, positive electrode I was prepared.
- the positive electrodes prepared in Examples 1 to 6 and Comparative Examples 1 to 3 were wound using a 3.2pi winding core. After 1 hour, the positive electrode was released to visually check for cracks, and the results are shown in Table 2 below.
- Comparative Example 2 having too high a breaking strength can confirm that cracks have occurred.
- a mixture of graphite:SiO in a ratio of 95:5 by weight was used as an anode active material, styrene-butadiene rubber (SBR) as a binder, sodium carboxymethylcellulose (CMC) as a thickener, and carbon black as a conductive material of 97:
- SBR styrene-butadiene rubber
- CMC sodium carboxymethylcellulose
- carbon black carbon black
- a polyethylene separator (thickness: 15 um) was interposed, and ethylene carbonate (EC), ethyl methyl carbonate (EMC), and dimethyl carbonate (DMC) were mixed at a ratio of 20:10
- EC ethylene carbonate
- EMC ethyl methyl carbonate
- DMC dimethyl carbonate
- a secondary battery was prepared by injecting an electrolyte solution including solvents mixed at a volume ratio of 70 and 1M of 1.3M LiPF 6 in the total amount of the electrolyte.
- the case of using the positive electrode according to the present invention shows a similar level of resistance value compared to the case of using the existing dispersant.
- the resistance increases rapidly, and even when a small amount of the dispersant is used, it can be confirmed that the resistance increases.
- the weight average molecular weight of the dispersant is too small or to 6
- the resistance tends to increase slightly compared to Example 2 due to the decrease in stability of the slurry and the action of the dispersant as a resistor.
- the positive electrode for a secondary battery according to an embodiment of the present invention includes a novel dispersant, so that cracks in the core portion can be prevented during manufacture of an electrode assembly having a wound structure, even if it is manufactured by high loading. There is an effect of preventing performance deterioration of the secondary battery including the.
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Abstract
Description
1회(gf) | 2회(gf) | 3회(gf) | |
실시예 1 | 48.3 | 49.8 | 49.3 |
실시예 2 | 45.1 | 44.1 | 42.4 |
실시예 3 | 43.5 | 42.7 | 43.9 |
실시예 4 | 46.7 | 45.4 | 46.6 |
실시예 5 | 43.1 | 44.5 | 42.1 |
실시예 6 | 47.4 | 46.4 | 45.9 |
비교예 1 | 40.3 | 40.0 | 41.6 |
비교예 2 | 56.7 | 51.4 | 53.9 |
비교예 3 | 49.4 | 51.7 | 50.6 |
크랙 여부 | |
실시예 1 | X |
실시예 2 | X |
실시예 3 | X |
실시예 4 | X |
실시예 5 | X |
실시예 6 | X |
비교예 1 | X |
비교예 2 | O |
비교예 3 | X |
DCIR(mOhm) | |
실시예 1 | 23.2 |
실시예 2 | 23.5 |
실시예 3 | 24.1 |
실시예 4 | 25.2 |
실시예 5 | 24.4 |
실시예 6 | 24.9 |
비교예 1 | 28.9 |
비교예 2 | 22.7 |
비교예 3 | 25.3 |
Claims (15)
- 이차전지용 양극으로서,상기 양극은 집전체의 적어도 일면에 형성되고, 양극 활물질, 도전재, 바인더, 및 분산제를 포함하는 양극 합제층을 포함하고,상기 분산제는 부타디엔-아크릴로니트릴계 제1 분산제 및 스티렌-에틸렌 옥사이드계(styrene-EO계) 제2 분산제의 혼합물이며.상기 분산제는 양극 합제층 전체 중량을 기준으로 0.1중량% 이상 내지 0.3중량% 미만으로 포함되는 이차전지용 양극.
- 제1항에 있어서,상기 분산제는 양극 합제층 전체 중량을 기준으로 0.15중량% 내지 0.25중량%로 포함되는 이차전지용 양극.
- 제1항에 있어서,상기 분산제는 상기 제1 분산제 및 상기 제2 분산제의 혼합비가 중량을 기준으로 8:2 내지 2:8인 이차전지용 양극.
- 제1항에 있어서,상기 제1 분산제는 수소화 부타디엔, 비수소화 부타디엔, 및 아크릴로니트릴을 포함하는 이차전지용 양극.
- 제4항에 있어서,상기 제1 분산제는 수소화 부타디엔 50 내지 80중량%, 비수소화 부타디엔 0.1 내지 10중량%, 아크릴로니트릴 15 내지 40중량%가 중합된 부타디엔-아크릴로니트릴계 중합체인 이차전지용 양극.
- 제5항에 있어서,상기 부타디엔-아크릴로니트릴계 중합체는 중량 평균 분자량이 30,000 내지 80,000인 이차전지용 양극.
- 제1항에 있어서,상기 제2 분산제는 스티렌, 에틸렌 옥사이드, 및 지방족 화합물을 포함하는 이차전지용 양극.
- 제7항에 있어서,상기 제2 분산제는 스티렌 20 내지 40중량%, 에틸렌 옥사이드 40 내지 60중량%, 및 지방족 화합물 15 내지 30중량%가 중합된 스티렌-에틸렌 옥사이드계 중합체인 이차전지용 양극.
- 제8항에 있어서,상기 스티렌-에틸렌 옥사이드계 중합체는 중량 평균 분자량이 9,000 내지 12,000인 이차전지용 양극.
- 제1항에 있어서,상기 양극 활물질은, 하기 화학식 1로 표시되는 리튬 전이금속 산화물인 이차전지:Li1+xNiaCobMncM1-(a+b+c)O2-yAy (1)상기 식에서,M은 Cu, Ti, Mg, Al, Pt, 및 Zr로 이루어진 군에서 선택되는 적어도 1종이고,A는 산소 치환형 할로겐이며,0≤x≤0.5, 0.8≤a≤1, 0≤b≤0.2, 0≤c≤0.2, 0.9≤a+b+c≤1, 및 0≤y≤0.001이다.
- 제1항에 있어서,상기 도전재는 카본 나노 튜브인 이차전지용 양극.
- 제1항에 있어서,상기 양극 합제층은 26mg/cm2 내지 30mg/cm2의 로딩량을 가지는 이차전지용 양극.
- 제1항에 있어서,상기 이차전지용 양극은 파단 강도(brittleness)가 41gf 내지 50gf인 이차전지용 양극.
- 제1항에 따른 이차전지용 양극, 음극, 및 분리막을 포함하고,상기 양극이 최내측에 존재하도록 상기 양극, 음극, 및 분리막이 함께 권취된 구조를 가지며,최내측 반지름(r)이 1.4mm 내지 2.0mm인 전극조립체.
- 제14항에 따른 전극조립체, 및 전해액이 함께 전지케이스에 내장되어 있는 이차전지.
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