Copolymer dispersant and dispersion using same

Abstract

The present invention relates to a copolymer containing two or more monomers selected from a monomer containing two or more substituted or unsubstituted aromatic rings, a monomer containing a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms, and a polar monomer containing any one selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O), and carboxylic acid (COOH), and a dispersion using the copolymer.

Description

[Technical Field]

[0001] The present invention relates to a copolymer dispersant and a dispersion using the same, and more particularly to a dispersant that can enhance the dispersibility of carbon materials, particularly carbon nanomaterials such as carbon nanotubes, even when used in small amounts, and a dispersion using the same. [Background technology]

[0002] Carbon materials have unique mechanical, electrical, and thermal properties, and are therefore used in a variety of fields, including electronics, biotechnology, and medicine. Recently, in addition to existing carbon materials such as graphite, activated carbon, and carbon black, carbon nanomaterials such as carbon nanotubes, fullerenes, and graphene have been attracting attention.

[0003] On the other hand, in order to use carbon materials efficiently, they must be effectively dispersed in matrices of various materials.

[0004] However, carbon materials, especially carbon nanomaterials, tend to aggregate within the matrix due to strong van der Waals forces, which can lead to problems such as a loss of uniformity and a loss of inherent properties.

[0005] Methods for dispersing carbon materials include mechanical dispersion using physical forces such as ultrasonic waves, milling, and high shear force, dispersion using a dispersant, and dispersion by surface modification.

[0006] However, mechanical dispersion and dispersion by surface modification are prone to damage the carbon material, which can significantly reduce the inherent properties of the carbon material (e.g., electrical conductivity, thermal conductivity, etc.).

[0007] Therefore, the dispersion of carbon materials using dispersants is being actively researched. In particular, in order to efficiently disperse carbon nanomaterials such as carbon nanotubes, intensive research is being conducted on wrapping carbon nanomaterials with polymer dispersants or utilizing π-π interactions between the p orbitals of the aromatic rings of polymer dispersants and the p orbitals of carbon nanomaterials.

[0008] However, there are still not many dispersants that can efficiently disperse carbon materials, especially carbon nanomaterials, while maintaining their inherent properties, and there is a need for research into this. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] U.S. Patent No. 7,655,708 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, an object of the present invention is to provide a dispersant that can efficiently disperse carbon materials (particularly carbon nanomaterials) even when used in small amounts.

[0011] The present invention also provides a dispersion using the dispersant.

[0012] However, the problems to be solved by the present application are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0013] One aspect of the present application is represented by the following formula 1: A copolymer is provided.

[0014] [ka]

[0015] In the above-mentioned Chemical Formula 1, R1 to R9 are each independently hydrogen or a linear or branched hydrocarbon having 1 to 4 carbon atoms; R'1 is a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms; R'2 contains two or more substituted or unsubstituted aromatic rings; R'3 is at least one selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O), and carboxylic acid (COOH); m and n each independently represent an integer of 0 to 4,000; Each 1 is an integer from 1 to 7,000. (However, if either m or n is 0, the other cannot be 0.)

[0016] Another aspect of the present application includes the copolymer: A dispersant is provided.

[0017] Yet another aspect of the present application is a composition comprising the dispersant and a solvent.

[0018] Yet another aspect of the present application provides a slurry composition for an electrode, an electrode, or a secondary battery, which includes the dispersant. [Effects of the Invention]

[0019] The copolymer according to the present invention has the effect of being able to efficiently disperse carbon materials (particularly carbon nanomaterials) in a small amount as a dispersant.

[0020] Furthermore, the dispersion using the dispersant of the present invention can be used in a variety of fields where dispersion of carbon materials is required (for example, electrodes of batteries and capacitors, etc.). DETAILED DESCRIPTION OF THE INVENTION

[0021] The functions and effects of the present invention will be described in more detail below through specific examples of the present invention, but these examples are presented only as examples of the present invention and do not define the scope of the invention.

[0022] Prior to this, the terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principle that an inventor can appropriately define the concept of a term in order to best describe his or her invention.

