Aqueous slurry composition and secondary battery comprising coating layer formed using same

Abstract

An aqueous slurry composition according to one aspect of the present invention may comprise an aqueous solvent, styrene-butadiene rubber (SBR) and an acrylamide-based polymer.

Description

A secondary battery comprising an aqueous slurry composition and a coating layer formed therefrom

[0001] The present invention relates to a secondary battery comprising an aqueous slurry composition and a coating layer formed therefrom, and in a more detailed embodiment, to a secondary battery comprising an insulating slurry composition using water as a solvent instead of an organic solvent that causes environmental pollution, and an insulating coating layer formed therefrom.

[0002] As the application fields of rechargeable batteries expand to include not only mobile phones, digital cameras, laptop computers, and power tools, but also electric bicycles, electric vehicles, and energy storage devices, there is a growing demand for higher energy density and greater safety for batteries used as power sources for electronic energy devices.

[0003] As an example, a lithium-ion secondary battery is composed of a negative electrode made of a carbon material capable of inserting and extracting lithium ions, a positive electrode made of a lithium-containing oxide, a porous separator between the two electrodes, and a non-aqueous electrolyte in which lithium is dissolved in a mixed organic solvent.

[0004] Regarding the stability of such secondary batteries, under normal conditions, the separator between the positive and negative electrodes maintains electrical insulation, but there is a problem where an internal short circuit occurs due to dendrites grown in the electrode material, external impact, or foreign substances.

[0005] To resolve this problem, a method of forming an insulating coating layer on the electrode active material layer, etc., was applied.

[0006] A non-aqueous slurry composition, in which a binder or the like is mixed with an organic solvent, is used as a slurry composition to form the insulating coating layer of the same, but such a composition has problems such as causing environmental pollution.

[0007] One objective of the present invention is to provide an environmentally friendly water-based slurry composition comprising two types of binders in a water-based solvent, which can significantly improve insulation, adhesion, resistance to electrolytes at high temperatures, and heat resistance, and satisfy all viscosity conditions in a coating process.

[0008] In addition, the present invention aims to provide a water-based slurry composition in which the mixing weight ratio of two selected binders, the selection of other compositions, the mixing weight ratio of a ceramic compound and two selected binders, and the mixing weight ratio between other compositions are controlled.

[0009] A water-based slurry composition according to one embodiment of the present invention may include a water-based solvent, styrene-butadiene rubber (SBR), and an acrylamide-based polymer.

[0010] In a more preferred embodiment, the weight percentage of styrene-butadiene rubber (SBR) based on the weight percentage of an acrylamide-based polymer may be 5% to 40% by weight.

[0011] In a more preferred embodiment, the aqueous slurry composition comprises a ceramic compound, and the total weight percentage of styrene-butadiene rubber (SBR) and acrylamide-based polymer based on the weight percentage of the ceramic compound may be 1 weight% to 20 weight%.

[0012] In a more preferred embodiment, the aqueous slurry composition comprises a ceramic compound, and the weight percentage of the ceramic compound may be 15% to 30% by weight based on the total weight percentage of the aqueous slurry composition.

[0013] In a more preferred embodiment, the aqueous slurry composition comprises a silicon-containing surfactant, and the weight percentage of the silicon-containing surfactant may be 0.01% to 0.5% based on the total weight percentage of the aqueous slurry composition.

[0014] In a more preferred embodiment, the aqueous slurry composition may further include at least one selected from polyvinyl alcohol, polypropylene alcohol, polypropylene glycol, and polyethylene glycol.

[0015] In a more preferred embodiment, the aqueous slurry composition may further include a dispersant comprising an ammonium acrylate copolymer.

[0016] In a more preferred embodiment, the aqueous slurry composition may further include a dispersant comprising boehmite, a silicone-containing surfactant, polyvinyl alcohol, and an ammonium acrylate copolymer.

[0017] In a more preferred embodiment, the viscosity of the aqueous slurry composition may be 10 cp (23±1℃) to 100 cp (23±1℃).

[0018] A secondary battery according to one embodiment of the present invention may include a coating layer formed from the above-mentioned aqueous slurry composition.

[0019] In a more preferred embodiment, the coating layer may be included in part or all of the anode.

[0020] One effect of the present invention is to provide a more environmentally friendly water-based slurry composition.

[0021] In addition, the present invention provides an aqueous slurry composition that ensures electrolyte resistance and heat resistance at high temperatures and is less affected by battery manufacturing processes, such as laser notching, during the battery manufacturing process.

[0022] In addition, the present invention provides a water-based slurry composition that can improve the adhesion between ceramic compounds while simultaneously significantly increasing the adhesion between the ceramic compound and the electrode current collector.

[0023] In addition, the present invention provides a water-based slurry composition that is controlled to a suitable viscosity applicable in a high-speed coating process and can ensure high insulation properties even with a small amount of coating.

[0024] In addition, the present invention provides a water-based slurry composition capable of satisfying all conditions of high adhesion, insulation, electrolyte resistance, and viscosity.

[0025] Expressions such as "comprising" as used in this specification should be understood as open-ended terms implying the possibility of including other configurations.

[0026] As used herein, "preferably" and "preferably" refer to embodiments of the invention that can provide certain advantages under certain conditions. However, it is not intended to exclude other embodiments from the scope of the invention.

[0027] The numerical ranges used in this specification include lower and upper limits and all values ​​within the range, increments logically derived from the form and width of the defined range, all of which are limited values, and all possible combinations of upper and lower limits of numerical ranges limited in different forms.

[0028] Unless otherwise specifically defined in this specification, values ​​outside the numerical range that may occur due to experimental error or rounding are also included in the defined numerical range.

[0029] The meaning of 'greater than' or 'less than' as described in this specification may be replaced with the meaning of 'greater than' or 'less than'.

[0030]

[0031] Meanwhile, the technical features described below relate to one embodiment that achieves the intended effect of the present invention described above.

[0032] The present invention relates to an aqueous slurry composition.

[0033] In one embodiment, the aqueous slurry composition may be an aqueous insulating slurry composition used for electrical insulation.

[0034] In one embodiment, the aqueous slurry composition may be an aqueous insulating slurry composition for a secondary battery for forming an electrical insulating coating layer in a secondary battery.

[0035] A water-based slurry composition according to one embodiment of the present invention may include a water-based solvent.

[0036] The present invention can be more environmentally friendly by mixing a binder, etc., with an aqueous solvent instead of an organic solvent.

[0037] For example, the above aqueous solvent may mean water.

[0038] More preferably, the aqueous solvent may be 65% by weight or more, 70% by weight or more, 85% by weight or less, or 80% by weight based on the total weight of the aqueous slurry composition. Within the above numerical range, the viscosity is controlled to be suitable for a high-speed coating process while mixed with other compositions of the present invention, and the adhesion strength can be further improved.

[0039] In one embodiment, the water-based slurry composition may include styrene-butadiene rubber (SBR) and an acrylamide-based polymer as binders.

[0040] The inventors selected a binder that ensures electrolyte resistance and heat resistance at high temperatures when mixed with an aqueous solvent, and is less affected by processes such as laser notching during the battery manufacturing process.

[0041] Meanwhile, if only one of the two types of binders mentioned above is included, the adhesion between the ceramic compounds may be good, but the adhesion between the ceramic compounds and the electrode current collector, such as metal, may not be good, or the opposite may be true.

[0042] Accordingly, the inventors selected a combination of the two types of binders that can improve the adhesion between ceramic compounds while simultaneously significantly increasing the adhesion between the ceramic compounds and electrode current collectors such as metals.

[0043] In addition, when only acrylamide-based polymers are used, electrolyte resistance is ensured, but there are problems with poor adhesion and difficulty in peeling. When styrene butadiene rubber (SBR) is included in a controlled mixing weight ratio, these problems with adhesion and peeling can be resolved.

[0044] As an example, the styrene-butadiene rubber (SBR) mentioned above may be a copolymer made by emulsion polymerization of butadiene and styrene.