[0023] Therefore, it should be understood that the configuration of the embodiment described in this specification is merely one of the most preferred embodiments of the present invention and does not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can replace them at the time of this application.

[0024] In this specification, the singular includes the plural unless the context clearly indicates otherwise. It should be understood that in this specification, the terms "comprise," "comprise," or "have" are intended to specify the presence of embodied features, numbers, steps, components, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, components, or combinations thereof.

[0025] The copolymer according to one embodiment of the present invention is represented by the following formula 1. [ka] In the above-mentioned Chemical Formula 1, R1 to R9 are each independently hydrogen or a linear or branched hydrocarbon having 1 to 4 carbon atoms; R'1 is a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms; R'2 contains two or more substituted or unsubstituted aromatic rings; R'3 is at least one selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O), and carboxylic acid (COOH); m and n each independently represent an integer of 0 to 4,000; l is an integer from 1 to 7,000. (However, if either m or n is 0, the other cannot be 0.)

[0026] That is, the copolymer may be a copolymer containing two or more monomers selected from a monomer containing two or more substituted or unsubstituted aromatic rings, a monomer containing a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms, and a polar monomer containing one or more selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O), and carboxylic acid (COOH).

[0027] In one embodiment, R'1 in Chemical Formula 1 is n-pentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, n-undecyl, lauryl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, cetyl, n-hexadecyl, n-heptadecyl, stearyl, n-octyl, or 2-ethylhexyl. It may be any one or more selected from the group consisting of octadecyl, n-nonadecyl, n-icosyl, n-henicosyl, n-docosyl, iso-pentyl, iso-heptyl, iso-octyl, iso-nonyl, iso-decyl, iso-undecyl, iso-dodecyl, iso-tridecyl, iso-tetradecyl, iso-pentadecyl, iso-cetyl, iso-hexadecyl, iso-heptadecyl, iso-stearyl, iso-octadecyl, iso-nonadecyl, iso-icosyl, iso-henicosyl, and iso-docosyl.

[0028] That is, as the monomer containing R'1, only one type of monomer containing a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms may be used, or two or more types of monomers containing a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms may be used together.

[0029] Examples include a copolymer using only one of stearyl methacrylate and lauryl methacrylate, and a copolymer using both stearyl methacrylate and lauryl methacrylate.

[0030] The monomer containing a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms can wrap and disperse carbon materials (especially carbon nanomaterials such as carbon nanotubes) and reduce the viscosity of the dispersion.

[0031] If the linear or branched aliphatic hydrocarbon has less than 5 carbon atoms, it will not be able to sufficiently enclose the carbon material (especially the carbon nanotube), resulting in a decrease in dispersion power. If the carbon number exceeds 22, the compatibility with polar solvents such as NMP may be significantly reduced.

[0032] The content of the monomer containing a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms is 5 to 80 mol % based on 100 mol % of the total content of the entire copolymer.

[0033] If the content of the monomer containing the linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms is less than 5 mol%, the particle size and viscosity of the dispersion will increase, and if it exceeds 80 mol%, the compatibility with polar solvents will decrease and phase separation may occur.

[0034] In one embodiment, R'2 in Chemical Formula 1 may include at least one selected from the group consisting of benzyl, phenyl, phenoxy, naphthalene, anthracene, and pyrene, and may include at least one selected from the group consisting of, for example, 3-phenoxybenzyl, 1-naphthyl, 2-naphthyl, 9-anthracene methyl, and 1-pyrene methyl.

[0035] Alternatively, R'2 may be a substituted or unsubstituted hydrocarbon containing two or more aromatic rings.

[0036] Furthermore, as the monomer containing R'2, only one type of monomer containing two or more substituted or unsubstituted aromatic rings may be used, or two or more types of monomers containing two or more substituted or unsubstituted aromatic rings may be used together.

[0037] For example, when the aromatic ring is substituted, the substituent may be a linear or branched hydrocarbon having 1 to 4 carbon atoms, a substituent linked via oxygen (O) (for example, a substituted or unsubstituted aromatic ring linked via an ether), or the like.

[0038] In one embodiment, the monomer containing R'2 may be any one or more selected from the group consisting of 3-phenoxy benzyl acrylate and (1-pyrene) methyl 2-methyl-2-propenoate.