[0045] As an example, the acrylamide-based polymer may be formed by polymerizing acrylamide, methacrylamide, N-methylmethacrylamide, hydroxyethyl acrylamide, hydroxyethyl methacrylamide, dimethylacrylamide, or a combination thereof.

[0046] More preferably, based on the total weight% of the aqueous slurry composition, the weight% of styrene-butadiene rubber (SBR) and acrylamide-based materials may be 1.5 weight% or more, 1.8 weight% or more, 2.1 weight% or more, 3.5 weight% or less, 3.0 weight% or less, or 2.5 weight%.

[0047] In a more preferred embodiment, based on the weight percentage of the acrylamide-based polymer, the weight percentage of styrene-butadiene rubber (SBR) may be 5 weight% or more, 10 weight% or more, 15 weight% or more, 18 weight% or more, 20 weight% or more, 40 weight% or less, 35 weight% or less, 30 weight% or less, 25 weight% or less, or 20 weight% or less, and more preferably 15 weight% to 35 weight% or less, more preferably 20 weight% to 30 weight%.

[0048] The inventors have confirmed that within the above numerical range, the viscosity of the two types of binders can be controlled for high-speed coating while being mixed with an aqueous solvent, and that the adhesion between ceramic compounds can be improved, while at the same time the adhesion between the ceramic compounds and the metal can be significantly increased and the electrolyte resistance can be increased.

[0049] In one embodiment, the aqueous slurry composition may further include a ceramic compound.

[0050] For example, the ceramic compound may be Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, or a combination thereof, but more preferably may be alumina hydrate, and more preferably may be boehmite.

[0051] More preferably, the average particle size (D50) of the ceramic compound may be 0.05 μm or more, 0.10 μm or more, 1.0 μm or less, 0.5 μm or less, 0.4 μm or less, 0.3 μm or less, 0.2 μm or less, or 0.15 μm or less. When the size of the ceramic particles is controlled within the above numerical range, high insulation can be secured while forming a thin coating layer with a minimized coating amount.

[0052] Meanwhile, in the present invention, the average particle size (D50) refers to the diameter of a particle whose cumulative volume in the particle size distribution is 50% by volume. The average particle size (D50) can be measured by methods widely known to those skilled in the art, for example, by measuring with a particle size analyzer, or by measuring with a transmission electron microscope (TEM) image or a scanning electron microscope (SEM) image. Alternatively, the average particle size (D50) value can be obtained by measuring using a measuring device utilizing dynamic light-scattering, performing data analysis to count the number of particles for each particle size range, and then calculating from this.

[0053] The inventors have confirmed that when boehmite is included in the aqueous slurry composition of the present invention and when boehmite is included within the above numerical range, high insulation can be secured while forming a thin coating layer.

[0054] In a more preferred embodiment, the aqueous slurry composition further comprises a ceramic compound, and the weight percentage of the ceramic compound based on the total weight percentage of the aqueous slurry composition may be 15 weight% or more, 20 weight% or more, 30 weight% or less, or 25 weight% or less.

[0055] In a more preferred embodiment, the total weight percentage of styrene-butadiene rubber (SBR) and acrylamide-based polymer based on the weight percentage of the ceramic compound may be 1 weight% or more, 5 weight% or more, 6 weight% or more, 7 weight% or more, 8 weight% or more, 9 weight% or more, 20 weight% or less, 15 weight% or less, 14 weight% or less, 13 weight% or less, 12 weight% or less, 11 weight% or less, or 10 weight% or less.

[0056] The inventors have confirmed that the ratio of ceramic to binder is very important when considering high adhesion, insulation, electrolyte resistance, viscosity, etc., and that the performance is significantly improved within the above numerical range.

[0057] In one embodiment, the aqueous slurry composition may include a silicone-containing surfactant.

[0058] In the case of water-based slurries, the surface tension of the water is high and the temperature is very low, which can reduce coating performance. Accordingly, the inventors confirmed that when a silicone-containing surfactant is included in the water-based slurry, the surface tension is lowered.

[0059] As a more preferred embodiment for the above-mentioned improved effect, the silicone-containing surfactant may be a polyether-modified siloxane.

[0060] More preferably, based on the total weight percent of the aqueous slurry composition, the weight percent of the silicone-containing surfactant may be 0.01 weight percent or more, 0.1 weight percent or more, 0.15 weight percent or more, 0.5 weight percent or less, 0.4 weight percent or less, or 0.3 weight percent or less. Within the above numerical ranges, the dispersibility and wettability of the aqueous slurry composition of the present invention can be further improved.

[0061] In one embodiment, the aqueous slurry composition may further include at least one selected from polyvinyl alcohol, polypropylene alcohol, polypropylene glycol, and polyethylene glycol. The polyvinyl alcohol, etc., is reactive in lithium-ion batteries and can act as a wetting agent when added in small amounts.

[0062] More preferably, the aqueous slurry composition may include polyvinyl alcohol as a wetting agent. The present invention can further improve the overall wettability of the coating layer of the present invention by including polyvinyl alcohol as a wetting agent, more preferably.

[0063] In particular, the aqueous slurry composition of the present invention can be applied and dried on an electrode current collector and / or an electrode active material layer to form a coating layer, and in particular, the positive active material component may be very vulnerable to moisture. In particular, when water is used as a solvent, it may cause damage to the active material layer, and furthermore, there is a problem of gelation occurring upon contact with a non-aqueous binder included in the active material slurry. If polyvinyl alcohol is included in the aqueous slurry composition of the present invention, these problems can be resolved.

[0064] Meanwhile, to further improve the above problem, it is preferable that at least one selected from the polyvinyl alcohol, polypropylene alcohol, polypropylene glycol, and polyethylene glycol be included in an amount of 0.01% or more, 0.05% or more, 0.1% or more, 0.5% or less, 0.3% or less, or 0.2% or less based on the total weight% of the water-based slurry composition.

[0065] In one embodiment, the aqueous slurry composition of the present invention may further include a dispersant.

[0066] The dispersant of the present invention may be a composition capable of uniformly dispersing fine particles within a solvent.

[0067] In one embodiment, the dispersant of the present invention may be a polymeric dispersant such as a polycarboxylic acid, a polyacrylic acid, a polymethacrylic acid, a polycarboxylate, a polyacrylate, or a polymethacrylate, and more preferably, may be a mixture of water and an ammonium acrylate copolymer.

[0068] For example, the ammonium acrylate copolymer may be an ammonium salt of an acrylate copolymer, and may be an ammonium salt of a polymer composed of two or more monomers composed of acrylic acid, methacrylic acid, or simple esters thereof.

[0069] In one embodiment, the dispersant may contain 40% to 60% by weight of an ammonium acrylate copolymer based on the total weight percentage of the dispersant.

[0070] In one embodiment, the pH of the dispersant may be 4 to 8, or 6 to 8.

[0071] More preferably, based on the total weight percentage of the aqueous slurry composition, the weight percentage of the dispersant may be 0.05 weight% or more, 0.1 weight% or more, 0.2 weight% or more, 0.5 weight% or less, 0.4 weight% or less, 0.3 weight% or less, or 0.2 weight% or less.

[0072] As the above-mentioned dispersant is included within the numerical range of the above content, the two types of binders and compositions included in the aqueous slurry composition of the present invention can be mixed with the aqueous solvent at the aforementioned content to maintain an appropriate degree of dispersion and make it more advantageous for a high-speed coating process.

[0073] In a more preferred embodiment, the aqueous slurry composition may include an aqueous solvent, styrene-butadiene rubber (SBR), an acrylamide-based polymer, boehmite, a silicone-containing surfactant, polyvinyl alcohol, and a dispersant comprising an ammonium acrylate copolymer. In this case, all conditions for high adhesion, insulation, electrolyte resistance, and viscosity can be satisfied, and when an insulating coating layer is formed in a secondary battery, the stability of the secondary battery can be further increased, damage to the active material layer can be reduced, and gelation phenomena can be further reduced.