[0039] The monomer containing two or more substituted or unsubstituted aromatic rings plays a dispersing role through π-π interactions with carbon materials (especially carbon nanomaterials such as carbon nanotubes) and can be compatible with polar solvents such as NMP.

[0040] The substituted or unsubstituted monomer containing two or more aromatic rings is contained in an amount of 0 to 60 mol % based on 100 mol % of the total content of the entire copolymer.

[0041] When a monomer containing one aromatic ring is used, the dispersion effect decreases, and when the content of the substituted or unsubstituted monomer containing two or more aromatic rings exceeds 60 mol %, the content of aliphatic hydrocarbons and polar monomers decreases, increasing the viscosity of the dispersion and possibly increasing the particle size of the dispersed carbon material.

[0042] The polar monomer containing at least one selected from the group consisting of cyano (CN), pyrrolidone (NC4H6O), and carboxylic acid (COOH) can serve to impart compatibility with polar solvents such as NMP.

[0043] Examples include copolymers using only one of N-vinyl-2-pyrrolidone or acrylic acid, and copolymers using both N-vinyl-2-pyrrolidone and acrylic acid.

[0044] The polar monomer is contained in an amount of 0 to 60 mol % based on the total content of the entire copolymer (100 mol %).

[0045] If the polar monomer exceeds 60 mol % of the total copolymer, the compatibility with the polar solvent may become too high, resulting in phase separation after dispersion and increasing the particle size of the dispersed carbon material.

[0046] Even if the polar monomer is not used, compatibility with polar solvents can be achieved by using a monomer containing an aliphatic hydrocarbon having less than 13 carbon atoms and appropriately adjusting the ratio of the monomer containing two or more substituted or unsubstituted aromatic hydrocarbons.

[0047] In one embodiment, the copolymer may be a random or block copolymer depending on the synthesis process.

[0048] In one embodiment, the number average molecular weight of the copolymer may be 5,000 to 1,000,000.

[0049] If the number average molecular weight of the copolymer is less than 5,000, the fluidity of the dispersant increases, reducing its ability to prevent re-agglomeration of the carbon material, and if the number average molecular weight is more than 1,000,000, the viscosity may be too high for use.

[0050] A dispersant according to another aspect of the present application may contain the copolymer.

[0051] A dispersion according to yet another aspect of the present application can include the dispersant and a solvent.

[0052] In one embodiment, the solvent may be a polar solvent, such as any one or more selected from the group consisting of N-methyl-2-pyrrolidone (NMP), N-ethyl-2-pyrrolidone (NEP), dimethylformamide (DMF), dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), and γ-butyrolactone.

[0053] In one embodiment, the dispersion liquid may further include a carbon material, which may be, but is not limited to, any one or more selected from the group consisting of graphite, activated carbon, carbon black, carbon nanotubes, fullerenes, and graphene.

[0054] The carbon nanotubes may be single-walled carbon nanotubes, multi-walled carbon nanotubes, or a combination thereof.

[0055] In one embodiment, when the dispersion contains 1.5 wt% solids, the viscosity of the dispersion may be 3,300 to 18,000 cps, and the average particle size (D50) of the single-walled carbon nanotubes, the multi-walled carbon nanotubes, or a combination thereof dispersed in the dispersion may be 10 μm or less.

[0056] The slurry composition according to another aspect of the present disclosure may include the dispersant. The slurry composition may be a slurry for an electrode and may include an electrode active material, a binder, a solvent, and the like.

[0057] For example, among the electrode active materials, lithium-containing complex metal compounds containing at least one selected from the group consisting of Co, Ni, Mn, and Al; transition metal sulfides such as TiS2, TiS3, and amorphous MoS3; Cu2V2O3, amorphous VO-P2O5, MoO3, VO5, and VO 13 Transition metal oxides such as the above can be used.

[0058] Examples of negative electrode active materials include carbonaceous materials such as silicon-based active materials, tin-based active materials, amorphous carbon, graphite, natural graphite, mesocarbon microbeads (MCMB), and pitch-based carbon fibers, and conductive polymers such as polyacenes.