[0074] For the above improved effect, it is more preferable that the total weight percentage of the dispersant comprising styrene-butadiene rubber (SBR), an acrylamide-based polymer, boehmite, a silicone-containing surfactant, polyvinyl alcohol, and an ammonium acrylate copolymer be 15 weight% or more, 20 weight% or more, 35 weight% or less, or 30 weight% or less, based on the total weight percentage of the aqueous slurry composition.

[0075] For the above improved effect, based on the total weight% of the aqueous slurry composition, the composition may comprise 65% to 85% by weight of an aqueous solvent, 1.5% to 3.5% by weight or less of styrene-butadiene rubber (SBR) and acrylamide-based polymer, 15% to 30% by weight of boehmite, 0.01% to 0.5% by weight of a silicone-containing surfactant, 0.01% to 0.5% by weight of polyvinyl alcohol, and 0.05% to 0.5% by weight of a dispersant comprising an ammonium acrylate copolymer.

[0076] The viscosity of the aqueous slurry composition according to one embodiment of the present invention can be controlled to be 10 cp (23±1℃) or higher, 13 cp (23±1℃) or higher, 15 cp (23±1℃) or higher, 20 cp (23±1℃) or higher, 100 cp (23±1℃) or lower, 80 cp (23±1℃) or lower, 50 cp (23±1℃) or lower, 40 cp (23±1℃) or lower, or 30 cp (23±1℃) or lower. When the viscosity is controlled within the above numerical range, it is more suitable for high-speed coating, and as an example, may be suitable for a gravure coating process.

[0077] In the present invention, 'viscosity' can be measured using an LV-61 Spindle from a Brookfield viscometer (DV Plus / Ametek Brookfield). The viscosity can be measured by adjusting the rpm so that the torque value is approximately 70% based on a slurry temperature of 23±1℃ and checking the viscosity value. At this time, the rpm can be 150 to 200.

[0078] A secondary battery according to one embodiment of the present invention may include a coating layer formed from the above-mentioned aqueous slurry composition.

[0079] In a more specific embodiment, the coating layer may be a coating layer formed by applying and drying the water-based slurry composition on the surface of a coating target. For example, the water-based slurry composition may be dried using a hot air method.

[0080] In a more specific embodiment, the coating layer may be an insulating coating layer included in a secondary battery.

[0081] In this case, if the coating layer can be used for insulation within a secondary battery, there are no restrictions on the location and / or form of use.

[0082] For example, it may be a coating layer disposed on part or all of one side and / or both sides of a porous separator surface, and may be a coating layer disposed on part or all of an electrode of a secondary battery.

[0083] Meanwhile, the meaning of being included in part or all of the above electrode may mean being included in part or all of one side and / or both sides of the electrode active material layer, or being included in part or all of one side and / or both sides of the electrode current collector.

[0084] In a more preferred embodiment, the coating layer may be included in part or all of the anode.

[0085] The aqueous slurry composition of the present invention is more suitable for protecting the anode active material component, and can further reduce the problem of gelation caused by non-aqueous binders.

[0086] In addition, when the aqueous slurry composition of the present invention is coated onto aluminum, which is an anode current collector, the adhesion to the aluminum plate can be significantly improved.

[0087] As a non-limiting example, the thickness of the coating layer may be 1 μm to 30 μm.

[0088] In particular, high insulation can be ensured even when the coating layer formed from the aqueous slurry composition of the present invention has a thin thickness within the range of 1 μm to 10 μm.

[0089] Meanwhile, the secondary battery of the present invention is not limited in type as long as it is a battery that converts external electrical energy into the form of chemical energy for storage and reuse. Non-limiting examples of the secondary battery may include lithium-ion secondary batteries, lithium-metal secondary batteries, lithium-polymer secondary batteries, lithium-ion polymer secondary batteries, or lithium-sulfur secondary batteries.

[0090] In one embodiment, the positive electrode of the secondary battery may include a current collector and a positive electrode active material layer formed on the current collector, and the positive electrode active material layer may further include a binder or a conductive material in addition to the positive electrode active material. There are no particular limitations thereon as long as the positive electrode active material is a compound capable of ion intercalation and deintercalation. As an example, the positive electrode active material may be at least one selected from the group consisting of a lithium iron phosphate compound, a lithium-containing transition metal oxide, namely, a lithium cobalt-based oxide, a lithium manganese-based oxide, a lithium copper oxide, a lithium nickel-based oxide, a lithium manganese composite oxide, and a lithium-nickel-manganese-cobalt-based oxide.

[0091] In one embodiment, the negative electrode of a secondary battery may include a current collector and a negative electrode active material layer formed on the current collector, and the negative electrode active material layer may further include a binder or a conductive material in addition to the negative electrode active material. The negative electrode active material is a material capable of reversibly intercalating and deintercalating ions, and carbon-based or silicon-containing negative electrode active materials may be used, but are not limited thereto.

[0092] In one embodiment, the separator of a secondary battery separates the negative electrode and the positive electrode and provides a pathway for the movement of lithium ions; any separator typically used in secondary batteries can be used without any special restrictions.

[0093] In one embodiment, the electrolyte of the secondary battery may be an organic liquid electrolyte, an inorganic liquid electrolyte, a solid polymer electrolyte, a gel-type polymer electrolyte, a solid inorganic electrolyte, a molten inorganic electrolyte, etc., but is not limited thereto.

[0094] Meanwhile, the structure of the secondary battery, the materials of each component, and the method of manufacturing the secondary battery, etc., are interpreted to include all possible without limitation.

[0095]

[0096] Hereinafter, embodiments of the present invention will be described in more detail.

[0097]

[0098] <Preparation Examples 1 to 23>

[0099] Preparation of water-based slurry composition

[0100] First, water-based slurry compositions of Preparation Examples 1 to 23 were prepared by mixing according to the compositions listed in Table 1 below.

[0101]

[0102] Formation of an insulating coating layer

[0103] Samples were prepared by coating the aqueous slurry compositions of Preparation Examples 1 to 23 above onto aluminum metal foil and drying them to form an insulating coating layer with an average thickness of about 4 μm. When coating the aluminum foil, a general doctor blade coating machine was used, and the thickness was adjusted by controlling the doctor blade gap.

[0104]

[0105] <Experimental Example>

[0106] Adhesion strength measurement

[0107] Samples with insulating coating layers formed according to Manufacturing Examples 1 to 23 above were cut into pieces 7 cm x 2.5 cm wide, and then the adhesion strength was measured through a 90-degree peel test.

[0108] The 90-degree peel test was performed using a peel test apparatus from Instron® (Instron, Norwood, Massachusetts).

[0109] A 19mm wide tape (Scotch brand, Magic Tape product) was used as the release tape, and a 2.5cm wide Nitto tape (Nitto P-02 double-sided tape) was used as the mounting tape.

[0110] After ensuring the tape adheres well to the insulating coating layer without wrinkles or bubbles using the pressure of a rubber roller, it was measured at a peeling speed of 80 mm / min.

[0111] The average of the measured values ​​for the three samples is listed in Table 2 below.

[0112]

[0113] Viscosity measurement

[0114] The viscosity of the aqueous slurry compositions according to the above Preparation Examples 1 to 23 was measured and listed in Table 2 below.

[0115] Viscosity was measured using an LV-61 Spindle from a Brookfield viscometer (DV Plus / Ametek Brookfield). The rpm was adjusted so that the torque value was approximately 70% based on a slurry temperature of 23±1℃, and the viscosity value was checked. At this time, the rpm can be 150 to 200.