[0059] Examples of the silicon-based active material include silicon oxide, silicon carbon composite, and silicon alloy.

[0060] The binder may be at least one selected from the group consisting of poly(meth)acrylic acid, poly(meth)acrylamide, carboxymethyl cellulose, polyvinylidene fluoride, polyhexafluoropropylene-polyvinylidene fluoride copolymer (P(VdF / HFP)), poly(vinyl acetate), polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, alkylated polyethylene oxide, polyvinyl ether, poly(methyl methacrylate), poly(ethyl acrylate), polytetrafluoroethylene, polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, styrene-butadiene rubber, acrylonitrile-butadiene rubber, and copolymers thereof.

[0061] Meanwhile, the slurry composition may further include a conductive material. The conductive material is not particularly limited and can be appropriately selected depending on the type of battery or capacitor. For example, in the case of a lithium-ion secondary battery, carbon such as graphite or activated carbon is used, and in the case of a nickel-metal hydride secondary battery, cobalt oxide is used for the negative electrode, and nickel powder, cobalt oxide, titanium oxide, carbon, etc. can be used for the negative electrode.

[0062] Examples of the carbon include acetylene black, furnace black, graphite, carbon fiber, and fullerenes.

[0063] The amount of the conductive material used is usually 1 to 20 parts by weight, preferably 2 to 10 parts by weight, based on 100 parts by weight of the electrode active material.

[0064] If necessary, a viscosity modifier, a fluidizing agent, etc. may be further added to the electrode slurry composition.

[0065] According to yet another aspect of the present application, an electrode can include the dispersant. The electrode can be, but is not limited to, a positive electrode or a negative electrode of a primary battery, a secondary battery, a capacitor, a fuel cell, or the like. [Example]

[0066] The present invention will be described in more detail below using examples, but the present invention is not limited thereto.

[0067] [Example 1] A five-neck flask reactor was charged with 45.2g of 3-phenoxybenzyl acrylate, 45.2g of stearyl methacrylate, 9.6g of acrylic acid, and 209.1g of N-methylpyrrolidone. A reflux condenser and thermometer were attached, and the temperature was raised to 65°C while nitrogen gas was introduced. Once the mixture reached 65°C, 0.25g of 2,2'-azobis-2,4-dimethylvaleronitrile (V-65) was dissolved in 24.84g of N-methylpyrrolidone and added dropwise over 30 minutes. After the addition was complete, the temperature was maintained at 65°C for 7 hours, and then 0.12g of 2,2'-azobis-2,4-dimethylvaleronitrile (V-65) was dissolved in 12g of N-methylpyrrolidone and added. The temperature was maintained at 90°C for 3 hours to synthesize a dispersant with a solids content of 30%.

[0068] 0.26 g of the synthesized dispersant, 1.24 g of multi-walled carbon nanotubes (diameter 10 nm, length 150 μm), 98.5 g of N-methylpyrrolidone, and 200 g of 0.65 mm zirconia beads were placed in a planetary ball mill and dispersed at 400 rpm for 30 minutes to prepare a dispersion.

[0069] [Example 2] Synthesis and dispersion were prepared in the same manner as in Example 1, except that 37.4 g of (1-pyrene)methyl 2-methyl-2-propenoate was used instead of 3-phenoxybenzyl acrylate, 55.1 g of lauryl methacrylate was used instead of stearyl methacrylate, and 7.5 g of methacrylic acid was used instead of acrylic acid.

[0070] [Example 3] A dispersion was prepared by synthesis in the same manner as in Example 1, except that 3-phenoxybenzyl acrylate was not used, and 82.5 g of stearyl methacrylate and 17.5 g of acrylic acid were used.

[0071] [Example 4] Synthesis was carried out in the same manner as in Example 1, except that acrylic acid was not used, and 50 g of 3-phenoxybenzyl acrylate and 50 g of lauryl methacrylate were used instead of stearyl methacrylate, to prepare a dispersion.

[0072] [Comparative Example 1] Synthesis was carried out in the same manner as in Example 1, except that 36.4 g of benzyl methacrylate, 52.4 g of stearyl methacrylate, and 11.2 g of acrylic acid were used instead of 3-phenoxybenzyl acrylate, and a dispersion was prepared.