[0116]

[0117] Example Composition (Weight%) Boehmite (0.15 μm) Binder SBR: Acrylamide-based (SP230) Water Dispersant ammonium acrylates copolymer Surfactant polyether-modified siloxane Wetting Agent PVA Weight% Binder Type Weight% Weight% Weight% Weight% Weight% Weight% 123.8 SBR 1.257 4.70.10.10.12 24.8 SP-2300 0.257 4.70.10.10.13 22.5 SP-2302.507 4.70.10.10.14 22.5 SP-2302.507 4.40.10.40.15 22.5 SP-2302.507 4.50.10.30.16 22.5 SP-2 302.5074.60.10.20.1724.3SP-2300.7574.70.10.10.1823.8SP-2301.2574.70.10.10.1923.5SP-2301.5074.70.10. 10.11023.3SP-2301.7574.70.10.10.11123.3SP-2301.7574.40.20.30.11223.0SP-2302.0074.70.10.10.11323.3SBR : SP-230= 3.0 : 7.01.7574.70.10.10.11423.3SBR : SP-230= 4.0 : 6.01.7574.70.10.10.11523.3SBR : SP-230= 2.0 : 8.01.7574.70.10.10.11623.3SBR : SP-230= 2.0 : 8.01.7574.40.20.30.11723.3SBR : SP-230= 2.0 : 8.01.7574.50.20.20.11823.3SBR : SP-230= 2.0:8.01.7574.60.20.10.11923.0SBR : SP-230= 2.0 : 8.02.0074.50.20.20.12022.8SBR : SP-230= 2.0 : 8.02.2574.40.30.20.12122.8SBR : SP-230= 2.0 : 8.02.2574.50.20.20.12222.7SBR : SP-230= 2.0 : 8.02.3174.40.30.20.12322.5SBR : SP-230= 2.0 : 8.02.5074.40.30.20.1

[0118]

[0119] Manufacturing Example Effect Adhesion Strength Adhesion Strength Viscosity (N / 18mm) (N / m) cp (23±1℃) 10.67 337 Less than 10 20.59 4333 Less than 10 31.00 755 Less than 10 42.33 5128 Less than 10 52.34 4129 Less than 10 62.42 4133 Less than 10 71.82 5100 Less than 10 82.13 8118 Less than 10 94.95 427 210 Less than 10 5.20 6286 Less than 10 115.113 281 Less than 110 125. 32129310less135.14328314.391145.42829914.221155.60530815.889167.40440716.335178.64447517.668189.58352717.159197.67642218.94208.747923.312218.55647121.468226.42635322.881235.9932923.43

Claims

1. A water-based solvent, styrene-butadiene rubber (SBR), and an acrylamide-based polymer, Water-based slurry composition.

2. In Paragraph 1, Based on the weight percentage of acrylamide-based polymers, the weight percentage of styrene-butadiene rubber (SBR) is 5% to 40% by weight, Water-based slurry composition.

3. In Paragraph 1, It further includes ceramic compounds, Based on the weight percentage of the ceramic compound, the total weight percentage of styrene-butadiene rubber (SBR) and acrylamide-based polymer is 1% to 20% by weight, Water-based slurry composition.

4. In Paragraph 1, It further includes ceramic compounds, The weight percentage of the ceramic compound is 15% to 30% by weight based on the total weight percentage of the aqueous slurry composition, Water-based slurry composition.

5. In Paragraph 1, It includes a silicone-containing surfactant, The weight percentage of the silicone-containing surfactant is 0.01% to 0.5% based on the total weight percentage of the aqueous slurry composition, Water-based slurry composition.

6. In Paragraph 1, A composition comprising at least one additionally selected from polyvinyl alcohol, polypropylene alcohol, polypropylene glycol, and polyethylene glycol. Water-based slurry composition.

7. In Paragraph 1, A dispersant further comprising an ammonium acrylate copolymer, Water-based slurry composition.

8. In Paragraph 1, A dispersant further comprising boehmite, a silicone-containing surfactant, polyvinyl alcohol, and an ammonium acrylate copolymer, Water-based slurry composition.

9. In Paragraph 1, The viscosity is 10 cp (23±1℃) to 100 cp (23±1℃), Water-based slurry composition.

10. A coating layer formed from an aqueous slurry composition according to claim 1, comprising Secondary battery.

11. In Paragraph 10, The above coating layer is included in part or all of the anode, Secondary battery.