[0073] Comparative Example 2 Synthesis was carried out in the same manner as in Example 1, except that 62.9 g of 3-phenoxybenzyl acrylate, 23.7 g of butyl acrylate instead of stearyl methacrylate, and 13.4 g of acrylic acid were used, to prepare a dispersion.

[0074] Comparative Example 3 A dispersion was prepared by synthesizing in the same manner as in Example 1, except that 376.2 g of N-methylpyrrolidone was used instead of 209.1 g and the initial reaction temperature was 90°C instead of 65°C.

[0075] Comparative Example 4 A dispersion was prepared by synthesizing in the same manner as in Example 1, except that 42 g of N-methylpyrrolidone was used instead of 209.1 g, the initial reaction temperature was 60°C instead of 65°C, and the reaction time was 12 hours instead of 7 hours.

[0076] Comparative Example 5 A dispersion was prepared by the method of Example 1 using hydrogenated nitrile butadiene rubber having a number average molecular weight of 70,000 as the dispersant.

[0077] The specific compositions of the dispersants, the contents of NMP, and the reaction conditions of the dispersions of Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1 below.

[0078] [Table 1] In Table 1, PBA represents 3-phenoxybenzyl acrylate, SMA represents stearyl methacrylate, AA represents acrylic acid, pyMMP represents (1-pyrene)methyl 2-methyl-2-propenoate, LMA represents lauryl methacrylate, MAA represents methacrylic acid, BMA represents benzyl methacrylate, and BA represents butyl acrylate.

[0079] [Experimental Example] The number average molecular weights of the dispersants in Examples 1 to 4 and Comparative Examples 1 to 5 were measured by GPC.

[0080] Furthermore, the solubility in NMP was evaluated by dissolving the dispersants of Examples 1 to 4 and Comparative Examples 1 to 5 in NMP, storing them at 25°C for 24 hours, and determining whether or not phase separation occurred. If phase separation occurred, the result was marked with "X," and if no phase separation occurred, the result was marked with "O."

[0081] On the other hand, the viscosity of the dispersions of Examples 1 to 4 and Comparative Examples 1 to 5 was measured using a rheometer and expressed as the viscosity at a shear rate of 10. The particle size was measured using a Mastersizer 3000 (manufacturer: Malvern Panalytical) and expressed as the D50 particle size.

[0082] The measured number average molecular weights of the dispersants of Examples 1 to 4 and Comparative Examples 1 to 5, the solubility in NMP, the viscosity of the dispersions, and the particle size of the carbon nanotubes dispersed in the dispersions are shown in Table 2 below.

[0083] [Table 2]

[0084] In the case of Comparative Example 1, in which a monomer containing only one aromatic ring (benzyl methacrylate) was used, it was confirmed that the carbon nanotubes were not dispersed sufficiently and the particle size of the carbon nanotubes was much larger than in Examples 1 to 4.

[0085] In addition, in the case of Comparative Example 2, in which butyl acrylate substituted with an alkyl having less than 5 carbon atoms in the aliphatic hydrocarbon was used, it was confirmed that not only was the particle size of the carbon nanotubes significantly larger than in Examples 1 to 4, but the viscosity of the dispersion was also significantly higher.

[0086] On the other hand, among Comparative Examples 3 and 4 in which the number average molecular weight was adjusted, Comparative Example 3, which had a low number average molecular weight of 3,506, did not dissolve well in NMP and underwent phase separation, resulting in insufficient dispersion of the carbon nanotubes and a much larger particle size of the carbon nanotubes compared to Examples 1 to 4.

[0087] Furthermore, it was confirmed that Comparative Example 4, which had a high number average molecular weight of 1,050,005, had a dispersion with a much higher viscosity than Examples 1 to 4.

[0088] In Comparative Example 5, in which an existing dispersant other than a copolymer dispersant was used, it was confirmed that the carbon nanotubes were not sufficiently dispersed compared to Examples 1 to 4, resulting in larger particle sizes of the carbon nanotubes.

[0089] That is, the dispersions of Examples 1 to 4 were superior to the dispersions of Comparative Examples 1 to 5 in at least one aspect of viscosity and particle size of carbon nanotubes.

[0090] The dispersions of Examples 1 to 4 are expected to have excellent dispersion effects even when used in relatively small amounts in various fields where dispersion of carbon materials is required due to the appropriate balance of viscosity and particle size of carbon nanotubes.

[0091] The scope of the present invention is indicated by the claims that follow rather than by the above detailed description, and all modifications and variations that fall within the meaning and scope of the claims and their equivalents should be interpreted as being included within the scope of the present invention. [Industrial Applicability]

[0092] The copolymer according to the present invention has the effect of being able to efficiently disperse carbon materials (particularly carbon nanomaterials) in a small amount as a dispersant.

[0093] Furthermore, the dispersion using the dispersant of the present invention can be used in a variety of fields where dispersion of carbon materials is required (for example, electrodes of batteries and capacitors, etc.).

Claims

1. It is represented by the following formula 1: The number average molecular weight of the copolymer is 5,000 to 1,000,000. Copolymer. 【Chemistry 1】 In the above-mentioned Chemical Formula 1, R 1 ~R 9 are each independently selected from the group consisting of hydrogen and linear or branched hydrocarbons having 1 to 4 carbon atoms; R' 1 is a linear or branched aliphatic hydrocarbon having 5 to 22 carbon atoms, R' 2 contains two or more substituted or unsubstituted aromatic rings, R' 3 is a carboxylic acid (COOH), m and n each independently represent an integer from 1 to 4,000; l is an integer from 1 to 7,000.

2. R' 1 is n-pentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, n-undecyl, lauryl, n-dodecyl, n-tridecyl, n-tetradecyl, n-pentadecyl, cetyl, n-hexadecyl, n-heptadecyl, stearyl, n-octadecyl, n-nonadecyl, n-icosyl, n-henicosyl, n-docosyl, iso-pentyl, iso-heptyl, iso-o any one or more selected from the group consisting of octyl, iso-nonyl, iso-decyl, iso-undecyl, iso-dodecyl, iso-tridecyl, iso-tetradecyl, iso-pentadecyl, iso-cetyl, iso-hexadecyl, iso-heptadecyl, iso-stearyl, iso-octadecyl, iso-nonadecyl, iso-icosyl, iso-heneicosyl, and iso-docosyl; The copolymer of claim 1.

3. R' 2 includes one or more selected from the group consisting of substituted or unsubstituted benzyl, phenyl, phenoxy, naphthalene, anthracene, and pyrene; The copolymer of claim 1.

4. R' 2 includes at least one selected from the group consisting of 3-phenoxybenzyl, 1-naphthyl, 2-naphthyl, 9-anthracenylmethyl, and 1-pyrenemethyl, The copolymer of claim 1.

5. R' 2 is at least one selected from the group consisting of 3-phenoxybenzyl acrylate and (1-pyrene) methyl 2-methyl-2-propenoate; The copolymer of claim 1.

6. The copolymer is a random or block copolymer. The copolymer of claim 1.

7. The copolymer according to any one of claims 1 to 6, Dispersant.

8. The dispersant of claim 7; a solvent, dispersion liquid.

9. The solvent is at least one selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethylformamide, dimethylacetamide, dimethylsulfoxide, and γ-butyrolactone; The dispersion of claim 8.

10. It additionally contains a carbon material. The dispersion of claim 8.

11. The carbon material is at least one selected from the group consisting of graphite, activated carbon, carbon black, single-walled carbon nanotubes, multi-walled carbon nanotubes, fullerenes, and graphene. The dispersion of claim 10.

12. the average particle size (D50) of the single-walled carbon nanotubes, the multi-walled carbon nanotubes, or a combination thereof dispersed in the dispersion liquid is 10 μm or less; The dispersion of claim 11.

13. 8. A dispersant comprising the dispersant of claim 7. Slurry composition for electrodes.

14. 8. A dispersant comprising the dispersant of claim 7. electrode.

15. 8. A dispersant comprising the dispersant of claim 7. Secondary battery.

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